National Library of Energy BETA

Sample records for imperial sand dunes

  1. Moving sand dunes

    E-Print Network [OSTI]

    Sparavigna, Amelia Carolina

    2011-01-01

    In several desert areas, the slow motion of sand dunes can be a challenge for modern human activities and a threat for the survival of ancient places or archaeological sites. However, several methods exist for surveying the dune fields and estimate their migration rate. Among these methods, the use of satellite images, in particular of those freely available on the World Wide Web, is a convenient resource for the planning of future human settlements and activities.

  2. Minimal Model for Sand Dunes

    E-Print Network [OSTI]

    Klaus Kroy; Gerd Sauermann; Hans J. Herrmann

    2002-03-02

    We propose a minimal model for aeolian sand dunes. It combines an analytical description of the turbulent wind velocity field above the dune with a continuum saltation model that allows for saturation transients in the sand flux. The model provides a qualitative understanding of important features of real dunes, such as their longitudinal shape and aspect ratio, the formation of a slip face, the breaking of scale invariance, and the existence of a minimum dune size.

  3. Mineral resources of the North Algodones Dunes Wilderness Study Area (CDCA-360), Imperial County, California

    SciTech Connect (OSTI)

    Smith, R.S.U.; Yeend, W.; Dohrenwend, J.C.; Gese, D.D.

    1984-01-01

    This report presents the results of a mineral survey of the North Algodones Dunes Wilderness Study Area (CDCA-360), California Desert Conservation Area, Imperial County, California. The potential for undiscovered base and precious metals, and sand and gravel within the North Algodones Dunes Wilderness Study Area is low. The study area has a moderate potential for geothermal energy. One small sand-free area between the Coachella Canal and the west edge of the dune field would probably be the only feasible exploration site for geothermal energy. The study area has a moderate to high potential for the occurrence of undiscovered gas/condensate within the underlying rocks. 21 refs.

  4. Sand Ripples and Dunes Francois Charru,1

    E-Print Network [OSTI]

    Claudin, Philippe

    Sand Ripples and Dunes Franc¸ois Charru,1 Bruno Andreotti,2 and Philippe Claudin2 1 Institut de M qsat f H p d BarchanTransverse Water Air Figure 1 Migration velocity c of dunes as a function of their height H for aeolian barchan dunes ( filled circles), dunes propagating on the back of large aeolian

  5. Biogenic crust dynamics on sand dunes

    E-Print Network [OSTI]

    Kinast, Shai; Yizhaq, Hezi; Ashkenazy, Yosef

    2012-01-01

    Sand dunes are often covered by vegetation and biogenic crusts. Despite their significant role in dune stabilization, biogenic crusts have rarely been considered in studies of dune dynamics. Using a simple model, we study the existence and stability ranges of different dune-cover states along gradients of rainfall and wind power. Two ranges of alternative stable states are identified: fixed crusted dunes and fixed vegetated dunes at low wind power, and fixed vegetated dunes and active dunes at high wind power. These results suggest a cross-over between two different forms of desertification.

  6. Minimal model for aeolian sand dunes

    E-Print Network [OSTI]

    Klaus Kroy; Gerd Sauermann; Hans J. Herrmann

    2002-03-02

    We present a minimal model for the formation and migration of aeolian sand dunes. It combines a perturbative description of the turbulent wind velocity field above the dune with a continuum saltation model that allows for saturation transients in the sand flux. The latter are shown to provide the characteristic length scale. The model can explain the origin of important features of dunes, such as the formation of a slip face, the broken scale invariance, and the existence of a minimum dune size. It also predicts the longitudinal shape and aspect ratio of dunes and heaps, their migration velocity and shape relaxation dynamics. Although the minimal model employs non-local expressions for the wind shear stress as well as for the sand flux, it is simple enough to serve as a very efficient tool for analytical and numerical investigations and to open up the way to simulations of large scale desert topographies.

  7. Long-time evolution of models of aeolian sand dune fields: Influence of dune formation and collision

    E-Print Network [OSTI]

    Glasner, Karl B.

    Long-time evolution of models of aeolian sand dune fields: Influence of dune formation December 2008 Accepted 6 February 2009 Available online xxxx Keywords: Sand dune Dune field Dune field model Dune collision Coarsening Coalescence Theoretical models which approximate individual sand dunes

  8. Dating of Sand Dunes Using Cosmogenic Chlorine-36: An Example From the Nebraska Sand Hills, USA

    E-Print Network [OSTI]

    Zreda, Marek

    Dating of Sand Dunes Using Cosmogenic Chlorine-36: An Example From the Nebraska Sand Hills, USA Stephen Moysey, Marek Zreda and Jim Goeke The large-scale mobility of sand dunes in continental dune of the history of a dune field can therefore, provide a proxy climate record derived from the continental plains

  9. Author's personal copy Long-time evolution of models of aeolian sand dune elds: In uence of dune

    E-Print Network [OSTI]

    Byrne, Shane

    Author's personal copy Long-time evolution of models of aeolian sand dune elds: In uence of dune December 2008 Accepted 6 February 2009 Available online 20 February 2009 Keywords: Sand dune Dune eld Dune eld model Dune collision Coarsening Coalescence Theoretical models which approximate individual sand

  10. Ecology of Pacific Northwest coastal sand dunes: a community profile

    SciTech Connect (OSTI)

    Wiedemann, A.M.

    1984-03-01

    Sand dunes occur in 33 localities along the 950 km of North American Pacific coast between the Straits of Juan de Fuca (49/sup 0/N) and Cape Mendocino (40/sup 0/). The dune landscape is a mosaic of dune forms: transverse ridge, oblique dune, retention ridge, foredune, parabola dune, sand hummock, blowout, sand plain, deflation plain, dune ridge, swale, remnant forest, and ponds and lakes. These forms are the basic morphological units making up the four dune systems: parallel ridge, parabola dune, transverse ridge, and bay dune. Vegetation is well-developed on stabilized dunes. Of the 21 plant communities identified, nine are herbaceous, five are shrub, and seven are forest. A wide variety of vertebrate animals occur in seven distinct habitats: open dunes, grassland and meadow, shrub thicket, forest, marsh, riparian, and lakes and ponds. Urban development, increased rate of stabilization due to the introduction of European beachgrass (Ammophila arenaria (L.) Link), and massive disturbance resulting from heavy off-road vehicle traffic are the greatest threats to the long-term survival and stability of a number of sand dune habitats. Two animals and three plants dependent on dune habitats are listed as rare, threatened, or endangered. 93 references, 52 figures, 13 tables.

  11. Boundary processes between a desert sand dune community and an encroaching suburban landscape

    E-Print Network [OSTI]

    Barrows, Cameron W.; Allen, M F; Rotenberry, J T

    2006-01-01

    biology of the Namib dune lizard, Aporosaura anchietae,energetics of a Namib Desert dune ecosystem. Journal of Aridbetween a desert sand dune community and an encroaching

  12. The effects of psammophilous plants on sand dune dynamics

    E-Print Network [OSTI]

    Bel, Golan

    2013-01-01

    Psammophilous plants are special plants that flourish in sand moving environments. There are two main mechanisms by which the wind affects these plants: (i) sand drift exposes roots and covers branches--the exposed roots turn into new plants and the covered branches turn into new roots; both mechanisms result in an enhanced growth rate of the psammophilous plant cover of the dunes; (ii) strong winds, often associated with sand movement, tear branches and seed them in nearby locations, resulting in new plants and an enhanced growth rate of the psammophilous plant cover of the dunes. Despite their important role in dune dynamics, to our knowledge, psammophilous plants have never been incorporated into mathematical models of sand dunes. Here, we attempt to model the effects of these plants on sand dune dynamics. We construct a set of three ordinary differential equations for the fractions of surface cover of regular vegetation, biogenic soil crust and psammophilous plants. The latter reach their optimal growth u...

  13. The effects of psammophilous plants on sand dune dynamics

    E-Print Network [OSTI]

    Golan Bel; Yosef Ashkenazy

    2013-08-30

    Psammophilous plants are special plants that flourish in sand moving environments. There are two main mechanisms by which the wind affects these plants: (i) sand drift exposes roots and covers branches--the exposed roots turn into new plants and the covered branches turn into new roots; both mechanisms result in an enhanced growth rate of the psammophilous plant cover of the dunes; (ii) strong winds, often associated with sand movement, tear branches and seed them in nearby locations, resulting in new plants and an enhanced growth rate of the psammophilous plant cover of the dunes. Despite their important role in dune dynamics, to our knowledge, psammophilous plants have never been incorporated into mathematical models of sand dunes. Here, we attempt to model the effects of these plants on sand dune dynamics. We construct a set of three ordinary differential equations for the fractions of surface cover of regular vegetation, biogenic soil crust and psammophilous plants. The latter reach their optimal growth under (i) specific sand drift or (ii) specific wind power. We show that psammophilous plants enrich the sand dune dynamics. Depending on the climatological conditions, it is possible to obtain one, two, or three steady dune states. The activity of the dunes can be associated with the surface cover--bare dunes are active, and dunes with significant cover of vegetation, biogenic soil crust, or psammophilous plants are fixed. Our model shows that under suitable precipitation rates and wind power, the dynamics of the different cover types is in accordance with the common view that dunes are initially stabilized by psammophilous plants that reduce sand activity, thus enhancing the growth of regular vegetation that eventually dominates the cover of the dunes and determines their activity.

  14. Great Kobuk Sand Dunes, Alaska: A Terrestrial Analog Site for Polar, Topographically Confined Martian Dune Fields

    E-Print Network [OSTI]

    Stillman, David E.

    P13B-1369 Great Kobuk Sand Dunes, Alaska: A Terrestrial Analog Site for Polar, Topographically Confined Martian Dune Fields Dinwiddie, C. L.1 ; D. M. Hooper1 ; T. I. Michaels2 ; R. N. Mcginnis1 ; D and Engineering Laboratory, U.S. Army Corps of Engineers, Ft. Wainwright, AK, United States. Martian dune systems

  15. Biogenic crust dynamics on sand dunes Shai Kinast,1

    E-Print Network [OSTI]

    Ashkenazy, Yossi "Yosef"

    different forms of desertification. Sand dunes have been the subject of active research for many years these questions is signifi- cant for understanding desertification processes, i.e. pro- cesses involving

  16. Mechanism of acoustic emissions from booming sand dunes

    E-Print Network [OSTI]

    Zhen-Ting Wang

    2013-05-10

    The classical elastic mechanics shows that the fundamental frequency of a sand grain chain is similar to the typical frequency of acoustic emission generated by the booming dunes. The "song of dunes" is therefore considered to originate from the resonance of grain chains occurring within a solid layer only several centimeters thick.

  17. The Great Sand Dunes Ecosystem Elk and Bison Carrying Capacity Model: Description and Scenario Results

    E-Print Network [OSTI]

    Boone, Randall B.

    1 The Great Sand Dunes Ecosystem Elk and Bison Carrying Capacity Model: Description and Scenario studying the Sand Dunes ecosystem in the past decade. The information they have gathered has been.S. Geological Survey, and Great Sand Dunes National Park and Preserve for providing funding to support

  18. Comment on ``Solving the mystery of booming sand dunes'' by Nathalie M. Vriend et al.

    E-Print Network [OSTI]

    Clayton, Robert W.

    Comment on ``Solving the mystery of booming sand dunes'' by Nathalie M. Vriend et al. B. Andreotti), Comment on ``Solving the mystery of booming sand dunes'' by Nathalie M. Vriend et al., Geophys. Res. Lett, does not apply to the surface layer of sand dunes. According to several experi- mental, theoretical

  19. Wind profiles on the stoss slope of sand dunes: Implications for eolian sand transport

    SciTech Connect (OSTI)

    Frank, A.; Kocurek, G. (Univ. of Texas, Austin, TX (United States). Dept. of Geological Sciences)

    1993-04-01

    Starting with the work of R.A. Bagnold it has been recognized that the shear stress exerted by the wind on sand grains is the driving force for eolian sand transport. Calculation of accurate rates of sand transport is essential for prediction of migration rates of sand dunes in modern environments as well as reconstructing paleoclimates (wind speed and direction) from eolian deposits. Because a sand dune is a streamlined obstacle in the path of the wind, continuity necessitates that the flow field is compressed over the windward side of a dune and shear stress should progressively increase up the slope as the flow accelerates. However, airflow measurements over 14 dunes (at White Sands, New Mexico; Algodones, CA; and Padre Island, TX) show that compression of the flow field occurs very close to the surface and as a consequence, the overlying flow actually shows an overall decrease in shear stress up the slope. Measurements commonly collected in the overlying zone are not representative of the near-surface, sand-driving wind. Furthermore, near-surface compression of the flow field implies that a pressure gradient exists that would render the current transport models inappropriate for sloping surfaces that dominate natural sandy desert terrains.

  20. Dynamics of unusual debris flows on Martian sand dunes Hideaki Miyamoto,1,2

    E-Print Network [OSTI]

    Bourke, Mary C.

    Dynamics of unusual debris flows on Martian sand dunes Hideaki Miyamoto,1,2 James M. Dohm,3 Victor 9 June 2004; published 8 July 2004. [1] Gullies that dissect sand dunes in Russell impact crater a surface layer of interstitial ice within the dune deposits to several centimeters depth. INDEX TERMS: 1824

  1. Sand dune dynamics and climate change: A modeling H. Yizhaq,1

    E-Print Network [OSTI]

    Ashkenazy, Yossi "Yosef"

    Sand dune dynamics and climate change: A modeling approach H. Yizhaq,1 Y. Ashkenazy,1 and H. Tsoar2] We provide several examples for the coexistence of active and fixed sand dunes under similar climatic conditions, namely, with respect to wind power and precipitation rate. A model is developed for dune

  2. Reply to comment by B. Andreotti et al. on ``Solving the mystery of booming sand dunes''

    E-Print Network [OSTI]

    Clayton, Robert W.

    Reply to comment by B. Andreotti et al. on ``Solving the mystery of booming sand dunes'' Nathalie M to comment by B. Andreotti et al. on ``Solving the mystery of booming sand dunes,'' Geophys. Res. Lett., 35]. The waveguide model still holds in the dune for the observed velocities, even with a velocity increase

  3. A comparison of methods used to estimate the height of sand dunes on Mars

    E-Print Network [OSTI]

    Bourke, Mary C.

    A comparison of methods used to estimate the height of sand dunes on Mars M.C. Bourke a,b,, M bodies is difficult. We assess four methods that can be used to estimate the height of aeolian dunes of which were not previously available for dunes on Mars. They include dune height, width, length, surface

  4. A COMPARATIVE ANALYSIS OF BARCHAN DUNES IN THE INTRA-CRATER DUNE FIELDS AND THE NORTH POLAR SAND SEA. M.C. Bourke1

    E-Print Network [OSTI]

    Bourke, Mary C.

    A COMPARATIVE ANALYSIS OF BARCHAN DUNES IN THE INTRA-CRATER DUNE FIELDS AND THE NORTH POLAR SAND@nasm.si.edu. Introduction: Martian sand dunes have the poten- tial to contribute data on geological history through a study of their form. Recognition of the characteristics of both recent and ancient dunes is the first step to- wards

  5. Comment on "Solving the mystery of booming sand dunes"

    E-Print Network [OSTI]

    B. Andreotti; L. Bonneau; E. Clement

    2007-10-30

    We show here that the standard physical model used by Vriend et al. to analyse seismograph data, namely a non-dispersive bulk propagation, does not apply to the surface layer of sand dunes. According to several experimental, theoretical and field results, the only possible propagation of sound waves in a dry sand bed under gravity is through an infinite, yet discrete, number of dispersive surface modes. Besides, we present a series of evidences, most of which have already been published in the literature, that the frequency of booming avalanches is not controlled by any resonance as argued in this article. In particular, plotting the data provided by Vriend et al. as a table, it turns out that they do not present any correlation between the booming frequency and their estimate of the resonant frequency.

  6. Morphodynamics of small-scale superimposed sand waves over migrating dune bed forms

    E-Print Network [OSTI]

    Venditti, Jeremy G.

    Morphodynamics of small-scale superimposed sand waves over migrating dune bed forms Jeremy G migrating dunes are examined using data drawn from laboratory experiments. We refer to the superimposed classified as ripples, dunes, or bars. Within the experiments, the sheets formed downstream

  7. Solving the mystery of booming sand dunes Nathalie M. Vriend,1

    E-Print Network [OSTI]

    Clayton, Robert W.

    Solving the mystery of booming sand dunes Nathalie M. Vriend,1 Melany L. Hunt,1 Robert W. Clayton,2 of a large dune. The sound is remarkable because it is composed of one dominant audible frequency (70 to 105 Hz) plus several higher harmonics. This study challenges earlier reports that the dunes' frequency

  8. Geospatial analysis of a coastal sand dune field evolution: Jockey's Ridge, North Carolina

    E-Print Network [OSTI]

    Mitasova, Helena

    Geospatial analysis of a coastal sand dune field evolution: Jockey's Ridge, North Carolina Helena to the Jockey's Ridge, North Carolina, the largest active dune field on the east coast of the United States, lidar and GPS point data were used to compute a multitemporal elevation model of the dune field

  9. INITIATION AND DEVELOPMENT OF SAND DUNES IN RIVER CHANNELS Jeremy George Venditti

    E-Print Network [OSTI]

    Venditti, Jeremy G.

    INITIATION AND DEVELOPMENT OF SAND DUNES IN RIVER CHANNELS by Jeremy George Venditti B in the experiments. The 2D bedforms initiated by the Kelvin-Helmholtz instability developed into dune features that grew exponentially towards equilibrium dimensions. Dune heights and lengths increased with flow

  10. Species Diversity of Seed-Eating Desert Rodents in Sand Dune Habitats Author(s): James H. Brown

    E-Print Network [OSTI]

    Brown, James H.

    Species Diversity of Seed-Eating Desert Rodents in Sand Dune Habitats Author(s): James H. Brown DIVERSITY OF SEED-EATING DESERT RODENTS IN SAND DUNE HABITATS' JAMES H. BROWN Department of Biology, University of Utah, Salt Lake City 84112 Abstract.The seed-eatingrodent faunas were sampled on 18 dunes

  11. Viscous sublayer code Supplementary material to the paper `Sand ripples and dunes', Annu. Rev. Fluid Mech. 45

    E-Print Network [OSTI]

    Claudin, Philippe

    Viscous sublayer code Supplementary material to the paper `Sand ripples and dunes', Annu. Rev and Dunes Charru, Andreotti, and Claudin #12;2 Linearised equations For small enough amplitudes, we can

  12. Sand transverse dune aerodynamics: 3D Coherent Flow Structures from a computational study

    E-Print Network [OSTI]

    Bruno, Luca

    2015-01-01

    The engineering interest about dune fields is dictated by the their interaction with a number of human infrastructures in arid environments. The aerodynamic behaviour of sand dunes in atmospheric boundary layer belongs to the class of bluff bodies. Because of their simple geometry and their frequent occurrence in desert area, transverse sand dunes are usually adopted in literature as a benchmark to investigate dune aerodynamics by means of both computational or experimental approach, usually in nominally 2D setups. The writers suspect the flow in the wake is characterised by 3D features and affected by wind tunnel setup - e.g. blockage effect, duct side wall boundary layer, incoming velocity profile - when experimental studies are carried out. The present study aims at evaluating the 3D flow features of an idealised transverse dune under different setup conditions by means of computational simulations and to compare the obtained results with experimental measurements.

  13. Dune-dammed lakes of the Nebraska Sand Hills: Geologic setting and paleoclimatic implications

    SciTech Connect (OSTI)

    Loope, D.B.; Swinehart, J.B. (Univ. of Nebraska, Lincoln, NE (United States))

    1992-01-01

    Within the western half of this grass-stabilized dunefield, about 1,000 interdune lakes are grouped into two clusters here named the Blue and Birdwood lake basins. In the lake basins, those parts of the valley not filled by dune sand are occupied by modern lakes and Holocene lake sediments. The Blue Creek dam is mounded transverse to flow; spill-over of the lake basin takes place over bedrock on the east side of the dam when lake level is 2 m higher than present. The permeability of dune sand prevents massive overflow, and thereby contributes to the integrity and longevity of the dam. Preserved lake sediments in the basin indicate that Blue Creek was obstructed prior to 13,000 yr BP, probably during glacial maximum (18,000 yr BP). Extensive peats dated at 1,500-1,000 yr BP lie directly on fluvial sand and gravel along the Calamus River, a stream that presently discharges a nearly constant 350 cfs. These sediments indicate blockage of streams also took place when linear dunes were active in the eastern Sand Hills in Late Holocene time. With the onset of an arid episode, dunes forming an interfluves curtail the severity of runoff events. As the regional water table drops, drainages go dry and dunes move uncontested into blocking positions. Although drainages of the eastern Sand Hills appear to have repeatedly broken through sand-blocked channels, the Blue and Birdwood lake basins are still blocked by Late Pleistocene dune dams. The repeated episodes of stream blockage and interbedded lake sediments and dune sands behind the extant dams record several strong fluctuations in Holocene climate. Recently proposed climatic models indicate that the northward flow of warm, moist air from the Gulf of Mexico is enhanced when the Gulf's surface temperature is low and the Bermuda high is intensified and in a western position. When the Bermuda high moves eastward, the core of the North American continent becomes desiccated.

  14. Global Sea Level Stabilization-Sand Dune Fixation: A Solar-powered Sahara Seawater Textile Pipeline

    E-Print Network [OSTI]

    Badescu, Viorel; Bolonkin, Alexander A

    2007-01-01

    Could anthropogenic saturation with pumped seawater of the porous ground of active sand dune fields in major deserts (e.g., the westernmost Sahara) cause a beneficial reduction of global sea level? Seawater extraction from the ocean, and its deposition on deserted sand dune fields in Mauritania and elsewhere via a Solar-powered Seawater Textile Pipeline (SSTP) can thwart the postulated future global sea level. Thus, Macro-engineering offers an additional cure for anticipated coastal change, driven by global sea level rise, that could supplement, or substitute for (1) stabilizing the shoreline with costly defensive public works (armoring macroprojects) and (2) permanent retreat from the existing shoreline (real and capital property abandonment). We propose Macro-engineering use tactical technologies that sculpt and vegetate barren near-coast sand dune fields with seawater, seawater that would otherwise, as commonly postulated, enlarge Earth seascape area! Our Macro-engineering speculation blends eremology with...

  15. Insights from a Geophysical and Geomorphological Mars Analog Field Study at the Great Kobuk Sand Dunes, Northwestern Alaska

    E-Print Network [OSTI]

    Stillman, David E.

    Kobuk Sand Dunes, Northwestern Alaska Mcginnis, R. N.1 ; C. L. Dinwiddie1 ; D. Stillman2 ; K. Bjella3 of Engineers, Fairbanks, AK, United States. Terrestrial dune systems are used as natural analogs to improve understanding of the processes by which planetary dunes form and evolve. Selected terrestrial analogs are often

  16. A comparison of general circulation model predictions to sand drift and dune orientations

    SciTech Connect (OSTI)

    Blumberg, D.G.; Greeley, R.

    1996-12-01

    The growing concern over climate change and decertification stresses the importance of aeolian process prediction. In this paper the use of a general circulation model to predict current aeolian features is examined. A GCM developed at NASA/Goddard Space Flight Center was used in conjunction with White`s aeolian sand flux model to produce a global potential aeolian transport map. Surface wind shear stress predictions were used from the output of a GCM simulation that was performed as part of the Atmospheric Model Intercomparison Project on 1979 climate conditions. The spatial resolution of this study (as driven by the GCM) is 4{degrees} X 5{degrees}; instantaneous 6-hourly wind stress data were saved by the GCM and used in this report. A global map showing potential sand transport was compared to drift potential directions as inferred from Landsat images from the 1980s for several sand seas and a coastal dune field. Generally, results show a good correlation between the simulated sand drift direction and the drift direction inferred for dune forms. Discrepancies between the drift potential and the drift inferred from images were found in the North American deserts and the Arabian peninsula. An attempt to predict the type of dune that would be formed in specific regions was not successful. The model could probably be further improved by incorporating soil moisture, surface roughness, and vegetation information for a better assessment of sand threshold conditions. The correlation may permit use of a GCM to analyze {open_quotes}fossil{close_quotes} dunes or to forecast aeolian processes. 48 refs., 8 figs.

  17. Mineral resources of the Buffalo Hump and Sand Dunes Addition Wilderness Study Areas, Sweetwater County, Wyoming

    SciTech Connect (OSTI)

    Gibbons, A.B.; Barbon, H.N.; Kulik, D.M. (Geological Survey, Reston, VA (USA)); McDonnell, J.R. Jr. (US Bureau of Mines (US))

    1990-01-01

    The authors present a study to assess the potential for undiscovered mineral resources and appraise the identified resources of the Buffalo Hump and Sand Dunes Addition Wilderness Study Areas, southwestern Wyoming, There are no mines, prospects, or mineralized areas nor any producing oil or gas wells; however, there are occurrences of coal, claystone and shale, and sand. There is a moderate resource potential for oil shale and natural gas and a low resource potential for oil, for metals, including uranium, and for geothermal sources.

  18. Global Sea Level Stabilization-Sand Dune Fixation: A Solar-powered Sahara Seawater Textile Pipeline

    E-Print Network [OSTI]

    Viorel Badescu; Richard B. Cathcart; Alexander A. Bolonkin

    2007-07-21

    Could anthropogenic saturation with pumped seawater of the porous ground of active sand dune fields in major deserts (e.g., the westernmost Sahara) cause a beneficial reduction of global sea level? Seawater extraction from the ocean, and its deposition on deserted sand dune fields in Mauritania and elsewhere via a Solar-powered Seawater Textile Pipeline (SSTP) can thwart the postulated future global sea level. Thus, Macro-engineering offers an additional cure for anticipated coastal change, driven by global sea level rise, that could supplement, or substitute for (1) stabilizing the shoreline with costly defensive public works (armoring macroprojects) and (2) permanent retreat from the existing shoreline (real and capital property abandonment). We propose Macro-engineering use tactical technologies that sculpt and vegetate barren near-coast sand dune fields with seawater, seawater that would otherwise, as commonly postulated, enlarge Earth seascape area! Our Macro-engineering speculation blends eremology with hydrogeology and some hydromancy. We estimate its cost at 1 billion dollars - about 0.01 per sent of the USA 2007 Gross Domestic Product.

  19. Impact of early diagenesis of Eolian reservoirs, Great Sand Dunes National Monument, Colorado

    SciTech Connect (OSTI)

    Krystinik, L.F.; Andrews, S.; Fryberger, S.G.

    1985-02-01

    Dune and associated alluvial and playa deposits at Great Sand Dunes National Monument, Colorado, provide an excellent opportunity to study early diagenetic development of vertical and horizontal permeability barriers in recent eolian deposits (> 10 ka). Cements observed include calcite, aragonite, protodolomite(.), amorphous silica, iron hydroxide, smectite, trona, and halite. Cementation is controlled by the availability of water, with several hydrologic subenvironments producing different cements. Evaporative cementation in dunes adjacent to playas is commonly dominated by trona and halite, but calcite, aragonite, and amorphous silica also bind the sediment. These cements are generally most concentrated in fine laminations where capillary action has pulled water into dunes. Iron hydroxides, calcite, and amorphous silica precipitate at the interface between ground water and streams or lakes, where the pH gradient may exceed 5 pH units (pH 5.7-11.5). Subsequent movement of the ground-water table can result in cross-cutting cement zones. Early cementation in dunes prevents deflation and provides a mechanism for preservation of the reservoir unit. Intense cementation may permanently occlude porosity, or leaching may reestablish well-interconnected porosity. An understanding of the extent and composition of early cement zones can be used to improve hydrodynamic models for production and enhanced recovery.

  20. Deposition of carbonate mud beds within high-energy subtidal sand Dunes, Bahamas

    SciTech Connect (OSTI)

    Dill, R.F.; Steinen, R.P.

    1988-01-01

    Laminated, carbonate mud beds are being deposited in the interisland channels of the Exuma Cays in the Bahamas. They are associated with stromatolites and interbedded with ooid sands that form large migrating subtidal dunes on flood tidal deltas and bars. Currents up to 3 knots sweep in and out of the 4-8 m deep channels 3 hours out of every 6 hours, creating a high-energy bank margin environment not usually considered to be the site of mud-sized particle deposition. Mud deposits reach thicknesses of 1 m and have individual beds 2-5 cm thick. When exposed to flowing seawater, bed surfaces become encrusted with carbonate cement and algal mats. The white interior of mud beds between the crusts appears homogeneous, is soft, and has the consistency of ''tooth paste.'' Loose uncemented ooid sand is found above and below the mud beds, showing that both are occupying the same depositional environment. Rip-up clasts of the crusted mud beds, formed by scour of underlying sands, are carried throughout the channels and accumulate as a lag deposit within the troughs of migrating dunes. Some clasts are colonized by algal mats that trap ooid and skeletal sands forming stromatolite structures that can grow up to 2 m high.

  1. Debris-flow benches: Dune-contact deposits record paleo-sand dune positions in north Panamint Valley, Inyo County, California

    SciTech Connect (OSTI)

    Anderson, S.P. (Univ., of California, Berkeley (USA)); Anderson, R.S. (Univ. of California, Santa Cruz (USA))

    1990-06-01

    Debris flows debouching onto the alluvial fan at the north end of Panamint Valley, California, have been episodically impounded behind sand dunes, resulting in boulder-strewn, nearly flat topped deposits in irregular basins upslope of the dune, whose upper surface is higher than the adjacent fan surface. Upslope migration of the dune field over and beyond these deposits eventually leaves them as debris-flow benches rising above the general fan surface. These features are therefore dune-contact forms, analogous to ice-contact forms such as kame terraces, in that both involve deposition against ephemeral barriers. Benches punctuate the alluvial-fan surface for 5 km downfan from the modern dune field. Clast seismic velocities of boulders on these benches indicate that bench ages increase monotonically with distance from the present dunes, implying that the dune field has migrated up the fan. Because the oldest bench is below the altitude of the highest pluvial lake shoreline in Panamint Valley (Gale Stage, ca. 50 ka) and slightly above the latest lakeshore (I Stage, ca. 14 ka), it seems likely that the dunes originated near the shore of the latest lake and have moved upfan at an average rate of 0.8 m/yr.

  2. Resource Utilization and Coexistence of Seed-Eating Desert Rodents in Sand Dune Habitats Author(s): James H. Brown and Gerald A. Lieberman

    E-Print Network [OSTI]

    Brown, James H.

    Resource Utilization and Coexistence of Seed-Eating Desert Rodents in Sand Dune Habitats Author UTILIZATION AND COEXISTENCE OF SEED-EATING DESERT RODENTS IN SAND DUNE HABITATS' JAMES H. BROWN Department how these differences affect the utilization of seeds. Our estimates of total overlap in resource

  3. Dunes

    E-Print Network [OSTI]

    Reed, Michelle

    2006-01-01

    Dunes MICHELLE REED On October SO, 1993, the Mirage Resorts, Inc., imploded the casino and north tower, which was televised. The Dunes's death signified the birth of another resort. n I ily, we're going to be late," Robert says. He paces... to say about the Dunes." Robert sighs loudly as he moves around the room. He fluffs the pillows beside me on the sofa and straightens the pile of magazines on the floor beside his chair. It's not his fault that he doesn't understand. He doesn't know...

  4. VOLUME 88, NUMBER 5 P H Y S I C A L R E V I E W L E T T E R S 4 FEBRUARY 2002 Minimal Model for Sand Dunes

    E-Print Network [OSTI]

    for Sand Dunes Klaus Kroy,* Gerd Sauermann, and Hans J. Herrmann PMMH, Ã?cole Superieure de Physique et; published 16 January 2002) We propose a minimal model for aeolian sand dunes. It combines an analytical description of the turbulent wind velocity field above the dune with a continuum saltation model that allows

  5. Studies of the terrestrial O{sub 2} and carbon cycles in sand dune gases and in biosphere 2

    SciTech Connect (OSTI)

    Severinghaus, J.P.

    1995-12-31

    Molecular oxygen in the atmosphere is coupled tightly to the terrestrial carbon cycle by the processes of photosynthesis, respiration, and burning. This dissertation examines different aspects of this coupling in four chapters. Chapter 1 explores the feasibility of using air from sand dunes to reconstruct atmospheric O{sub 2} composition centuries ago. Such a record would reveal changes in the mass of the terrestrial biosphere, after correction for known fossil fuel combustion, and constrain the fate of anthropogenic CO{sub 2}.

  6. Difference in the wind speeds required for initiation versus continuation of sand transport on Mars: Implications for dunes and dust storms

    E-Print Network [OSTI]

    Kok, Jasper F

    2010-01-01

    Much of the surface of Mars is covered by dunes, ripples, and other features formed by the blowing of sand by wind, known as saltation. In addition, saltation loads the atmosphere with dust aerosols, which dominate the Martian climate. We show here that saltation can be maintained on Mars by wind speeds an order of magnitude less than required to initiate it. We further show that the resulting hysteresis effect causes saltation to occur for much lower wind speeds than previously thought. These findings have important implications for the formation of dust storms, sand dunes, and ripples on Mars.

  7. Morphologic and computational fluid dynamic analysis of sand dune-topographic obstacle interactions on Earth and Titan 

    E-Print Network [OSTI]

    Cisneros, Julia

    2014-09-24

    and their interaction with topographic obstacles within the dune fields are thought to indicate westerly wind flow, which is opposite the easterly flow expected based on the spin of Titan and predicted from several global climate models (GCMs). The westerly...

  8. ACULEATA HYMENOPTERA OF SAND MOUNTAIN AND BLOW SAND MOUNTAINS, NEVADA

    E-Print Network [OSTI]

    Hanks, Lawrence M.

    ACULEATA HYMENOPTERA OF SAND MOUNTAIN AND BLOW SAND MOUNTAINS, NEVADA R. W. Rust1, L. !\\1. Hanks collected from Sand !\\1ountain and Blow Sand Mountains, Nevada. Four species are considered new to science and none are considered endemic to ei ther dune area. Sand Mountain and Blow Sand Mountains were visited 19

  9. Arthropod monitoring for fine-scale habitat analysis: A case study of the El Segundo sand dunes

    SciTech Connect (OSTI)

    Mattoni, R.; Longcore, T.; Novotny, V.

    2000-04-01

    Arthropod communities from several habitats on and adjacent to the El Segundo dunes (Los Angeles County, CA) were sampled using pitfall and yellow pan traps to evaluate their possible use as indicators of restoration success. Communities were ordinated and clustered using correspondence analysis, detrended correspondence analysis, two-way indicator species analysis, and Ward's method of agglomerative clustering. The results showed high repeatability among replicates within any sampling arena that permits discrimination of (1) degraded and relatively undisturbed habitat, (2) different dune habitat types, and (3) annual change. Canonical correspondence analysis showed a significant effect of disturbance history on community composition that explained 5--20% of the variation. Replicates of pitfall and yellow pan traps on single sites clustered together reliably when species abundance was considered, whereas clusters using only species incidence did not group replicates as consistently. The broad taxonomic approach seems appropriate for habitat evaluation and monitoring of restoration projects as an alternative to assessments geared to single species or even single families.

  10. Barchan dune asymmetry: Numerical investigation

    E-Print Network [OSTI]

    Parteli, Eric J R; Bourke, Mary C; Tsoar, Haim; Poeschel, Thorsten; Herrmann, Hans J

    2013-01-01

    Barchan dunes --- crescent-shaped dunes that form in areas of unidirectional winds and low sand availability --- commonly display an asymmetric shape, with one limb extended downwind. Several factors have been identified as potential causes for barchan dune asymmetry on Earth and Mars: asymmetric bimodal wind regime, topography, influx asymmetry and dune collision. However, the dynamics and potential range of barchan morphologies emerging under each specific scenario that leads to dune asymmetry are far from being understood. In the present work, we use dune modeling in order to investigate the formation and evolution of asymmetric barchans. We find that a bimodal wind regime causes limb extension when the divergence angle between primary and secondary winds is larger than $90^{\\circ}$, whereas the extended limb evolves into a seif dune if the ratio between secondary and primary transport rates is larger than 25%. Calculations of dune formation on an inclined surface under constant wind direction also lead to...

  11. Size distribution and structure of Barchan dune fields

    E-Print Network [OSTI]

    Orencio Durán; Veit Schwämmle; Pedro G. Lind; Hans J. Herrmann

    2011-05-19

    Barchans are isolated mobile dunes often organized in large dune fields. Dune fields seem to present a characteristic dune size and spacing, which suggests a cooperative behavior based on dune interaction. In Duran et al. (2009), we propose that the redistribution of sand by collisions between dunes is a key element for the stability and size selection of barchan dune fields. This approach was based on a mean-field model ignoring the spatial distribution of dune fields. Here, we present a simplified dune field model that includes the spatial evolution of individual dunes as well as their interaction through sand exchange and binary collisions. As a result, the dune field evolves towards a steady state that depends on the boundary conditions. Comparing our results with measurements of Moroccan dune fields, we find that the simulated fields have the same dune size distribution as in real fields but fail to reproduce their homogeneity along the wind direction.

  12. On the shape of barchan dunes

    E-Print Network [OSTI]

    Klaus Kroy; Sebastian Fischer; Benedikt Obermayer

    2005-01-07

    Barchans are crescent-shaped sand dunes forming in aride regions with unidirectional wind and limited sand supply. We report analytical and numerical results for dune shapes under different environmental conditions as obtained from the so-called `minimal model' of aeolian sand dunes. The profiles of longitudinal vertical slices (i.e. along the wind direction) are analyzed as a function of wind speed and sand supply. Shape transitions can be induced by changes of mass, wind speed and sand supply. Within a minimal extension of the model to the transverse direction the scale-invariant profile of transverse vertical cuts can be derived analytically.

  13. Rides et Dunes de Sable Alexandre Valance

    E-Print Network [OSTI]

    Lucas, Carine - Le Laboratoire de Mathématiques

    1 Rides et Dunes de Sable Alexandre Valance Institut de Physique de Rennes (IPR), CNRS UMR 6251-linéaire: murissement, saturation Dunes transverses, Barkhanes, Rides éoliennes Sources: · A. Valance: « Dynamique Fluviatile » (Cours M2 Systèmes Complexes, Rennes) · F. Charru et al. : « Ripples and Sand dunes » (Annual

  14. Linear stability analysis of transverse dunes

    E-Print Network [OSTI]

    Melo, Hygor P M; Andrade, José S; Herrmann, Hans J

    2012-01-01

    Sand-moving winds blowing from a constant direction in an area of high sand availability form transverse dunes, which have a fixed profile in the direction orthogonal to the wind. Here we show, by means of a linear stability analysis, that transverse dunes are intrinsically unstable. Any along-axis perturbation on a transverse dune amplify in the course of dune migration due to the combined effect of two main factors, namely: the lateral transport through avalanches along the dune's slip-face, and the scaling of dune migration velocity with the inverse of the dune height. Our calculations provide a quantitative explanation for recent observations from experiments and numerical simulations, which showed that transverse dunes moving on the bedrock cannot exist in a stable form and decay into a chain of crescent-shaped barchans.

  15. Linear stability analysis of transverse dunes

    E-Print Network [OSTI]

    Hygor P. M. Melo; Eric J. R. Parteli; José S. Andrade Jr; Hans J. Herrmann

    2012-02-16

    Sand-moving winds blowing from a constant direction in an area of high sand availability form transverse dunes, which have a fixed profile in the direction orthogonal to the wind. Here we show, by means of a linear stability analysis, that transverse dunes are intrinsically unstable. Any along-axis perturbation on a transverse dune amplify in the course of dune migration due to the combined effect of two main factors, namely: the lateral transport through avalanches along the dune's slip-face, and the scaling of dune migration velocity with the inverse of the dune height. Our calculations provide a quantitative explanation for recent observations from experiments and numerical simulations, which showed that transverse dunes moving on the bedrock cannot exist in a stable form and decay into a chain of crescent-shaped barchans.

  16. Sixth International Conference on Aeolian Research, Guelph, Canada. 2006 Barchan dune morphodynamics and linear dune formation on Mars

    E-Print Network [OSTI]

    Bourke, Mary C.

    Sixth International Conference on Aeolian Research, Guelph, Canada. 2006 Barchan dune morphodynamics and linear dune formation on Mars Mary C. Bourke, Planetary Science Institute, Tucson, mbourke@psi.edu Observations of sand dunes in satellite images indicate a wide variety of dune forms on Mars. Similar to Earth

  17. 2 eme Atelier International \\Formation et Migration des Dunes", Nouakchott, 7 -13 f evrier 2001 On the rate of aeolian sand transport

    E-Print Network [OSTI]

    Sørensen, Michael

    2001 On the rate of aeolian sand transport Michael S#31;RENSEN #3; #3; Department of Statistics. Abstract: An analytic formula for for rate of aeolian sand transport is derived by introducing a few reasonable approximations in the equations of motion of the sand grains and in the model for the modi#12

  18. When dunes move together, structure of deserts emerges

    E-Print Network [OSTI]

    Génois, Mathieu; Pont, Sylvain Courrech du; Grégoire, Guillaume

    2012-01-01

    Crescent shaped barchan dunes are highly mobile dunes that are usually presented as a prototypical model of sand dunes. Although they have been theoretically shown to be unstable when considered separately, it is well known that they form large assemblies in desert. Collisions of dunes have been proposed as a mechanism to redistribute sand between dunes and prevent the formation of heavily large dunes, resulting in a stabilizing effect in the context of a dense barchan field. Yet, no models are able to explain the spatial structures of dunes observed in deserts. Here, we use an agent-based model with elementary rules of sand redistribution during collisions to access the full dynamics of very large barchan dune fields. Consequently, stationnary, out of equilibrium states emerge. Trigging the dune field density by a sand load/lost ratio, we show that large dune fields exhibit two assymtotic regimes: a dilute regime, where sand dune nucleation is needed to maintain a dune field, and a dense regime, where dune c...

  19. Modelling Desert Dune Fields Based on Discrete Dynamics STEVEN R. BISHOPa,

    E-Print Network [OSTI]

    Carretero, Ricardo

    Modelling Desert Dune Fields Based on Discrete Dynamics STEVEN R. BISHOPa, *, HIROSHI MOMIJIb is developed to model the dynamics of sand dunes. The physical processes display strong non-linearity that has features we monitor morphology, dune growth, dune migration and spatial patterns within a dune field

  20. Dunes on Mars, `Venus', Earth, and subaqueous ripples: a scaling law for their elementary size

    E-Print Network [OSTI]

    Claudin, Philippe

    Dunes on Mars, `Venus', Earth, and subaqueous ripples: a scaling law for their elementary size P@pmmh.espci.fr Dunes and bedforms are observed in considerably di- verse environments: aeolian dunes of sand as well as snow, dunes under water, but also dunes on Mars or Titan. Summarising our work published in [1], we

  1. Eolian reservoir characteristics predicted from dune type

    SciTech Connect (OSTI)

    Kocurek, G.; Nielson, J.

    1985-02-01

    The nature of eolian-dune reservoirs is strongly influenced by stratification types (in decreasing order of quality: grain-flow, grain-fall, wind-ripple deposits) and their packaging by internal bounding surfaces. These are, in turn, a function of dune surface processes and migration behavior, allowing for predictive models of reservoir behavior. Migrating, simple crescentic dunes produce tabular bodies consisting mainly of grain-flow cross-strata, and form the best, most predictable reservoirs. Reservoir character improves as both original dune height and preserved set thickness increase, because fewer grain-fall deposits and a lower percentage of dune-apron deposits occur in the cross-strata, respectively. It is probable that many linear and star dunes migrate laterally, leaving a blanket of packages of wind ripple laminae reflecting deposition of broad, shifting aprons. This is distinct from models generated by freezing large portions of these dunes in place. Trailing margins of linear and star dunes are prone to reworking by sand-sheet processes that decrease potential reservoir quality. The occurrence of parabolic dunes isolated on vegetated sand sheets results in a core of grain-flow and grain-fall deposits surrounded by less permeable and porous deposits. Compound crescentic dunes, perhaps the most preservable dune type, may yield laterally (1) single sets of cross-strate, (2) compound sets derived from superimposed simple dunes, or (3) a complex of diverse sets derived from superimposed transverse and linear elements.

  2. Deformation mechanisms during uplift of buried pipes in sand Mcanismes de dformation lors du soulvement d'une conduite enterre dans le sable

    E-Print Network [OSTI]

    Bolton, Malcolm

    Deformation mechanisms during uplift of buried pipes in sand Mécanismes de déformation lors du uplift of a pipe buried in sand, a series of tests was conducted in a plane-strain calibration chamber. During uplift, wide zones of distributed shear developed between the pipe shoulders and the ground

  3. The dune size distribution and scaling relations of barchan dune fields

    E-Print Network [OSTI]

    Orencio Durán; Veit Schwämmle; Pedro G. Lind; Hans J. Herrmann

    2008-10-27

    Barchan dunes emerge as a collective phenomena involving the generation of thousands of them in so called barchan dune fields. By measuring the size and position of dunes in Moroccan barchan dune fields, we find that these dunes tend to distribute uniformly in space and follow an unique size distribution function. We introduce an analyticalmean-field approach to show that this empirical size distribution emerges from the interplay of dune collisions and sand flux balance, the two simplest mechanisms for size selection. The analytical model also predicts a scaling relation between the fundamental macroscopic properties characterizing a dune field, namely the inter-dune spacing and the first and second moments of the dune size distribution.

  4. Hybrid eolian dunes of William River Dune field, northern Saskatchewan, Canada

    SciTech Connect (OSTI)

    Carson, M.A.; MacLean, P.A.

    1985-02-01

    A series of northwest-southeast aligned, large-scale (up to 30 m high) eolian dunes, occurring in a confined (600 km/sup 2/) desert area in northern Saskatchewan, Canada, was examined in the field. Observations were made of dune morphology and internal structure, and patterns of sand movement on the dunes were analyzed in relation to wind events during the summer of 1981. Present cross-sectional profiles exhibit steeper northeast slopes, the lower segment of which are intermittently covered by psammophilous grasses. Dune structure is dominated by northeast-dipping accretion laminae. Three /sup 14/C dates from organic material cropping out on the lower southwest slopes reveal that the dunes have migrated as transverse bed forms at rates of roughly 0.5 m/yr during the last few hundred years. However, a progressive increase in height, bulk, and symmetry along the dune axis from northwest to southeast, suggests an along-dune component of sand transport. This view is supported by (1) field measurements of airflow and along-dune sand transport patterns on 2 dunes, and (2) the present-day wind regime (1963-78). Dominated by north-northeast to northeast winds from January to June and by west-southwest winds from July to December, the resultant potential sand transport vector is toward the southeast, virtually identical to the dune axis.

  5. RESEARCH ARTICLE The scale of genetic differentiation in the Dunes Sagebrush-Lizard

    E-Print Network [OSTI]

    Zamudio, Kelly R.

    RESEARCH ARTICLE The scale of genetic differentiation in the Dunes Sagebrush-Lizard (Sceloporus+Business Media B.V. 2008 Abstract The Dunes Sagebrush-Lizard (Sceloporus are- nicolus) is a North American species endemic to sand- shinnery oak habitats of the Mescalero and Monahans sand dunes in eastern New

  6. DIGITAL PHOTOGRAMMETRIC CHANGE ANALYSIS AS APPLIED TO ACTIVE COASTAL DUNES IN MICHIGAN

    E-Print Network [OSTI]

    Brown, Daniel G.

    DIGITAL PHOTOGRAMMETRIC CHANGE ANALYSIS AS APPLIED TO ACTIVE COASTAL DUNES IN MICHIGAN Daniel G COASTAL DUNES IN MICHIGAN Abstract A pilot study was conducted to investigate the applicability of digital sand (i.e., dune fields and sand sheets) easily mobilize when stabilizing vegetation is somehow reduced

  7. Morphodynamics of barchan and transverse dunes using a cellular automaton model

    E-Print Network [OSTI]

    Narteau, Clément

    Morphodynamics of barchan and transverse dunes using a cellular automaton model D. Zhang,1 C instability is responsible for the formation of dunes on flat sand beds and the initiation of superimposed bedforms on dune slopes. In transverse dune fields, secondary bedforms increase crestline sinuosity

  8. An aeolian transport model for the selection of dune restoration alternatives 

    E-Print Network [OSTI]

    Bell, James Clayton

    2007-04-25

    . Following the storm, the Pointe San Luis Property Owner's Association contacted Texas A&M University to design a dune restoration strategy. The greatest natural contributor to dune reconstruction is the available sand delivered by aeolian transport. During...

  9. Eolian cover sands: a sedimentologic model and paleoenvironmental implications

    SciTech Connect (OSTI)

    Lea, P.D.

    1985-01-01

    In periglacial areas, accumulations of eolian sand commonly form low-relief blankets without well-developed dunes. Internally, these sandsheet deposits exhibit subhorizontal lamination rather than high-angle cross-bedding. Such cover sands of late-Pleistocene age mantle extensive areas in northern Europe, but have been reported more rarely from North America. The processes by which cover sands, as opposed to dunes, accumulate have not yet been determined conclusively. Wind ripples and sand dunes do not form a continuum; flow separation and avalanching and negligible in the former and vital in the latter. Accretion of a sand patch into a mound sufficient to cause flow separation and dune growth requires a consistently available supply of loose sand. In cover-sand areas, sand may be immobilized prior to dune development by several factors: (1) a sparse vegetation cover, (2) moist ground conditions, (3) snow cover, and (4) a shallow permafrost table and/or an ice-cemented active layer. Detailed sedimentologic studies may allow discrimination among these various controls. The importance of the individual controlling factors can vary seasonally in a given deposit, as well as between deposits in different paleogeographic settings. However, all factors imply more mesic conditions than those associated with many dune deposits. The association of cover sands with paraboloid dunes is also consistent with somewhat moist conditions. The relatively mesic nature of cover sands controls their Pleistocene distribution; they become decreasingly important relative to dunes in maritime-to-continental transects across Alaska and northern Europe.

  10. Relevant Length Scale of Barchan Dunes Pascal Hersen, Stephane Douady, and Bruno Andreotti

    E-Print Network [OSTI]

    Relevant Length Scale of Barchan Dunes Pascal Hersen, Ste´phane Douady, and Bruno Andreotti 1 barchan dunes under water: some sand is put on a tray moving periodically and asymmetrically in a water tank, and barchans rapidly form. We measure basic morphological and dynamical properties of these dunes

  11. The Use of Terrestrial Laser Scanning (TLS) in Dune Ecosystems: The Lessons Learned

    E-Print Network [OSTI]

    The Use of Terrestrial Laser Scanning (TLS) in Dune Ecosystems: The Lessons Learned Rusty A. Feagin of terrestrial laser scanning (TLS) in dune ecosystems: the lessons learned. Journal of Coastal Research, 30 terrestrial laser scanning (TLS) to quantify sand dune geomorphology. As an example of the use of TLS, we

  12. Why Do Active and Stabilized Dunes Coexist under the Same Climatic Conditions? Hezi Yizhaq,1

    E-Print Network [OSTI]

    Ashkenazy, Yossi "Yosef"

    Why Do Active and Stabilized Dunes Coexist under the Same Climatic Conditions? Hezi Yizhaq,1 Yosef (Received 4 November 2006; revised manuscript received 13 February 2007; published 2 May 2007) Sand dunes, there exists as yet unexplained evidence for the coexistence of bare mobile dunes and vegetated stabilized

  13. Non-target effects of invasive species management: beachgrass, birds, and bulldozers in coastal dunes

    E-Print Network [OSTI]

    dunes PHOEBE L. ZARNETSKE,1, ERIC W. SEABLOOM,2 AND SALLY D. HACKER 1 1 Department of Zoology, Oregon may have knock-on effects on non-target native species and ecosystems. For example, coastal dunes arenaria and Ammophila breviligulata. These invasive grasses have converted open, low-lying sand dunes

  14. On the transition between 2D and 3D dunes JEREMY G. VENDITTI*1

    E-Print Network [OSTI]

    Venditti, Jeremy G.

    On the transition between 2D and 3D dunes JEREMY G. VENDITTI*1 , MICHAEL CHURCH* and SEAN J the processes that transform the bed configuration from two-dimensional (2D) dunes to three- dimensional (3D) dunes. A narrowly graded, 500 lm size sand was subjected to a 0Æ15 m deep, non-varying mean flow ranging

  15. Sandy beaches and dunes provide a natural buffer to coastal hazards, habitat for many estuarine species, and water quality services. While

    E-Print Network [OSTI]

    Sandy beaches and dunes provide a natural buffer to coastal hazards, habitat for many estuarine recreation. The importance of sandy shores was recognized with the passage of the Coastal Primary Sand Dune also defined a beach and coastal primary sand dune and included a list of those plants which grow upon

  16. Observation of Density Segregation inside Migrating Dunes

    E-Print Network [OSTI]

    Christopher Groh; Ingo Rehberg; Christof A. Kruelle

    2011-09-18

    Spatiotemporal patterns in nature, such as ripples or dunes, formed by a fluid streaming over a sandy surface show complex behavior despite their simple forms. Below the surface, the granular structure of the sand particles is subject to self-organization processes, exhibiting such phenomena as reverse grading when larger particles are found on top of smaller ones. Here we report results of an experimental investigation with downscaled model dunes revealing that, if the particles differ not in size but in density, the heavier particles, surprisingly, accumulate in the central core close to the top of the dune. This finding contributes to the understanding of sedimentary structures found in nature and might be helpful to improve existing dating methods for desert dunes.

  17. Modeling the large-scale structure of a barchan dune field

    E-Print Network [OSTI]

    S. Worman; A. B. Murray; R. Littlewood; B. Andreotti; P. Claudin

    2013-07-12

    In nature, barchan dunes typically exist as members of larger fields that display striking, enigmatic structures that cannot be readily explained by examining the dynamics at the scale of single dunes, or by appealing to patterns in external forcing. To explore the possibility that observed structures emerge spontaneously as a collective result of many dunes interacting with each other, we built a numerical model that treats barchans as discrete entities that interact with one another according to simplified rules derived from theoretical and numerical work and from field observations: (1) Dunes exchange sand through the fluxes that leak from the downwind side of each dune and are captured on their upstream sides; (2) when dunes become sufficiently large, small dunes are born on their downwind sides (`calving'); and (3) when dunes collide directly enough, they merge. Results show that these relatively simple interactions provide potential explanations for a range of field-scale phenomena including isolated patches of dunes and heterogeneous arrangements of similarly sized dunes in denser fields. The results also suggest that (1) dune field characteristics depend on the sand flux fed into the upwind boundary, although (2) moving downwind, the system approaches a common attracting state in which the memory of the upwind conditions vanishes. This work supports the hypothesis that calving exerts a first-order control on field-scale phenomena; it prevents individual dunes from growing without bound, as single-dune analyses suggest, and allows the formation of roughly realistic, persistent dune field patterns.

  18. Nuclear fuel rods along the sand dunes

    SciTech Connect (OSTI)

    Regan, M.B.

    1993-05-10

    Just north of the small town of Covert, Michigan, Consumers Power Co. officials and environmental activists are locked in a battle that marks a new phase in the nation's long-running struggle over nuclear power. The company's Palisades power plant reactor needs refueling. But the utility has no more room for the spent fuel rods it must place in its water-filled storage pool. So Consumers is taking advantage of a 1990 Nuclear Regulatory Commission rule that lets utilities store waste above ground without agency review. Palisades officials plan to transfer older radioactive fuel rods from its storage pool into concrete and steel silo-like casks on a site overlooking Lake Michigan. Over the next decade, nearly half of the nation's 109 operating nuclear plants will run out of space in water-filled storage pools and be forced to consider aboveground storage. The Palisades plant is causing a stir because it is the first to exploit the 1990 NRC rule, which doesn't require utilities to seek approval for waste-storage sites as long as the waste is stored in an approved container. Before 1990, five other utilities had received the agency O.K. for above-ground storage - but only after a lengthy and exhaustive analysis of each site.

  19. SLOW SAND FILTRATIONSLOW SAND FILTRATION

    E-Print Network [OSTI]

    SLOW SAND FILTRATIONSLOW SAND FILTRATION:: Timeless Technology and Recent AdvancesBiological Filtration Systems ­­ Riverbank FiltrationRiverbank Filtration ­­ Slow Sand FiltrationSlow Sand Filtration #12;Slow Sand Filtration (SSF)Slow Sand Filtration (SSF) Headspace Supernatant Water Schmutzdecke Raw

  20. British Geomorphological Research Group, Annual Meeting, Oxford, 2003. An analysis and classification of 'barchan' dunes on Mars.

    E-Print Network [OSTI]

    Bourke, Mary C.

    and classification of 'barchan' dunes on Mars. Bourke, M.C., and Balme, M. School of Geography and the Environment, University of Oxford, Oxford, OX1 3TB, UK. Mary.bourke@geog.ox.ac.uk Martian sand dunes have the potential and morphodynamics. Recognition of the characteristics of both recent and ancient dunes is the first step towards

  1. Species richness and vegetation pattern in interdune lowlands of an active dune field in Inner Mongolia, China

    E-Print Network [OSTI]

    Wu, Jianguo "Jingle"

    Species richness and vegetation pattern in interdune lowlands of an active dune field in Inner Limnocryptophyte species Psammophyte Semi-arid inner dunes Steppe species Species­area curve A B S T R A C T Vegetation pattern in lowlands between active sand dunes has rarely been studied, but it may play

  2. Sediment volume in the north polar sand seas of Mars

    SciTech Connect (OSTI)

    Lancaster, N.; Greeley, R. (Arizona State Univ., Tempe (USA))

    1990-07-10

    Data from studies of the cross-sectional area of terrestrial transverse dunes have been combined with maps of dune morphometry derived from Viking orbiter images to generate new estimates of sediment thickness and dune sediment volume in the north polar sand seas of Mars. A relationship between dune spacing and equivalent sediment thickness (EST) was developed from field data on Namibian and North American dunes and was applied to data on dune spacing and dune cover measured on Viking orbiter images to generate maps of dune sediment thickness for Martian north polar sand seas. There are four major sand seas in the north polar region of Mars, covering an area of 6.8 x 10{sup 5} km{sup 2}. Equivalent sediment thickness ranges between 0.5 and 6.1 m with a mean of 1.8 m. The sand seas contain a total of 1158 km{sup 3} of dune sediment, which may have been derived by erosion of polar layered deposits and concentrated in its present location by winds that change direction seasonally.

  3. Transverse instability of dunes

    E-Print Network [OSTI]

    Eric J. R. Parteli; José S. Andrade Jr.; Hans J. Herrmann

    2011-09-22

    The simplest type of dune is the transverse one, which propagates with invariant profile orthogonally to a fixed wind direction. Here we show numerically and with a linear stability analysis that transverse dunes are unstable with respect to along-axis perturbations in their profile and decay on the bedrock into barchan dunes. Any forcing modulation amplifies exponentially with growth rate determined by the dune turnover time. We estimate the distance covered by a transverse dune before fully decaying into barchans and identify the patterns produced by different types of perturbation.

  4. Barchan dune corridors: field characterization and investigation of control parameters

    E-Print Network [OSTI]

    Hicham Elbelrhiti; Bruno Andreotti; Philippe Claudin

    2007-07-10

    The structure of the barchan field located between Tarfaya and Laayoune (Atlantic Sahara, Morocco) is quantitatively investigated and compared to that in La Pampa de la Joya (Arequipa, Peru). On the basis of field measurements, we show how the volume, the velocity and the output sand flux of a dune can be computed from the value of its body and horn widths. The dune size distribution is obtained from the analysis of aerial photographs. It shows that these fields are in a statistically homogeneous state along the wind direction and present a `corridor' structure in the transverse direction, in which the dunes have a rather well selected size. Investigating the possible external parameters controlling these corridors, we demonstrate that none among topography, granulometry, wind and sand flux is relevant. We finally discuss the dynamical processes at work in these fields (collisions and wind fluctuations), and investigate the way they could regulate the size of the dunes. Furthermore we show that the overall sand flux transported by a dune field is smaller than the maximum transport that could be reached in the absence of dunes, i.e. in saltation over the solid ground.

  5. STUDIES OF DUNE CHANGE ON MARS COMBINING MOC AND HIRISE IMAGES. M. C. , A. Philippoff1

    E-Print Network [OSTI]

    Bourke, Mary C.

    STUDIES OF DUNE CHANGE ON MARS COMBINING MOC AND HIRISE IMAGES. M. C. Bourke1 , A. Philippoff1 in the circumpolar sand seas (76.2°N, 95.3°E) found that two 20 m wide dome dunes disappeared and a third reduced its volume by 15% over 3.04 Mars years [1]. Here we report on the findings of an extended dune monitoring

  6. Flow and sediment suspension events over low-angle dunes: Fraser Estuary, Canada

    E-Print Network [OSTI]

    Venditti, Jeremy G.

    Flow and sediment suspension events over low-angle dunes: Fraser Estuary, Canada R.W. Bradley,1 J, subaqueous sand dunes that control hydraulic flow resistance. It is widely thought that the primary mechanism for moving sandy bed material in these channels is large-scale coherent flow structures that cause suspension

  7. A Structural Solution for the Formation of Dunes in the Martian Polar Region Zuoxun Zeng1,2 , Stuart J. Birnbaum2

    E-Print Network [OSTI]

    Texas at San Antonio, University of

    A Structural Solution for the Formation of Dunes in the Martian Polar Region Zuoxun Zeng1_zeng@hotmail.com Introduction: Exotic sand dunes on Mars have been known since 1972 when NASA's Mariner 9 spacecraft transmitted of years according to the interpretation of impact craters preserved on some dunes [16]. The most extensive

  8. www.imperial.ac.uk/business-school Imperial MBA final project

    E-Print Network [OSTI]

    www.imperial.ac.uk/business-school Imperial MBA ­ final project #12;Imperial College Business economic development strategy in the mining industry: A Case Study of Lebowa Platinum Mine in South Africa-HOUSE PERSPECTIVES." MARTIN TREWHELLA PRINCIPAL, GLOBAL ENERGY PRACTICE, ARTHUR D. LITTLE #12;Commitment Projects

  9. GEOMORPHOLOGICAL EVIDENCE OF PLAUSIBLE WATER ACTIVITY AND EVAPORITIC DEPOSITION IN INTERDUNE AREAS OF THE GYPSUM-RICH OLYMPIA UNDAE DUNE FIELD. A.

    E-Print Network [OSTI]

    Bourke, Mary C.

    OF THE GYPSUM-RICH OLYMPIA UNDAE DUNE FIELD. A. Szynkiewicz1 , R.C. Ewing2 , K.E. Fishbaugh3 , M.C. Bourke4 , D, P.O. Box 1086, Holloman Air Force Base, NM 88330. Introduction: The Olympia Undae Dune Field. Although the dune sand is likely to be mainly com- posed of pyroxene-bearing sand, in some areas the gypsum

  10. Racism and Cultural Imperialism in Conrad's Heart of Darkness

    E-Print Network [OSTI]

    Deena, Seodial

    1997-01-01

    to demonstrate how subtle racism and cultural imperialismConrad of explicit racism. "‘ Very little criticalRACISM AND CULTURAL IMPERIALISM IN CONRAD’S HEART OF

  11. Sedimentary structures and textures of Rio Orinoco channel sands, Venezuela and Colombia

    SciTech Connect (OSTI)

    McKee, E.D.

    1989-01-01

    The majority of the sedimentary structures in the channel sands of the Orinoco River are planar cross-strata that are products of sand-wave deposition. Sands in these deposits are mostly medium-grained. Eolian dunes form on top of the sand waves when they are exposed to the trade winds at low river stages. The windblown sands are typically fine-grained.

  12. 3/14/08 5:40 PMGeotimes -March 2008 -Dunes: they're electric Page 1 of 2http://www.geotimes.org/mar08/article.html?id=nn_dunes.html

    E-Print Network [OSTI]

    Michigan, University of

    Submit or View Results Chin-Kiu Chris Cheng NEWS NOTES Dunes: they're electric Winds whipping across Earth's deserts have the power to dramatically alter the landscape. Sand gets violently thrown about and, given time, even a desert's dunes migrate. But the winds aren't acting alone. Scientists think

  13. A giant dune-dammed lake on the North Platte River, Nebraska

    SciTech Connect (OSTI)

    Swinehart, J.B. (Univ. of Nebraska, Lincoln, NE (United States). Conservation and Survey Div.); Loope, D.B. (Univ. of Nebraska, Lincoln, NE (United States). Dept. of Geology)

    1992-01-01

    The recent work in the Nebraska Sand Hills, just north of the North Platte Valley, has revealed the presence of numerous dune dams--sites where eolian sand has filled Pleistocene paleovalleys and caused the formation of lake basins containing abundant small, interdunal lakes. Although the Platte River is considered the southern margin of the Sand Hills, there is a 1,200 sq km triangular area of large dunes in Lincoln County just south of the South Platte. The authors hypothesize that large dunes migrated southward to fill the North Platte Valley during glacial maximum when both the North and South Platte were dry. As Rocky Mountain snowmelt and Great Plains precipitation increased during deglaciation, a single 65 km-long, 15 km-wide, 50 m-deep lake formed behind the massive dune dam. The tentative chronology suggests that the lake was in existence for at least several thousand years. They have not yet found compelling evidence of catastrophic flooding downstream of the former lake. Evidence of two large Quaternary lakes on the White Nile between Khartoum and Malakal (Sudan) was discovered in the 1960's. Shoreline deposits indicate the lakes were 400--600 km long and up to 50 km wide. Although the lakes have been attributed to repeated blockage of the White Nile by clay-rich Blue Nile deposits, the distribution and age of dune sand near the confluence of these rivers suggest that, as in the Nebraska example, the course of the White Nile was blocked by dunes when the region was desiccated in the Late Pleistocene. Lakes behind permeable dams rise to a level where input equals output. Earthen dams are vulnerable to overtopping and piping. The relatively high permeability of dune sand prevents or delays overtopping, and piping is prevented by the extremely high low hydraulic gradients that typify extant sand dams.

  14. Three-dimensional modeling of an aeolian dune/interdune system: Applications to hydrocarbon production

    SciTech Connect (OSTI)

    Pugh, J.M.; Glennie, K.W.; Williams, B.P.J. (Univ. of Aberdeen, Aberdeen (United Kingdom))

    1993-09-01

    The Al Liwa region of the northeast Rub Al Khali, United Arab Emirates, comprises compound crescentic draa and subcircular inland sabkhas that are flanked to their north by a sand sea of smaller dunes extending almost to the coast of the Arabian Gulf. This controlled the supply of sand from the north and influenced water-table positions within interdune areas. The draa, up to 170 m high, comprise both fine and coarse sands with a strong carbonate component, and are migrating very slowly to the south-southeast. The evaporite-encrusted interdune sabkhas often are underlain by foreset dune sands that also indicate transport to the south-southeast. The northern fringe of smaller dunes migrates southward more rapidly than the draa, but their northern supply of sand now has been cut off by flooding of the Gulf, initiating the deflation of coastal areas down to the water table. A deep-penetrating radar survey, coupled with large-scale trenching, provides a three-dimensional model of dune/interdune systems. This fieldwork aids a clearer understanding of dune/interdune heterogeneities and interconnectedness, which in turn is providing more realistic reservoir models for interwell simulation studies within the Permian Rotliegende gas fields of northwest Europe.

  15. Small Power Plant Exemption (06-SPPE-1) Imperial County

    E-Print Network [OSTI]

    Small Power Plant Exemption (06-SPPE-1) Imperial County NILAND GAS TURBINE PLANT PRESIDINGMEMBER (06-SPPE-1) Imperial County NILAND GAS TURBINE PLANT PRESIDINGMEMBER Exemption (SPPE). The Energy Commission Committee assigned to the Niland Gas Turbine Plant Project

  16. Sand Castle 

    E-Print Network [OSTI]

    Holden, E.

    1997-01-01

    s excavated at 20 meter intervals. At shovel test 6, a single burned chert flake was found at 10 cm in loamy sand. The test was dug to 70 cm, and no additional artifacts were found. Next, additional tests (8 and 9) were dug to the west at 10 meter... northern end of this area with shovel tests excavated at 20 mete r intervals near the shore and forty meter intervals at the northern end. At shovel test 61, a Yarbrough dart point was found at 35 cm in loamy sand. The test was dug to 70 cm...

  17. SAND REPORT SAND2004-2871

    E-Print Network [OSTI]

    Siefert, Chris

    SAND REPORT SAND2004-2871 Unlimited Release August 19, 2004 A Mathematical Framework for Multiscale://www.ntis.gov/ordering.htm #12;SAND2004-2871 Unlimited Release Printed August 19, 2004 A Mathematical Framework for Multiscale

  18. SAND REPORT SAND2006-0002

    E-Print Network [OSTI]

    Siefert, Chris

    SAND REPORT SAND2006-0002 Unlimited Release Printed March 2006 Computer Science Research Institute;Page 3 SAND2006-0002 Unlimited Release Printed March 2006 Computer Science Research Institute 2004

  19. SAND REPORT SAND2003-0799

    E-Print Network [OSTI]

    Ho, Cliff

    SAND REPORT SAND2003-0799 Unlimited Release Printed March 2003 Field Demonstrations://www.ntis.gov/help/ordermethods.asp?loc=7-4-0#online #12;3 SAND2003-0799 Unlimited Release Printed March 2003 Field Demonstrations

  20. SAND REPORT SAND2003-3410

    E-Print Network [OSTI]

    Ho, Cliff

    SAND REPORT SAND2003-3410 Unlimited Release Printed September 2003 Chemiresistor Microsensors://www.ntis.gov/help/ordermethods.asp?loc=7-4-0#online 2 #12;SAND2003-3410 Unlimited Release Printed September 2003 Chemiresistor Microsensors

  1. SAND REPORT SAND2004-1777

    E-Print Network [OSTI]

    Walker, Homer F.

    SAND REPORT SAND2004-1777 Unlimited Release Printed May 2004 Globalization techniques for Newton RTMENT OF EN ERGY · · UNITED STATES OF AM ERICA #12;SAND2004-1777 Unlimited Release Printed May 2004

  2. Evaluating Aeolian Sand Transport Vectors In Dune Blowouts 

    E-Print Network [OSTI]

    Randolph, Janelle

    2013-02-13

    Grain size distribution is the reflection of the feedback between sediment transport system and morphologic change of beach systems. In this respect, early models suggest that grain size can be used to determine the transport vectors. However...

  3. Sand Dunes Hot Spring Aquaculture Low Temperature Geothermal Facility |

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onRAPID/Geothermal/Exploration/ColoradoRemsenburg-Speonk,Sage Resources JumpDimas,Rey,Sanctuary, Texas: Energy

  4. Field evidence for the upwind velocity shift at the crest of low dunes

    E-Print Network [OSTI]

    P. Claudin; G. F. S. Wiggs; B. Andreotti

    2013-02-11

    Wind topographically forced by hills and sand dunes accelerates on the upwind (stoss) slopes and reduces on the downwind (lee) slopes. This secondary wind regime, however, possesses a subtle effect, reported here for the first time from field measurements of near-surface wind velocity over a low dune: the wind velocity close to the surface reaches its maximum upwind of the crest. Our field-measured data show that this upwind phase shift of velocity with respect to topography is found to be in quantitative agreement with the prediction of hydrodynamical linear analysis for turbulent flows with first order closures. This effect, together with sand transport spatial relaxation, is at the origin of the mechanisms of dune initiation, instability and growth.

  5. Field evidence for the upwind velocity shift at the crest of low dunes

    E-Print Network [OSTI]

    Claudin, P; Andreotti, B

    2012-01-01

    Wind topographically forced by hills and sand dunes accelerates on the upwind (stoss) slopes and reduces on the downwind (lee) sides. This secondary wind regime, however, possesses a subtle effect, reported here for the first time from field measurements of near-surface wind velocity over a low dune: the wind velocity close to the surface reaches its maximum upwind of the crest. Our field-measured data show that this upwind phase shift of velocity with respect to topography is found to be in quantitative agreement with the prediction of hydrodynamical linear analysis for turbulent flows with first order closures. This effect, together with sand transport spatial relaxation, is at the origin of the dune instability mechanism.

  6. Stratigraphic evidence for late Quaternary dune activity near Hudson on the Piedmont of northern Colorado

    SciTech Connect (OSTI)

    Forman, S.L.; Maat, P. (Univ. of Colorado, Boulder (USA))

    1990-08-01

    Stabilized dune fields are common features near Hudson, on the Piedmont of northern Colorado. Exposures in dune and interdune sites expose a sequence of eolian sediments and paleosols that record a complex history of eolian activity during the late Quaternary. Radiocarbon and thermoluminescence age estimates on A horizons buried by eolian sand indicate that dunes were reactivated sometime between 7 and 9 ka. On the basis of morphology of surface soils, the dunes were most recently stabilized <3 ka. At present that are no data to indicate if there were multiple periods of dune movement and stabilization during the Holocene. The penultimate pre-Holocene dune-forming episode probably terminated ca. 13 ka and may be coincident with the Pinedale glaciation. The stratigraphy at interdune sites shows at least two eolian depositional events prior to the penultimate event; they were separated by periods of pedogenesis, one of which may have exceeded 40 ka. This analysis indicates that dunes in northern Colorado were active during both cold-arid and warn-arid periods in the late Quaternary.

  7. Extraterrestrial dunes: An introduction to the special issue on planetary dune systems

    E-Print Network [OSTI]

    Bourke, Mary C.

    Extraterrestrial dunes: An introduction to the special issue on planetary dune systems Mary C 2010 Available online 29 April 2010 Keywords: Aeolian Dune Mars Venus Titan Earth Aeolian dune fields of planetary dune systems comes from the application of Earth analogs, wind tunnel experiments and modeling

  8. Grain size dependence of barchan dune dynamics

    E-Print Network [OSTI]

    C. Groh; N. Aksel; I. Rehberg; C. Kruelle

    2008-11-28

    The dependence of the barchan dune dynamics on the size of the grains involved is investigated experimentally. Downsized barchan dune slices are observed in a narrow water flow tube. The relaxation time from an initial symmetric triangular heap towards an asymmetric shape attractor increases with dune mass and decreases with grain size. The dune velocity increases with grain size. In contrast, the velocity scaling and the shape of the barchan dune is independent of the size of the grains.

  9. SAND REPORT SAND2003-1428

    E-Print Network [OSTI]

    SAND REPORT SAND2003-1428 Unlimited Release Printed May 2003 Cost Study for Large Wind Turbine://www.ntis.gov/ordering.htm #12;SAND2003-1428 Unlimited Release Printed May 2003 Cost Study for Large Wind Turbine Blades Wind Blades: WindPACT Blade System Design Studies TPI Composites, Inc. 373 Market Street Warren, RI 02885

  10. SAND REPORT SAND2002-4135

    E-Print Network [OSTI]

    Ho, Cliff

    SAND REPORT SAND2002-4135 Unlimited Release Printed December 2002 FY02 Field Evaluations of an In://www.ntis.gov/help/ordermethods.asp?loc=7-4-0#online #12;3 SAND2002-4135 Unlimited Release Printed December 2002 FY02 Field Evaluations

  11. Small Power Plant Exemption (06-SPPE-1) Imperial County

    E-Print Network [OSTI]

    Small Power Plant Exemption (06-SPPE-1) Imperial County NILAND GAS TURBINE PLANT COMMISSIONDECISION ENERGY COMMISSION Small Power Plant Exemption (06-SPPE-1) Imperial County NILAND GAS TURBINE PLANT GAS TURBINE PLANT SMALL POWER PLANT EXEMPTION DOCKET NO. 06-SPPE-1 The California Energy Commission

  12. Imperial Valley Geothermal Area | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i nA Guide to TappingWORKof71CommercialThisImperial Valley Geothermal project

  13. Mars north polar dunes: possible formation from low-density sediment aggregates

    SciTech Connect (OSTI)

    Saunders, R.S.; Blewett, D.T.

    1987-10-01

    Low-density aggregates, composed of submicron clay aerosols, have been formed experimentally as the sublimation residues of masses of dust-nucleated ice. These ice-dust mixtures are possible analogues of materials of Martian north polar deposits. Low-density (0.002 g/cm/sup 3/) spheroidal pellets formed from these materials in wind tunnel experiments have been examined as possible candidates for forming north polar dunes on Mars. It is shown that these particles move like sand grains under conditions of saltation and, given a sufficient supply, would be capable of forming the dunes observed in the north circumpolar erg.

  14. The record of sea level rise by tidal sand bodies of the English Channel

    SciTech Connect (OSTI)

    Berne, S; Lericolais, G. (Ifremer, Plouzane, (France)); Lafont, F. (Universite d'Orsay (France))

    1990-05-01

    Improvements of very high resolution seismic reflection provide new information about internal structures of modern sand bodies. This allows us to reconstruct their recent history, which is related to the Holocene sea level rise. A major distinction is found between inner shelf sand bodies, dominated by autocyclic processes, and outer shelf sand bodies, where allocyclic processes are invoked to explain the apparent contradiction between internal structures and present-day dynamics. On the inner shelf, evidence of the migration of tidal dunes (sand waves) has been obtained by repeated surveys using accurate positioning systems. Major bounding surfaces are thought to result from the action of tidal current and/or from episodic storms. A rough estimation of the age of these sand bodies can be proposed. On the outer shelf, some dunes of the English Channel exhibit cross-beds indicative of a past net bed-load transport at the opposite of present days dynamics, inherited from different tidal conditions when sea level was between 20 and 40 m lower. Some large tidal sand banks (e.g., the Sark Bank near the Channel Islands) display a more complicated pattern. The upper part of the sand bank is the result of the migration of very large dunes climbing at positive angles, whereas the lower part shows major erosional surfaces, attributed to the action of storms during lower sea levels.

  15. Low angle dune response to variable flow, dune translation and crestline dynamics in Fraser

    E-Print Network [OSTI]

    Venditti, Jeremy G.

    Low angle dune response to variable flow, dune translation and crestline dynamics in Fraser Estuary Approval Name: Megan Lillian Hendershot Degree: Master of Science Title: Low angle dune response to variable flow, dune translation and crestline dynamics in Fraser Estuary, British Columbia, Canada

  16. Wet Sand flows better than dry sand

    E-Print Network [OSTI]

    Jorge E. Fiscina; Christian Wagner

    2007-11-19

    We investigated the yield stress and the apparent viscosity of sand with and without small amounts of liquid. By pushing the sand through a tube with an enforced Poiseuille like profile we minimize the effect of avalanches and shear localization. We find that the system starts to flow when a critical shear of the order of one particle diameter is exceeded. In contrast to common believe, we observe that the resistance against the flow of wet sand is much smaller than that of dry sand. For the dissipative flow we propose a non-equilibrium state equation for granular fluids.

  17. World Literature and Economic Hegemony: Free-Trade Imperialism and 'Whole Populations Conjured Out of the Ground' in The Communist Manifesto

    E-Print Network [OSTI]

    Andre, Chris

    1996-01-01

    and Economic Hegemony: Free-Trade Imperialism and 'Wholeand Economic Hegemony: Free-Trade Imperialism and 'Wholedevelopment of British free-trade imperialism, while Marx

  18. Comment on "Minimal size of a barchan dune"

    E-Print Network [OSTI]

    B. Andreotti; P. Claudin

    2007-05-24

    It is now an accepted fact that the size at which dunes form from a flat sand bed as well as their `minimal size' scales on the flux saturation length. This length is by definition the relaxation length of the slowest mode toward equilibrium transport. The model presented by Parteli, Duran and Herrmann [Phys. Rev. E 75, 011301 (2007)] predicts that the saturation length decreases to zero as the inverse of the wind shear stress far from the threshold. We first show that their model is not self-consistent: even under large wind, the relaxation rate is limited by grain inertia and thus can not decrease to zero. A key argument presented by these authors comes from the discussion of the typical dune wavelength on Mars (650 m) on the basis of which they refute the scaling of the dune size with the drag length evidenced by Claudin and Andreotti [Earth Pla. Sci. Lett. 252, 30 (2006)]. They instead propose that Martian dunes, composed of large grains (500 micrometers), were formed in the past under very strong winds. We show that this saltating grain size, estimated from thermal diffusion measurements, is not reliable. Moreover, the microscopic photographs taken by the rovers on Martian aeolian bedforms show a grain size of 87 plus or minus 25 micrometers together with hematite spherules at millimetre scale. As those so-called ``blueberries'' can not be entrained by reasonable winds, we conclude that the saltating grains on Mars are the small ones, which gives a second strong argument against the model of Parteli et al.

  19. A Sterile Neutrino at DUNE

    E-Print Network [OSTI]

    Berryman, Jeffrey M; Kelly, Kevin J; Kobach, Andrew

    2015-01-01

    We investigate the potential for the Deep Underground Neutrino Experiment (DUNE) to probe the existence and effects of a fourth neutrino mass-eigenstate. We study the mixing of the fourth mass-eigenstate with the three active neutrinos of the Standard Model, including the effects of new sources of CP-invariance violation, for a wide range of new mass-squared differences, from lower than 10^-5 eV^2 to higher than 1 eV^2. DUNE is sensitive to previously unexplored regions of the mixing angle - mass-squared difference parameter space. If there is a fourth neutrino, in some regions of the parameter space, DUNE is able to measure the new oscillation parameters (some very precisely) and clearly identify two independent sources of CP-invariance violation. Finally, we use the hypothesis that there are four neutrino mass-eigenstates in order to ascertain how well DUNE can test the limits of the three-massive-neutrinos paradigm. In this way, we briefly explore whether light sterile neutrinos can serve as proxies for ot...

  20. DUNE: The Dark Universe Explorer

    E-Print Network [OSTI]

    A. Refregier; O. Boulade; Y. Mellier; B. Milliard; R. Pain; J. Michaud; F. Safa; A. Amara; P. Astier; E. Barrelet; E. Bertin; S. Boulade; C. Cara; A. Claret; L. Georges; R. Grange; J. Guy; C. Koeck; L. Kroely; C. Magneville; N. Palanque-Delabrouille; N. Regnault; G. Smadja; C. Schimd; Z. Sun

    2006-10-03

    Understanding the nature of Dark Matter and Dark Energy is one of the most pressing issues in cosmology and fundamental physics. The purpose of the DUNE (Dark UNiverse Explorer) mission is to study these two cosmological components with high precision, using a space-based weak lensing survey as its primary science driver. Weak lensing provides a measure of the distribution of dark matter in the universe and of the impact of dark energy on the growth of structures. DUNE will also include a complementary supernovae survey to measure the expansion history of the universe, thus giving independent additional constraints on dark energy. The baseline concept consists of a 1.2m telescope with a 0.5 square degree optical CCD camera. It is designed to be fast with reduced risks and costs, and to take advantage of the synergy between ground-based and space observations. Stringent requirements for weak lensing systematics were shown to be achievable with the baseline concept. This will allow DUNE to place strong constraints on cosmological parameters, including the equation of state parameter of the dark energy and its evolution from redshift 0 to 1. DUNE is the subject of an ongoing study led by the French Space Agency (CNES), and is being proposed for ESA's Cosmic Vision programme.

  1. A Sterile Neutrino at DUNE

    E-Print Network [OSTI]

    Jeffrey M. Berryman; Andre de Gouvea; Kevin J. Kelly; Andrew Kobach

    2015-07-14

    We investigate the potential for the Deep Underground Neutrino Experiment (DUNE) to probe the existence and effects of a fourth neutrino mass-eigenstate. We study the mixing of the fourth mass-eigenstate with the three active neutrinos of the Standard Model, including the effects of new sources of CP-invariance violation, for a wide range of new mass-squared differences, from lower than 10^-5 eV^2 to higher than 1 eV^2. DUNE is sensitive to previously unexplored regions of the mixing angle - mass-squared difference parameter space. If there is a fourth neutrino, in some regions of the parameter space, DUNE is able to measure the new oscillation parameters (some very precisely) and clearly identify two independent sources of CP-invariance violation. Finally, we use the hypothesis that there are four neutrino mass-eigenstates in order to ascertain how well DUNE can test the limits of the three-massive-neutrinos paradigm. In this way, we briefly explore whether light sterile neutrinos can serve as proxies for other, in principle unknown, phenomena that might manifest themselves in long-baseline neutrino oscillation experiments.

  2. CONTRACTOR REPORT SAND927005

    E-Print Network [OSTI]

    CONTRACTOR REPORT SAND92­7005 Unlimited Release UC­261 Fatigue of Fiberglass Wind Turbine Blade . #12;Distribution CategoryUC-261 SAND92-7005 UnlimitedRelease PrintedAugust 1992 FATIGUE OF FIBERGLASS

  3. Last Stand For Empire: Leo Amery and Imperial Preference 

    E-Print Network [OSTI]

    Freeman, William David

    1998-01-01

    The life and career of Leo Amery are examined with respect to the subject of Imperial Preference. The paper explores Amery's intellectual development and the motivations behind his life-long championing of greater economic unity for the British...

  4. Sand Simulation Abhinav Golas

    E-Print Network [OSTI]

    Lin, Ming C.

    Sand Simulation Abhinav Golas COMP 768 - Physically Based Simulation Final Project Presentation May (Wikipedia) Size variation from 1m to icebergs Food grains, sand, coal etc. Powders ­ can be suspended 6, 2009 9 0I #12;Understanding the behavior Why can sand sustain shear stress? Friction between

  5. Radar scattering of linear dunes and mega-yardangs: Application to Titan

    E-Print Network [OSTI]

    Paillou, Philippe; Radebaugh, Jani; Wall, Stephen

    2015-01-01

    The Ku-band (13.8 GHz - 2.2 cm) RADAR instrument onboard the Cassini-Huygens spacecraft has revealed the richness of the surface of Titan, as numerous seas, lakes, rivers, cryo-volcanic flows and vast dune fields have been discovered. Linear dunes are a major geomorphological feature present on Titan, covering up to 17% of its surface, mainly in equatorial regions. However, the resolution of the RADAR instrument is not good enough to allow a detailed study of the morphology of these features. In addition, other linear wind-related landforms, such as mega-yardangs (linear wind-abraded ridges formed in cohesive rocks), are likely to present a comparable radar signature that could be confused with the one of dunes. We conducted a comparative study of the radar radiometry of both linear dunes and mega-yardangs, based on representative terrestrial analogues: the linear dunes located in the Great Sand Sea in western Egypt and in the Namib Desert in Namibia, and the mega-yardangs observed in the Lut Desert in easter...

  6. A scaling law for aeolian dunes on Mars, Venus, Earth, and for subaqueous ripples

    E-Print Network [OSTI]

    Philippe Claudin; Bruno Andreotti

    2006-08-07

    The linear stability analysis of the equations governing the evolution of a flat sand bed submitted to a turbulent shear flow predicts that the wavelength $\\lambda$ at which the bed destabilises to form dunes should scale with the drag length $L_{\\rm drag} = \\frac{\\rho_s}{\\rho_f} d$. This scaling law is tested using existing and new measurements performed in water (subaqueous ripples), in air (aeolian dunes and fresh snow dunes), in a high pressure CO$_2$ wind tunnel reproducing conditions close to the Venus atmosphere and in the low pressure CO$_2$ martian atmosphere (martian dunes). A difficulty is to determine the diameter of saltating grains on Mars. A first estimate comes from photographs of aeolian ripples taken by the rovers Opportunity and Spirit, showing grains whose diameters are smaller than on Earth dunes. In addition we calculate the effect of cohesion and viscosity on the dynamic and static transport thresholds. It confirms that the small grains visualised by the rovers should be grains experiencing saltation. Finally, we show that, within error bars, the scaling of $\\lambda$ with $L_{\\rm drag}$ holds over almost five decades. We conclude with a discussion on the time scales and velocities at which these bed instabilities develop and propagate on Mars.

  7. Riding Waves of Dissent: Counter-Imperial Impulses in the Age of Fuller and Melville 

    E-Print Network [OSTI]

    Lawrence, Nicholas M.

    2010-10-12

    imperialism. The chapter concludes by arguing that Cooper established an initial narrative formulation that sought to suppress counter-imperial impulses within a mainline triumphalist vision. Chapter II examines Fuller's first published book, Summer...

  8. Topics in non-equilibrium statistical mechanics Greg Pavliotis (Imperial College London)

    E-Print Network [OSTI]

    Pavliotis, Grigorios

    Topics in non-equilibrium statistical mechanics Greg Pavliotis (Imperial College London) Dates: MON and calculation of transport coefficients #12;

  9. Crescent Dunes | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTIONRobertsdale, Alabama (Utility Company)|Alabama: EnergyPennsylvania: EnergyCounty, Oklahoma:Dunes

  10. The song of the dunes as a self-synchronized instrument

    E-Print Network [OSTI]

    S. Douady; A. Manning; P. Hersen; H. Elbelrhiti; S. Protiere; A. Daerr; B. Kabbachi

    2006-01-28

    Since Marco Polo (1) it has been known that some sand dunes have the peculiar ability of emitting a loud sound with a well defined frequency, sometimes for several minutes. The origin of this sustained sound has remained mysterious, partly because of its rarity in nature (2). It has been recognized that the sound is not due to the air flow around the dunes but to the motion of an avalanche (3), and not to an acoustic excitation of the grains but to their relative motion (4-7). By comparing several singing dunes and two controlled experiments, one in the laboratory and one in the field, we here demonstrate that the frequency of the sound is the frequency of the relative motion of the sand grains. The sound is produced because some moving grains synchronize their motions. The existence of a velocity threshold in both experiments further shows that this synchronization comes from an acoustic resonance within the flowing layer: if the layer is large enough it creates a resonance cavity in which grains self-synchronize.

  11. DUNE

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submit theCovalent Bonding Low-Cost2 DOE HQSiteo n n eDPFJ.D.DRIVINGServices »

  12. Internal geometry of sand waves: a comparison between modern and fossil examples

    SciTech Connect (OSTI)

    Berne, S.; Homewood, P.

    1988-08-01

    Recent developments in acquiring and processing very high-resolution geophysical data help us better understand large subtidal sand waves of the French continental shelf. They are compared with ancient analogs, especially from the Miocene Swiss Molasse. Internal structure, interpreted from seismic sections, vibracorings, and large outcrops, shows a hierarchy comparable to aeolian dunes. (1) Steep (25/degree/-30/degree/) reflectors, dipping leeward, are interpreted as foreset beds. Vibracoring shows that in modern cases they consist of alternating layers of medium- and coarse-grained sand, similar to those produced by sand avalanching. These deposits give the highest porosity values in the central body of the sand wave. They are comparable to the Miocene sand waves of the Swiss Molasse. (2) Erosional reflectors, dipping at lower angles cut across the foresets, are interpreted as reactivation surfaces created by high-energy events (equinox tides, added tidal and wave effects) rather than by the semidiurnal currents occasionally preserved in fossil sand waves. (3) Subhorizontal reflectors were probably created by truncation of sand waves during major storms. Fossil analogs more like larger present-day sand waves might be difficult to recognize due to the complex internal architecture of the sand body.

  13. Basaltic island sand provenance

    SciTech Connect (OSTI)

    Marsaglia, K.M. . Dept. of Geological Sciences)

    1992-01-01

    The Hawaiian Islands are an ideal location to study basaltic sand provenance in that they are a series of progressively older basaltic shield volcanoes with arid to humid microclimates. Sixty-two sand samples were collected from beaches on the islands of Hawaii, Maui, Oahu and Kauai and petrographically analyzed. The major sand components are calcareous bioclasts, volcanic lithic fragments, and monomineralic grains of dense minerals and plagioclase. Proportions of these components vary from island to island, with bioclastic end members being more prevalent on older islands exhibiting well-developed fringing reef systems and volcanic end members more prevalent on younger, volcanically active islands. Climatic variations across the island of Hawaii are reflected in the percentage of weathered detritus, which is greater on the wetter, northern side of the island. The groundmass of glassy, basaltic lithics is predominantly black tachylite, with lesser brown sideromelane; microlitic and lathwork textures are more common than holohyaline vitric textures. Other common basaltic volcanic lithic fragments are holocrystalline aggregates of silt-sized pyroxene or olivine, opaque minerals and plagioclase. Sands derived from alkalic lavas are texturally and compositionally indistinguishable from sands derived from tholeiitic lavas. Although Hawaiian basaltic sands overlap in composition with magmatic arc-derived sands in terms of their relative QFL, QmPK and LmLvLs percentages, they are dissimilar in that they lack felsic components and are more enriched in lathwork volcanic lithic fragments, holocrystalline volcanic lithic fragments, and dense minerals.

  14. Transformation of barchans into parabolic dunes under the

    E-Print Network [OSTI]

    Harting, Jens

    Transformation of barchans into parabolic dunes under the influence of vegetation O.Duran, H.Tsoar, V.Schatz & H.Herrmann #12;Introduction Parabolic dunes: Barchan dunes: #12;Transformation of parabolic dunes into barchans and viceversa Introduction #12;Models vnvnv hthhth +=++ )()( 1 (1) t hhH dt dh

  15. SAND20096226 Unlimited Release

    E-Print Network [OSTI]

    Plimpton, Steve

    SAND2009­6226 Unlimited Release Printed October 2009 Crossing the Mesoscale No-Man's Land via method and its variants are powerful tools for modeling materials at the mesoscale, meaning at length

  16. The Timeless Sands 

    E-Print Network [OSTI]

    Finch, Sandra

    1986-01-01

    The petroleum engineering literature clearly shows that large proppant volumes and concentrations are required to effectively stimulate low-permeability gas sands. To pump large proppant concentrations, one must use a viscous fluid. However, many...

  17. Dune field pattern formation and recent transporting winds in the Olympia Undae Dune Field, north polar region of Mars

    E-Print Network [OSTI]

    Bourke, Mary C.

    Dune field pattern formation and recent transporting winds in the Olympia Undae Dune Field, north dune crestlines, with apparent slipfaces on the primary crests, ubiquitous wind ripples, areas of coarsegrained wind ripples, and deflated interdune areas. Geomorphic evidence and dune field pattern analysis

  18. Summary of the DUNE Mission Concept

    E-Print Network [OSTI]

    Refregier, Alexandre

    2008-01-01

    The Dark UNiverse Explorer (DUNE) is a wide-field imaging mission concept whose primary goal is the study of dark energy and dark matter with unprecedented precision. To this end, DUNE is optimised for weak gravitational lensing, and also uses complementary cosmolo gical probes, such as baryonic oscillations, the integrated Sachs-Wolf effect, a nd cluster counts. Immediate additional goals concern the evolution of galaxies, to be studied with groundbreaking statistics, the detailed structure of the Milky Way and nearby galaxies, and the demographics of Earth-mass planets. DUNE is a medium class mission consisting of a 1.2m telescope designed to carry out an all-sky survey in one visible and three NIR bands (1deg$^2$ field-of-view) which will form a unique legacy for astronomy. DUNE has been selected jointly with SPACE for an ESA Assessment phase which has led to the Euclid merged mission concept.

  19. Summary of the DUNE Mission Concept

    E-Print Network [OSTI]

    Alexandre Refregier; Marian Douspis; the DUNE collaboration

    2008-07-25

    The Dark UNiverse Explorer (DUNE) is a wide-field imaging mission concept whose primary goal is the study of dark energy and dark matter with unprecedented precision. To this end, DUNE is optimised for weak gravitational lensing, and also uses complementary cosmolo gical probes, such as baryonic oscillations, the integrated Sachs-Wolf effect, a nd cluster counts. Immediate additional goals concern the evolution of galaxies, to be studied with groundbreaking statistics, the detailed structure of the Milky Way and nearby galaxies, and the demographics of Earth-mass planets. DUNE is a medium class mission consisting of a 1.2m telescope designed to carry out an all-sky survey in one visible and three NIR bands (1deg$^2$ field-of-view) which will form a unique legacy for astronomy. DUNE has been selected jointly with SPACE for an ESA Assessment phase which has led to the Euclid merged mission concept.

  20. www.imperial.ac.uk/rajivgandhicentre Imperial College London and the Rajiv Gandhi Centre would like to thank founding Patrons: BP Foundation, The Kusuma Trust

    E-Print Network [OSTI]

    www.imperial.ac.uk/rajivgandhicentre Imperial College London and the Rajiv Gandhi Centre would like of focus are: · Energy · Health & Healthcare · Digital Economy · Urban Development (Transportation, Water Strategy · Entrepreneurship and Global Growth What We Offer The Rajiv Gandhi Centre is well

  1. Steam Men, Edisons, Connecticut Yankees: Technocracy and Imperial Identity in Nineteenth-Century American Fiction

    E-Print Network [OSTI]

    Williams, Nathaniel Langdon

    2010-12-31

    the mobility needed to reach new territories and the military advantage needed to control populations. Moreover, it contributes to an imperial mindset by 6 fostering in technology users a sense of superiority that justifies and legitimates the imperial... that complicates and sometimes confounds their function as allegories of nation- or empire-building. While they may have fostered an imperial view in an indirect way, their narrative particulars feature elements that resist or complicate outright nationalism...

  2. Movement of tagged dredged sand at thalweg disposal sites in the Upper Mississippi River. Volume 3. Additional results at Gordon's Ferry and Whitney Island sites

    SciTech Connect (OSTI)

    McCown, D.L.; Paddock, R.A.

    1985-04-01

    During routine channel maintenance, hydraulically dredged sand was tagged with sand coated with fluorescent dye before being deposited as a pile in the thalweg at three sites on the Upper Mississippi River. As discussed in the first two volumes of this report, bathymetry was measured and surface sediments were sampled to study changes in the topography of the disposal pile and the downstream movement of the tagged sand. At all three sites, topographic evidence of the pile disappeared after the first period of high river flow, which was followed by redevelopment of dunes in the disposal area. The tagged sand did not migrate into nearby border areas, backwaters, or sloughs, remaining in the main channel as it moved downstream. This volume presents the results of additional surveys at the Gordon's Ferry and Whitney Island sites. At Gordon's Ferry, 25 bottom cores were taken to examine the three-dimensional distribution of tagged sand in the bottom sediments. The core analyses indicated that much of the tagged sand had been incorporated into the dune structure and that it resided primarily in the crests of the dunes.

  3. White Sands Reservation

    E-Print Network [OSTI]

    Laughlin, Robert B.

    .S. Departments of Energy and the Interior for Use in preparation of their Programmatic Environmental Impact Sands National Monument New Mexico Lincoln National Forest Mescalero Apache Reservation 54 82 54 54 70 Cruces New Mexico Solar Energy Study Areas in New Mexico Map Prepared June 5, 2009 Property of the U

  4. Introduction Sand sole, Psettichthys melanostictus,

    E-Print Network [OSTI]

    67(4) 9 Introduction Sand sole, Psettichthys melanostictus, is a common nearshore pleuronectid flat- fish in the northeast Pacific Ocean.Also known as fringe sole, spotted flounder, or sand flounder catches (Kramer et al., 1995). Commercial landings of sand sole in California, Oregon, and Wash- ington

  5. EIS-0454: Tonopah Solar Energy Crescent Dunes Solar Energy Project...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    EIS-0454: Tonopah Solar Energy Crescent Dunes Solar Energy Project in Nye County, NV EIS-0454: Tonopah Solar Energy Crescent Dunes Solar Energy Project in Nye County, NV Documents...

  6. Lunette dunes and yardangs of the Carson desert, Nevada: Implications for Holocene eolian activity in the northern Great Basin

    SciTech Connect (OSTI)

    Lancaster, N. (Desert Research Inst., Reno, NV (United States). Quaternary Sciences Center)

    1993-04-01

    A large complex of lunette dunes consisting of two and locally three ridges up to 40 m high occurs on the northeast margin of the Carson Sink playa. The outer, or north-easterly, ridge consists of a core of fine and coarse and partially cemented by saline clay and silt (Unit 1) with avalanche face cross-beds dipping to the north-east at 25--30[degree], as well as planar sets of wind ripple laminae with dips to both the northeast and west at 2--5[degree]. Overlying this unit on the crest and lee side of the ridge is 2--5 m of mobile poorly sorted, very fine and coarse sand that forms an active avalanche face up to 25 m high on the east side of the ridge (Unit 3). At a number of localities, the indurated core of the larger dune ridge is carved into yardanges, or streamlined small hills with a lemniscate shape that result from wind erosion of homogeneous sediments. The dunes overlie, with an erosional contact, Late Pleistocene saline lacustrine clays of paleolake Lahontan. They represent at least two episodes of mid- to late-Holocene deflation of sediments from the Carson Sink playa. Erosion of the dunes and yardang formation suggests: (1) termination of sediment supply from the playa as a result of reduced sediment supply and runoff from the Carson River, (2) cementation of the dunes by clay and silt accumulation, and (3) modern eolian erosion through flow acceleration on dune windward slopes.

  7. Imperialism and the Emerging White State in the Early Colony of Virginia 

    E-Print Network [OSTI]

    Becker, Stuart David

    2014-05-08

    What accounts for the reality of U.S. imperialism and race today? How, and to what extent, is today’s system of racial domination and U.S. imperialism prefigured by the early English colonization of Virginia during the ...

  8. Modeling emergent large-scale structures of barchan dune fields

    E-Print Network [OSTI]

    Claudin, Philippe

    Modeling emergent large-scale structures of barchan dune fields S. Worman , A.B. Murray , R, barchan dunes typically exist as members of larger fields that display strik- ing, enigmatic structures that cannot be readily explained by examining the dynamics at the scale of single dunes, or by appealing

  9. Spectroscopic Studies of Nearby Cool Stars: The DUNES Sample

    E-Print Network [OSTI]

    Complutense de Madrid, Universidad

    Spectroscopic Studies of Nearby Cool Stars: The DUNES Sample J. Maldonado , R. M. Martínez of our sample will be observed by DUNES, a Herschel OTKP aiming at detecting and studying cold, faint of the kinematics of the DUNES sample. Keywords: stars, fundamental parameters, kinematic, age PACS: 97.10.-q 97

  10. Friday, March 27, 2009 MARS: DUNES, DUST, AND WIND

    E-Print Network [OSTI]

    Rathbun, Julie A.

    Friday, March 27, 2009 MARS: DUNES, DUST, AND WIND 8:30 a.m. Waterway Ballroom 1 Chairs: Lori Fenton Steve Metzger 8:30 a.m. Chojnacki M. * Moersch J. E. Valles Marineris Dune Fields: Thermophysical Properties, Morphology, and Provenance [#2486] We examined 25 dune fields in Valles Marineris to identify

  11. Climate and coastal dune vegetation: disturbance, recovery, and succession

    E-Print Network [OSTI]

    Miller, Thomas E.

    Climate and coastal dune vegetation: disturbance, recovery, and succession Thomas E. Miller Æ Elise. Foredune, interdune, and backdune habitats common to most coastal dunes have very different vegetation deterministic trajectories. Keywords Dune habitats Á Succession Á Disturbance Á Coastal vegetation Á Hurricane Á

  12. Imperial Beach, California: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QAsource History View NewTexas: Energy Resources JumpNewTexas:HydrothermallyIFBIdeaEnergy InformationImperial

  13. Imperial-Enlow, Pennsylvania: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QAsource History View NewTexas: Energy Resources JumpNewTexas:HydrothermallyIFBIdeaEnergyFacility |Imperial-Enlow,

  14. Imperial Valley Renewable Energy Summit | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i nA Guide to TappingWORKof71CommercialThisImperial Valley Geothermal

  15. Geothermal Development in Imperial County | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIXsource History View New Pages Recent Changes All SpecialGeothermal Developmentin Imperial

  16. PP-90-1 Imperial Irrigation District | Department of Energy

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousMathematicsEnergyInterested PartiesBuilding energy codes have a moreINCREASES5-24690-1 Imperial Irrigation

  17. Particle dynamics of a cartoon dune

    E-Print Network [OSTI]

    Christopher Groh; Ingo Rehberg; Christof A. Kruelle

    2009-11-04

    The spatio-temporal evolution of a downsized model for a desert dune is observed experimentally in a narrow water flow channel. A particle tracking method reveals that the migration speed of the model dune is one order of magnitude smaller than that of individual grains. In particular, the erosion rate consists of comparable contributions from creeping (low energy) and saltating (high energy) particles. The saltation flow rate is slightly larger, whereas the number of saltating particles is one order of magnitude lower than that of the creeping ones. The velocity field of the saltating particles is comparable to the velocity field of the driving fluid. It can be observed that the spatial profile of the shear stress reaches its maximum value upstream of the crest, while its minimum lies at the downstream foot of the dune. The particle tracking method reveals that the deposition of entrained particles occurs primarily in the region between these two extrema of the shear stress. Moreover, it is demonstrated that the initial triangular heap evolves to a steady state with constant mass, shape, velocity, and packing fraction after one turnover time has elapsed. Within that time the mean distance between particles initially in contact reaches a value of approximately one quarter of the dune basis length.

  18. Moving dunes on the Google Earth

    E-Print Network [OSTI]

    Sparavigna, Amelia Carolina

    2013-01-01

    Several methods exist for surveying the dunes and estimate their migration rate. Among methods suitable for the macroscopic scale, the use of the satellite images available on Google Earth is a convenient resource, in particular because of its time series. Some examples of the use of this feature of Google Earth are here proposed.

  19. Compressive behavior of fine sand.

    SciTech Connect (OSTI)

    Martin, Bradley E.; Kabir, Md. E.; Song, Bo; Chen, Wayne

    2010-04-01

    The compressive mechanical response of fine sand is experimentally investigated. The strain rate, initial density, stress state, and moisture level are systematically varied. A Kolsky bar was modified to obtain uniaxial and triaxial compressive response at high strain rates. A controlled loading pulse allows the specimen to acquire stress equilibrium and constant strain-rates. The results show that the compressive response of the fine sand is not sensitive to strain rate under the loading conditions in this study, but significantly dependent on the moisture content, initial density and lateral confinement. Partially saturated sand is more compliant than dry sand. Similar trends were reported in the quasi-static regime for experiments conducted at comparable specimen conditions. The sand becomes stiffer as initial density and/or confinement pressure increases. The sand particle size become smaller after hydrostatic pressure and further smaller after dynamic axial loading.

  20. Temporal and spatial variability of ooid sand shoals: Comparison of Mississippian of Kentucky and Quaternary of Bahamas

    SciTech Connect (OSTI)

    Boardman, M.R. (Miami Univ., Oxford, OH (USA))

    1989-08-01

    An examination of the lithology and topography of Andros Island, Bahamas, reveals it is a Pleistocene ooid sand shoal. A comparison with Joulters Cays (a modern ooid sand shoal directly to the north) shows that much of the original depositional topography is preserved through at least one cycle of sea level highstand and lowstand. Both the Pleistocene and the Holocene ooid sand bodies are a few kilometers to tens of kilometers wide. The total vertical relief of a single episode of Quaternary ooid sand deposition is more than 10 m and includes accumulation in tidal channels, shallow flat areas, and eolian dunes. Today, much of Andros Island is within 2 m of present sea level and is the site of a belt several kilometers wide consisting of muddy tidal flat sediments overlying an exposure surface. The site of ooid sand deposition and shoal complex formation is not continuous along shorelines, especially windward margins, but shifts abruptly along the margins of platforms as a result of minor fluctuations of sea level. Thus, it should be expected that ooid sand shoals (ancient and modern) should be in direct lateral and vertical contact with lagoons, tidal flats, and reefs. The Mississippian Slade Formation contains many of the features of Quaternary ooid sand accumulation: abrupt vertical and lateral gradations between oolitic grainstones, packstones, and lime mudstones, vertical relief of individual oolitic sedimentary packages up to 30 m (perhaps with eolian dunes) and numerous exposure surfaces of varying intensities. These characteristics suggest that this formation represents a time of rapid fluctuations of relative sea level and abrupt shifts in the sites of ooid sand shoal complexes.

  1. Sand2004-1111

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report:Speeding access toSmall ReactorRaymondScientificScientific and TechnicalSAND

  2. Sand2004-6066

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTechtail. (Conference) | SciTech ConnectDiagnosticsScientific andKentucky. SemiannualSAND

  3. Canadian Oil Sands: Canada An Emerging Energy

    E-Print Network [OSTI]

    Boisvert, Jeff

    , the expectations regarding oil sands productive capacity, the assumption that all land disturbed by Syncrude1 Canadian Oil Sands: Canada ­ An Emerging Energy Superpower 0 University of Alberta February 8 Oil Sands Limited ("Canadian Oil Sands"), Syncrude Canada Ltd. ("Syncrude") and the oil sands industry

  4. Plant geography of coastal sand dune vegetation of the Tamaulipan Biotic Province 

    E-Print Network [OSTI]

    Baro de Jones, Deborah Maria

    1992-01-01

    . The recorded species belong to 40 families and 116 genera. The three families with greatest species diversity were Fabaceae (18. 0/, ), Asteracee (17. 3/o), and Poaceae (15. 8%%d). The following plant species range patterns were found: endemics (6. 0'/o... the Tamaulipan Biotic Province along the Tamaulipas Coast, Mexico . . . . . . . . . . . . . . . . . . . . . . . . . . 5 6 8 . . . 12 . 16 IV Plant Community Sampling and Data Analysis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Soil...

  5. Particle dynamics of a cartoon dune

    E-Print Network [OSTI]

    Groh, Christopher; Kruelle, Christof A

    2009-01-01

    The spatio-temporal evolution of a downsized model for a desert dune is observed experimentally in a narrow water flow channel. A particle tracking method reveals that the migration speed of the model dune is one order of magnitude smaller than that of individual grains. In particular, the erosion rate consists of comparable contributions from creeping (low energy) and saltating (high energy) particles. The saltation flow rate is slightly larger, whereas the number of saltating particles is one order of magnitude lower than that of the creeping ones. The velocity field of the saltating particles is comparable to the velocity field of the driving fluid. It can be observed that the spatial profile of the shear stress reaches its maximum value upstream of the crest, while its minimum lies at the downstream foot of the dune. The particle tracking method reveals that the deposition of entrained particles occurs primarily in the region between these two extrema of the shear stress. Moreover, it is demonstrated that...

  6. Imperial Nationalism: Nationalism and the Empire in late nineteenth century Scotland and British Canada 

    E-Print Network [OSTI]

    Colclough, Kevin

    2007-01-01

    The relationship between imperialism and nationalism has often been portrayed by theorists of nationalism and post colonial discourse theorists as antagonistic. Anti-democratic, aggressive empires impose their will on ...

  7. Model for a dune field with exposed water table

    E-Print Network [OSTI]

    Marco Cesar M. de M. Luna; Eric J. R. Parteli; Hans J. Herrmann

    2011-09-01

    Aeolian transport in coastal areas can be significantly affected by the presence of an exposed water table. In some dune fields, such as in Len\\c{c}\\'ois Maranhenses, northeastern Brazil, the water table oscillates in response to seasonal changes of rainfall and rates of evapotranspiration, rising above the ground during the wet season and sinking below in the dry period. A quantitative understanding of dune mobility in an environment with varying groundwater level is essential for coastal management as well as for the study of long-term evolution of many dune fields. Here we apply a model for aeolian dunes to study the genesis of coastal dune fields in presence of an oscillating water table. We find that the morphology of the field depends on the time cycle, $T_{\\mathrm{w}}$, of the water table and the maximum height, $H_{\\mathrm{w}}$, of its oscillation. Our calculations show that long chains of barchanoids alternating with interdune ponds such as found at Len\\c{c}\\'ois Maranhenses arise when $T_{\\mathrm{w}}$ is of the order of the dune turnover time, whereas $H_{\\mathrm{w}}$ dictates the growth rate of dune height with distance downwind. We reproduce quantitatively the morphology and size of dunes at Len\\c{c}\\'ois Maranhenses, as well as the total relative area between dunes.

  8. Texas General Land Office Construction Certificate and Dune Protection...

    Open Energy Info (EERE)

    OpenEI Reference LibraryAdd to library PermittingRegulatory Guidance - Checklist: Texas General Land Office Construction Certificate and Dune Protection Permit Requirements...

  9. Mineral resources and mineral resource potential of the Panamint Dunes Wilderness Study Area, Inyo County, California

    SciTech Connect (OSTI)

    Kennedy, G.L.; Kilburn, J.E.; Conrad, J.E.; Leszcykowski, A.M.

    1984-01-01

    This report presents the results of a mineral survey of the Panamint Dunes Wilderness Study Area (CDCA-127), California Desert Conservation Area, Inyo County, California. The Panamint Dunes Wilderness Study Area has an identified volcanic cinder resource and few areas with mineral resource potential. Hydrothermal deposits of lead-zinc-silver occur in veins and small replacement bodies along and near the Lemoigne thrust fault on the eastern side of the wilderness study area. Two workings, the Big Four mine with 35,000 tons of inferred subeconomic lead-zinc-silver resources and a moderate potential for additional resources, and the Apple 1 claim with low potential for lead-zinc-silver resources, are surrounded by the study area but are specifically excluded from it. A low resource potential for lead-zinc-silver is assigned to other exposures along the Lemoigne thrust, although metallic minerals were not detected at these places. The Green Quartz prospect, located near the northern tip of the study area, has low resource potential for copper in quartz pegmatities in quartz monzonite of the Hunter Mountain batholith. Nonmetallic mineral resources consist of volcanic cinders and quartz sand. An estimated 900,000 tons of inferred cinder reserves are present at Cal Trans borrow pit MS 242, on the southern margin of the study area. The Panamint Valley dune field, encompassing 480 acres in the north-central part of the study area, has only low resource potential for silica because of impurities. Other sources of silica and outside the study area are of both higher purity and closer to possible markets. 19 refs., 2 figs., 1 tab.

  10. Discrete Element Method simulations of the saturation of aeolian sand transport

    E-Print Network [OSTI]

    Pähtz, Thomas; Carneiro, Marcus V; Araújo, Nuno A M; Herrmann, Hans J

    2015-01-01

    The saturation length of aeolian sand transport ($L_s$), characterizing the distance needed by wind-blown sand to adapt to changes in the wind shear, is essential for accurate modeling of the morphodynamics of Earth's sandy landscapes and for explaining the formation and shape of sand dunes. In the last decade, it has become a widely-accepted hypothesis that $L_s$ is proportional to the characteristic distance needed by transported particles to reach the wind speed (the ``drag length''). Here we challenge this hypothesis. From extensive numerical Discrete Element Method simulations, we find that, for medium and strong winds, $L_s\\propto V_s^2/g$, where $V_s$ is the saturated value of the average speed of sand particles traveling above the surface and $g$ the gravitational constant. We show that this proportionality is consistent with a recent analytical model, in which the drag length is just one of four similarly important length scales relevant for sand transport saturation.

  11. Discrete Element Method simulations of the saturation of aeolian sand transport

    E-Print Network [OSTI]

    Thomas Pähtz; Amir Omeradži?; Marcus V. Carneiro; Nuno A. M. Araújo; Hans J. Herrmann

    2015-03-13

    The saturation length of aeolian sand transport ($L_s$), characterizing the distance needed by wind-blown sand to adapt to changes in the wind shear, is essential for accurate modeling of the morphodynamics of Earth's sandy landscapes and for explaining the formation and shape of sand dunes. In the last decade, it has become a widely-accepted hypothesis that $L_s$ is proportional to the characteristic distance needed by transported particles to reach the wind speed (the ``drag length''). Here we challenge this hypothesis. From extensive numerical Discrete Element Method simulations, we find that, for medium and strong winds, $L_s\\propto V_s^2/g$, where $V_s$ is the saturated value of the average speed of sand particles traveling above the surface and $g$ the gravitational constant. We show that this proportionality is consistent with a recent analytical model, in which the drag length is just one of four similarly important length scales relevant for sand transport saturation.

  12. Regional aeolian dynamics and sand mixing in the Gran Desierto: Evidence from Landsat thematic mapper images

    SciTech Connect (OSTI)

    Blount, G.; Greeley, R.; Christensen, P.R. (Arizona State Univ., Tempe (USA)); Smith, M.O.; Adams, J.B. (Univ. of Washington, Seattle (USA))

    1990-09-10

    Spatial variations in sand composition were mapped on a regional scale in a terrestrial sand sea, the Gran Desierto of Sonora, Mexico. Mesoscale mapping on a satellite image base allowed quantitative interpretation of the dynamic development of sand sheets and dunes. The results were used to interpret the Quaternary geologic history of the tectonically active region at the mouth of the Colorado River. Landsat thematic mapper multispectral images were used to predict the abundance of different mineralogies of sand grains in a mixed aeolian terrain. A spectral mixing model separated the effects of vegetation and topographically induced shading and shadow from the effects produced by different mineral and rock types. Compositions determined remotely agreed well with samples from selected areas within the spectral limitations of the thematic mapper. A simple discrimination capability for active versus inactive sand surfaces is demonstrated based upon differences in the percentage of low-albedo accessory grains occurring on dormant aeolian surfaces. A technique for discriminating between low-albedo materials and macroscopic shade is implemented by combing thermal images with the results of the spectral mixing model. The image analysis revealed important compositional variations over large areas that were not readily apparent in the field.

  13. Prehistoric Pipes from the Olds Ferry Dunes Site (10-WN-557), Western Idaho

    E-Print Network [OSTI]

    Pavesic, Max G

    2000-01-01

    Pipes from the Olds Ferry Dunes Site (lO-WN-557), Westernremains at the Olds Ferry Dunes site (lO-WN-557, Fig. 1)Pavesic 1985). Olds Ferry Dunes is one of several pivotal

  14. Madsen and Schmitt: Buzz-Cut Dune and Fremont Foraging at the Margin of Horticulture

    E-Print Network [OSTI]

    Janetski, Joel C

    2006-01-01

    backdrop for the Buzz-Cut Dune data. The contextualizationstrategies using Buzz-Cut Dune data. Field methods as wellwithin 3.2 km. of Buzz-Cut Dune, which demonstrated the

  15. Stromatolites, ooid dunes, hardgrounds, and crusted mud beds, all products of marine cementation and microbial mats in subtidal oceanic mixing zone on eastern margin of Great Bahama Bank

    SciTech Connect (OSTI)

    Dill, R.F.; Kendall, C.S.C.G.; Steinen, R.P.

    1989-03-01

    The interisland channels along the eastern margin of the Great Bahamas Bank contain lithified structures that owe their origin to recent marine cementation. This cementation appears to be commonly associated with a complex microbial community of plants and microorganisms living within a bank-margin oceanographic mixing zone. In this region, reversing tidal and wind-driven currents flow up to 3 knots (150 cm/sec) three hours out of each six-hour tidal period. Here, marine-cement crusted, carbonate mud beds are found interbedded within migrating ooid sand bars and dunes and are associated with growing, lithified stromatolites up to 2 m in height. These laminated mud beds are found with thicknesses of up to 1 m in subtidal depths of 4 to 8 m (12 to 25 ft). The muds appear to be homogeneous, but closer examination by SEM and under a microscope reveals they are composed of pelletoid aggregates of needle-shaped aragonite crystals with diameters of up to 50 ..mu... The size of these soft pellets is similar to the smaller grains of ooid sands that are abundant in the area. This size similarity could explain why both the mud beds are found in similar high-energy hydraulic regimes as the ooid sands, but does not suggest how or why the aggregates of pure aragonite needles form. A high production of ooid sand within this bank margin environment permits the formation of natural levees along the margins of tidal channels. The back sides of these levees are being lithified by marine cements to form hardgrounds. Skeletal and ooid sand dunes stabilized by Thallasia in channel bottoms also are becoming lithified. Grapestones form at the distributaries of flood tidal deltas of ooid sand. All of these features have a common attribute: they are continually in contact with the turbulent mixing-zone waters.

  16. The Performance of Power and the Administration of Justice: Capital Punishment and the Case Review System in Late Imperial China

    E-Print Network [OSTI]

    Poling, Kathleen Margaret

    2012-01-01

    and Imperial Administration. Durham: Duke University Press,of Power and the Administration of Justice: Capitalof Power and the Administration of Justice: Capital

  17. The Impact of Empire on the North American Woman Suffrage Movement: Suffrage Racism in an Imperial Context

    E-Print Network [OSTI]

    Sneider, Allison L.

    1994-01-01

    of the National Suffrage Racism in an Imperial ContextSuffrage Movement: Suffrage Racism The Impact of Empire onbe- ginnings, to the racism which characterizes the later

  18. Animating Sand as a Fluid Yongning Zhu

    E-Print Network [OSTI]

    Fournier, John J.F.

    Animating Sand as a Fluid by Yongning Zhu B.Sc., Peking University, 2003 A THESIS SUBMITTED;Abstract My thesis presents a physics-based simulation method for animating sand. To allow for efficiently scaling up to large volumes of sand, we abstract away the individual grains and think of the sand

  19. Laboratory compaction of cohesionless sands 

    E-Print Network [OSTI]

    Delphia, John Girard

    1998-01-01

    A total of 62 cohesiveness sands were tested to rographics. investigate the importance of the water content, grain size distribution, grading of the soil, particle shape, grain crushing during testing and laboratory compaction test method...

  20. EA-2013: Herbicide Application at Three Substations; Imperial County

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:FinancingPetroleum Based|Department of Energy 8:Final78: SandDepartment

  1. Seasonal sand level changes on southern california beaches

    E-Print Network [OSTI]

    Yates, Marissa L.

    2009-01-01

    2.3 Sand level measurements . . . . . .2.4 Sand level changes . . . . . . . . . . 2.5 Wave4.3.2 Sand level observations . . . . . . . . . . . . . .

  2. Seasonal Sand Level Changes on Southern California Beaches

    E-Print Network [OSTI]

    Yates, Marissa L

    2009-01-01

    2.3 Sand level measurements . . . . . .2.4 Sand level changes . . . . . . . . . . 2.5 Wave4.3.2 Sand level observations . . . . . . . . . . . . . .

  3. Spectroscopic study of the Moses Lake dune field, Washington: Determination of compositional distributions and source lithologies

    E-Print Network [OSTI]

    Bandfield, Joshua L.

    Spectroscopic study of the Moses Lake dune field, Washington: Determination of compositional Coulee, dune samples, and clast deposits. Factor analysis, target transformation, and end-member recovery techniques were applied to the set of dune samples as well as a set of grain size fractions. The dune sample

  4. Invasive grasses, climate change, and exposure to storm-wave overtopping in coastal dune ecosystems

    E-Print Network [OSTI]

    Invasive grasses, climate change, and exposure to storm-wave overtopping in coastal dune ecosystems result in increased risk of flooding in coastal areas. In the Pacific Northwest (USA), coastal dunes and reducing dune height. Here we quantify the relative exposure to storm-wave induced dune overtopping posed

  5. A scaling law for aeolian dunes on Mars, Venus, Earth, and for subaqueous ripples

    E-Print Network [OSTI]

    Claudin, Philippe

    A scaling law for aeolian dunes on Mars, Venus, Earth, and for subaqueous ripples Philippe Claudin to a turbulent shear flow predicts that the wavelength at which the bed destabilises to form dunes should scale in water (subaqueous ripples), in air (aeolian dunes and fresh snow dunes), in a high pressure CO2 wind

  6. Modeling removal of bacteriophages MS2 and PRD1 by dune recharge at Castricum, Netherlands

    E-Print Network [OSTI]

    Hassanizadeh, S. Majid

    Modeling removal of bacteriophages MS2 and PRD1 by dune recharge at Castricum, Netherlands Jack F by dune recharge was studied at a field site in the dune area of Castricum, Netherlands. Recharge water at investigating virus removal processes during dune recharge, are presented. In the Netherlands, about 14

  7. In rivers, ripples and dunes are patterns at two well-separated wavelengths , that are respectively

    E-Print Network [OSTI]

    Claudin, Philippe

    In rivers, ripples and dunes are patterns at two well-separated wavelengths , that are respectively role of the free surface, we evidence that river dunes can not form from a linear instability. Finally, we discuss a non-linear criterion for the selection of the size of dunes and mega-dunes. 1 A VERY

  8. PLANT ASSEMBLAGE STRUCTURE ON BARRIER ISLAND `PIMPLE' DUNES AT THE VIRGINIA COAST RESERVE

    E-Print Network [OSTI]

    Lawrence, Deborah

    PLANT ASSEMBLAGE STRUCTURE ON BARRIER ISLAND `PIMPLE' DUNES AT THE VIRGINIA COAST RESERVE LONG ASSEMBLAGE STRUCTURE ON BARRIER ISLAND `PIMPLE' DUNES AT THE VIRGINIA COAST RESERVE LONG-TERM ECOLOGICAL', small, rounded dunes forming along main dune ridges of the barrier islands. There are distinct plant

  9. Two modes for dune orientation -Supplementary information Sylvain Courrech du Pont,1,

    E-Print Network [OSTI]

    Narteau, Clément

    Two modes for dune orientation - Supplementary information Sylvain Courrech du Pont,1, Cl flux over a linear dune 1 B. Bed Instability 2 C. Dune fingering 4 D. Wind speed-up 5 E. Discussion 6 II. Experiments 9 A. Dunes underwater 9 B. Experimental setup 10 C. Orientation, amplitude

  10. Corridors of barchan dunes: Stability and size selection P. Hersen,1

    E-Print Network [OSTI]

    Corridors of barchan dunes: Stability and size selection P. Hersen,1 K. H. Andersen,2 H. Elbelrhiti 29 January 2004 Barchans are crescentic dunes propagating on a solid ground. They form dune fields in the shape of elongated corridors in which the size and spacing between dunes are rather well selected. We

  11. Comment on "Minimal size of a barchan dune" B. Andreotti and P. Claudin

    E-Print Network [OSTI]

    Claudin, Philippe

    Comment on "Minimal size of a barchan dune" B. Andreotti and P. Claudin Laboratoire de Physique et Received 23 May 2007; published 21 December 2007 It is now an accepted fact that the size at which dunes of the typical dune wavelength on Mars 650 m on the basis of which they refute the scaling of the dune size

  12. Using Long-Term Census Data to Inform Restoration Methods for Coastal Dune Vegetation

    E-Print Network [OSTI]

    Ronquist, Fredrik

    Using Long-Term Census Data to Inform Restoration Methods for Coastal Dune Vegetation Elise S Barrier Island . Coastal ecology . Dune zone . Disturbance . Dune vegetation . Storm response Introduction), with varied results. Restoration strategies can be difficult to implement successfully in coastal dune systems

  13. P. J. Antsaklis, "Notes on Polynomial Matrix Representation of Linear Control Systems," Publication No. 80/17, Dept. of Electrical Engineering, Imperial College, June 1980.

    E-Print Network [OSTI]

    Antsaklis, Panos

    No. 80/17, Dept. of Electrical Engineering, Imperial College, June 1980. #12;P. J. Antsaklis, "Notes of Linear Control Systems," Publication No. 80/17, Dept. of Electrical Engineering, Imperial College, June," Publication No. 80/17, Dept. of Electrical Engineering, Imperial College, June 1980. #12;P. J. Antsaklis

  14. Three-Dimensional and Multi-Temporal Dune-Field Pattern Analysis in the Olympia Undae Dune Field, Mars 

    E-Print Network [OSTI]

    Middlebrook, William David

    2015-07-14

    , and dune cross-strata were measured via heads up digitization in a geographic information system (GIS) according to the methods of Ewing et al., 2006 (Figure 4). Every identified primary and secondary dune crestline in HiRISE image ESP_027713... spline with a cell size of 1, a weight of 5 and 12 points per region. The surface was then subtracted from the original DTM to create a raster of dune heights above the interdunal surface. Slope and aspect were calculated using standard ArcGIS...

  15. Methane storms as a driver of Titan's dune orientation

    E-Print Network [OSTI]

    Charnay, Benjamin; Rafkin, Scot; Narteau, Clément; Lebonnois, Sébastien; Rodriguez, Sébastien; Pont, Sylvain Courrech du; Lucas, Antoine

    2015-01-01

    Titan's equatorial regions are covered by eastward propagating linear dunes. This direction is opposite to mean surface winds simulated by Global Climate Models (GCMs), which are oriented westward at these latitudes, similar to trade winds on Earth. Different hypotheses have been proposed to address this apparent contradiction, involving Saturn's gravitational tides, large scale topography or wind statistics, but none of them can explain a global eastward dune propagation in the equatorial band. Here we analyse the impact of equinoctial tropical methane storms developing in the superrotating atmosphere (i.e. the eastward winds at high altitude) on Titan's dune orientation. Using mesoscale simulations of convective methane clouds with a GCM wind profile featuring superrotation, we show that Titan's storms should produce fast eastward gust fronts above the surface. Such gusts dominate the aeolian transport, allowing dunes to extend eastward. This analysis therefore suggests a coupling between superrotation, tro...

  16. Onsite Wastewater Treatment Systems: Sand Filters 

    E-Print Network [OSTI]

    Lesikar, Bruce J.

    2008-10-23

    Sand filters are beds of granular material, or sand, drained from underneath so that pretreated wastewater can be treated, collected and distributed to a land application system. This publication explains the treatment, design, operation...

  17. SANDIA REPORT SAND872461 q UC60

    E-Print Network [OSTI]

    \\ .i SANDIA REPORT SAND87­2461 q UC­60 Unlimited Release Printed April 1988 Modal Testing Springfield, VA 22161 NTIS price codes Printed copy: A02 Microfiche copy AO1 u ., #12;SAND87 ­ 2461 Unlimited

  18. SANDIA REPORT SAND2012-1000

    E-Print Network [OSTI]

    Tesfatsion, Leigh

    SANDIA REPORT SAND2012-1000 Unlimited Release Printed September 2012 Project Report: A Survey · · UNITED STATES OF AM ERICA 2 #12;SAND2012-1000 Unlimited Release Printed September 2012 Project Report

  19. SANDIA REPORT SAND930731 s UC706

    E-Print Network [OSTI]

    Kansas, University of

    SANDIA REPORT SAND93­0731 s UC­706 Unlimited Release Printed March 1993 Spaceborne SAR Study: LDRD, VA 22161 NTIS price codes Printed copy A06 Microfiche copy AO1 #12;SAND93-0731 Unlimited Release

  20. SANDIA REPORT SAND2001-1642

    E-Print Network [OSTI]

    SANDIA REPORT SAND2001-1642 Unlimited Release Printed June 2001 LIST/BMI Turbines Instrumentation)605-6900 E-Mail: orders@ntis.fedworld.gov Online order: http://www.ntis.gov/ordering.htm #12;SAND2001

  1. SANDIA REPORT SAND2001-0643

    E-Print Network [OSTI]

    Ho, Cliff

    SANDIA REPORT SAND2001-0643 Unlimited Release Printed March 2001 Review of Chemical Sensors for In, VA 22161 NTIS price codes Printed copy: A03 Microfiche copy: A01 #12;iii SAND2001-0643 Unlimited

  2. SANDIA REPORT SAND89-1396

    E-Print Network [OSTI]

    SANDIA REPORT SAND89-1396 · UC-905 Unlimited Release Printed September 1989 8232 codes Printed copy: A08 Microfiche copy: A01 #12;Distribution Category UC-905 SAND89-1396 Unlimited

  3. Compression and Creep of Venice Lagoon Sands

    E-Print Network [OSTI]

    Sanzeni, Alex

    A laboratory test program was conducted to evaluate the one-dimensional (1D) compression and creep properties of intact sand (and silty-sand) samples from a deep borehole at the Malamocco Inlet to the Venice Lagoon. The ...

  4. The Time of Sands: Quartz-rich Sand Deposits as a Renewable Resource

    E-Print Network [OSTI]

    Shaffer, Nelson R.

    2006-01-01

    Sand: Glassmaking: Containers Flat, plate and window Specialty Fiberglass, unground Fiberglass, ground Foundry:

  5. The Dark UNiverse Explorer (DUNE): Proposal to ESA's Cosmic Vision

    E-Print Network [OSTI]

    Alexandre Refregier; the DUNE collaboration

    2008-07-24

    The Dark UNiverse Explorer (DUNE) is a wide-field space imager whose primary goal is the study of dark energy and dark matter with unprecedented precision. For this purpose, DUNE is optimised for the measurement of weak gravitational lensing but will also provide complementary measurements of baryonic accoustic oscillations, cluster counts and the Integrated Sachs Wolfe effect. Immediate auxiliary goals concern the evolution of galaxies, to be studied with unequalled statistical power, the detailed structure of the Milky Way and nearby galaxies, and the demographics of Earth-mass planets. DUNE is an Medium-class mission which makes use of readily available components, heritage from other missions, and synergy with ground based facilities to minimise cost and risks. The payload consists of a 1.2m telescope with a combined visible/NIR field-of-view of 1 deg^2. DUNE will carry out an all-sky survey, ranging from 550 to 1600nm, in one visible and three NIR bands which will form a unique legacy for astronomy. DUNE will yield major advances in a broad range of fields in astrophysics including fundamental cosmology, galaxy evolution, and extrasolar planet search. DUNE was recently selected by ESA as one of the mission concepts to be studied in its Cosmic Vision programme.

  6. Treating tar sands formations with karsted zones

    DOE Patents [OSTI]

    Vinegar, Harold J. (Bellaire, TX); Karanikas, John Michael (Houston, TX)

    2010-03-09

    Methods for treating a tar sands formation are described herein. The tar sands formation may have one or more karsted zones. Methods may include providing heat from one or more heaters to one or more karsted zones of the tar sands formation to mobilize fluids in the formation. At least some of the mobilized fluids may be produced from the formation.

  7. Development of stresses in cohesionless poured sand

    E-Print Network [OSTI]

    Claudin, Philippe

    Development of stresses in cohesionless poured sand By M. E. Cates1 , J. P. Wittmer1 , J a conical sandpile, created by pouring sand from a point source onto a rough rigid support, shows) is required for systems with two-dimensional symmetry, such as a wedge of sand; for a three

  8. Animating Sand as a Fluid Yongning Zhu

    E-Print Network [OSTI]

    Teschner, Matthias

    Animating Sand as a Fluid Yongning Zhu University of British Columbia Robert Bridson University of British Columbia Figure 1: The Stanford bunny is simulated as water and as sand. Abstract We present a physics-based simulation method for animating sand. To allow for efficiently scaling up to large volumes

  9. Les laboratoires de recherche L'Universit du Maine dispose d'une diversit et d'une qualit de la recherche qui s'adosse

    E-Print Network [OSTI]

    Di Girolami, Cristina

    Les laboratoires de recherche L'Université du Maine dispose d'une diversité et d'une qualité de la associés au CNRS et jouissent d'une reconnaissance nationale et internationale. L'Université du Maine'Université du Maine : * des Unités Mixtes de Recherche (UMR) : entité administrative créée par la signature d

  10. Strategy & Planning Division Imperial College Statistics Pocket Guide 2000-01

    E-Print Network [OSTI]

    Strategy & Planning Division Imperial College Statistics Pocket Guide 2000-01 1 Index Page Full-Time Student Numbers 2 Part-Time Student Numbers 3 Full-Time Equivalent Students by Department: 2000-01 4 FTE Staff Numbers and Student:Staff Rations: 2000-01 5 Applications and Admissions: Undergraduate 6

  11. Issue 273 5 june 2014 Sharing stories of Imperial's community robot revolution

    E-Print Network [OSTI]

    it contributing to global warming. On the other, natural gas can provide global energy security at a time when are at a crossroads when it comes to fossil fuels including natural gas. On the one hand there are concerns about ' s co r n e re d i to r ' s co r n e r Sustainable Gas Institute launches at Imperial a centre

  12. The Genetic Impact of Aztec Imperialism: Ancient Mitochondrial DNA Evidence From Xaltocan, Mexico

    E-Print Network [OSTI]

    Kemp, Brian M.

    The Genetic Impact of Aztec Imperialism: Ancient Mitochondrial DNA Evidence From Xaltocan, Mexico that the Aztecs annexed numerous polities in the Basin of Mexico over the following years, the demographic of the Toltec state in the 12th century prompted the emergence of numerous city-states in the Basin of Mexico

  13. Strategy & Planning Division Imperial College Statistics Pocket Guide 2001-02

    E-Print Network [OSTI]

    Strategy & Planning Division Imperial College Statistics Pocket Guide 2001-02 1 Index Page Full-Time Student Numbers 2 Part-Time Student Numbers 3 Full-Time Equivalent Students by Department: 2001-02 4 FTE Staff Numbers and Student:Staff Rations: 2001-02 5 Applications and Admissions: Undergraduate 6

  14. Direct seismic energy modeling and application to the 1979 Imperial Valley earthquake

    E-Print Network [OSTI]

    Archuleta, Ralph

    ]. The second is the seismic energy that relates to the dynamics of the rupture process. However, seismic energy]. This limits our general knowledge on the mechanical process of the rupture: no reliable catalog of seismicDirect seismic energy modeling and application to the 1979 Imperial Valley earthquake Pascal

  15. Strategy & Planning Division Imperial College Statistics Pocket Guide 1999-00

    E-Print Network [OSTI]

    Strategy & Planning Division Imperial College Statistics Pocket Guide 1999-00 1 Index Page Full-Time Student Numbers 2 Part-Time Student Numbers 3 Full-Time Equivalent Students by Department: 1999-00 3 FTE Staff Numbers and Student:Staff Rations: 1999-00 4 Applications and Admissions: Undergraduate 5

  16. Alternative muon frontend for the International Design Study (IDS) A. Alekou, Imperial College, London, UK

    E-Print Network [OSTI]

    McDonald, Kirk

    Alternative muon front­end for the International Design Study (IDS) A. Alekou, Imperial College discuss alternative designs of the muon capture front end of the Neutrino Factory International Design measurements of neutrino oscillation parame­ ters. The present paper discusses alternative muon capture

  17. The Dark UNiverse Explorer (DUNE): Proposal to ESA's Cosmic Vision

    E-Print Network [OSTI]

    Refregier, Alexandre

    2008-01-01

    The Dark UNiverse Explorer (DUNE) is a wide-field space imager whose primary goal is the study of dark energy and dark matter with unprecedented precision. For this purpose, DUNE is optimised for the measurement of weak gravitational lensing but will also provide complementary measurements of baryonic accoustic oscillations, cluster counts and the Integrated Sachs Wolfe effect. Immediate auxiliary goals concern the evolution of galaxies, to be studied with unequalled statistical power, the detailed structure of the Milky Way and nearby galaxies, and the demographics of Earth-mass planets. DUNE is an Medium-class mission which makes use of readily available components, heritage from other missions, and synergy with ground based facilities to minimise cost and risks. The payload consists of a 1.2m telescope with a combined visible/NIR field-of-view of 1 deg^2. DUNE will carry out an all-sky survey, ranging from 550 to 1600nm, in one visible and three NIR bands which will form a unique legacy for astronomy. DUNE...

  18. Numerical modeling of the wind flow over a transverse dune

    E-Print Network [OSTI]

    Ascânio D. Araújo; Eric J. R. Parteli; Thorsten Poeschel; José S. Andrade Jr.; Hans J. Herrmann

    2013-09-30

    Transverse dunes, which form under unidirectional winds and have fixed profile in the direction perpendicular to the wind, occur on all celestial objects of our solar system where dunes have been detected. Here we perform a numerical study of the average turbulent wind flow over a transverse dune by means of computational fluid dynamics simulations. We find that the length of the zone of recirculating flow at the dune lee --- the {\\em{separation bubble}} --- displays a surprisingly strong dependence on the wind shear velocity, $u_{\\ast}$: it is nearly independent of $u_{\\ast}$ for shear velocities within the range between $0.2\\,$m$$s and $0.8\\,$m$$s but increases linearly with $u_{\\ast}$ for larger shear velocities. Our calculations show that transport in the direction opposite to dune migration within the separation bubble can be sustained if $u_{\\ast}$ is larger than approximately $0.39\\,$m$$s, whereas a larger value of $u_{\\ast}$ (about $0.49\\,$m$$s) is required to initiate this reverse transport.

  19. Numerical modeling of the wind flow over a transverse dune

    E-Print Network [OSTI]

    Araújo, Ascânio D; Poeschel, Thorsten; Andrade, José S; Herrmann, Hans J

    2013-01-01

    Transverse dunes, which form under unidirectional winds and have fixed profile in the direction perpendicular to the wind, occur on all celestial objects of our solar system where dunes have been detected. Here we perform a numerical study of the average turbulent wind flow over a transverse dune by means of computational fluid dynamics simulations. We find that the length of the zone of recirculating flow at the dune lee --- the {\\em{separation bubble}} --- displays a surprisingly strong dependence on the wind shear velocity, $u_{\\ast}$: it is nearly independent of $u_{\\ast}$ for shear velocities within the range between $0.2\\,$m$$s and $0.8\\,$m$$s but increases linearly with $u_{\\ast}$ for larger shear velocities. Our calculations show that transport in the direction opposite to dune migration within the separation bubble can be sustained if $u_{\\ast}$ is larger than approximately $0.39\\,$m$$s, whereas a larger value of $u_{\\ast}$ (about $0.49\\,$m$$s) is required to initiate this reverse transport.

  20. Model for a dune field with exposed water table

    E-Print Network [OSTI]

    Luna, Marco Cesar M de M; Herrmann, Hans J

    2011-01-01

    Aeolian transport in coastal areas can be significantly affected by the presence of an exposed water table. In some dune fields, such as in Len\\c{c}\\'ois Maranhenses, northeastern Brazil, the water table oscillates in response to seasonal changes of rainfall and rates of evapotranspiration, rising above the ground during the wet season and sinking below in the dry period. A quantitative understanding of dune mobility in an environment with varying groundwater level is essential for coastal management as well as for the study of long-term evolution of many dune fields. Here we apply a model for aeolian dunes to study the genesis of coastal dune fields in presence of an oscillating water table. We find that the morphology of the field depends on the time cycle, $T_{\\mathrm{w}}$, of the water table and the maximum height, $H_{\\mathrm{w}}$, of its oscillation. Our calculations show that long chains of barchanoids alternating with interdune ponds such as found at Len\\c{c}\\'ois Maranhenses arise when $T_{\\mathrm{w}...

  1. “The Territory Facing Jaffa”: Cultural Landscapes of a Mediterranean Port and its Hinterland (ca. 2000–539 B.C.E.)

    E-Print Network [OSTI]

    Pierce, George Allen

    2015-01-01

    E. Rishon Le- Þiyyon Sand Dunes. Excavations and Surveys in1993 Rishon Le Þiyyon Sand Dunes. Excavations and Surveys in2000 Rishon Le- Þiyyon Sand Dunes. Hadashot Arkheologiyot–

  2. Ground-Dwelling Arthropod and Small Mammal Responses to Anthropogenic Disturbances Within Southern California Deserts: From Plant Invasions to Altered Fire Regimes

    E-Print Network [OSTI]

    Hulton VanTassel, Heather Lynn

    2015-01-01

    selected California sand dunes. Bureau of Land Management,Coachella Valley sand dunes, Coleoptera: (Tenebrionidae).schemes within a desert sand dune landscape. Journal of Arid

  3. Comment on "Relevant Length Scale of Barchan Dunes"

    E-Print Network [OSTI]

    Klaus Kroy; Xiang Guo

    2004-04-05

    In a recent experimental breakthrough, Hersen et al. [1] demonstrated that by changing the agitating medium from air to water, one can obtain, on laboratory scale, dunes that are downsized copies of desert dunes, thereby overcoming a major obstacle for their systematic study. Here we argue in two steps (i),(ii) that an alternative data analysis leads to some conclusions that are qualitatively and quantitatively different from Hersen et al.'s but justify their similarity hypothesis on different grounds. [1] P. Hersen, S. Douady, and B. Andreotti, Phys. Rev. Lett. 89 (2002) 264301

  4. Oil sands processes-affected water treatment Research field: Oil sands processes-affected water treatment

    E-Print Network [OSTI]

    Milgram, Paul

    Oil sands processes-affected water treatment Research field: Oil sands processes-affected water., to make the system work as desired. We have experimental projects on oil extraction, polymers, fluid

  5. Assessment of geothermal development in the Imperial Valley of California. Volume 2. Environmental control technology

    SciTech Connect (OSTI)

    Morris, W.; Hill, J.

    1980-07-01

    Environmental control technologies are essential elements to be included in the overall design of Imperial Valley geothermal power systems. Environmental controls applicable to abatement of hydrogen sulfide emissions, cooling tower drift, noise, liquid and solid wastes, and induced subsidence and seismicity are assessed here. For optimum abatement of H{sub 2}S under a variety of plant operating conditions, removal of H{sub 2}S upstream of the steam turbine is recommended. The environmental impact of cooling tower drift will be closely tied to the quality of cooling water supplies. Conventional noise abatement procedures can be applied and no special research and development are needed. Injection technology constitutes the primary and most essential environmental control and liquid waste disposal technology for Imperial Velley geothermal operations. Subsurface injection of fluids is the primary control for managing induced subsidence. Careful maintenance of injection pressure is expected to control induced seismicity. (MHR)

  6. Environmental assessmental, geothermal energy, Heber geothermal binary-cycle demonstration project: Imperial County, California

    SciTech Connect (OSTI)

    Not Available

    1980-10-01

    The proposed design, construction, and operation of a commercial-scale (45 MWe net) binary-cycle geothermal demonstration power plant are described using the liquid-dominated geothermal resource at Heber, Imperial County, California. The following are included in the environmental assessment: a description of the affected environment, potential environmental consequences of the proposed action, mitigation measures and monitoring plans, possible future developmental activities at the Heber anomaly, and regulations and permit requirements. (MHR)

  7. The fluid dynamics of river dunes: A review and some future research directions

    E-Print Network [OSTI]

    Venditti, Jeremy G.

    The fluid dynamics of river dunes: A review and some future research directions Jim Best Earth; revised 14 October 2005; accepted 20 October 2005; published 21 December 2005. [1] Dunes are present, and deposition within many rivers. Progress in understanding the fluid dynamics associated with alluvial dunes

  8. Reply to "Comment on `Minimal size of a barchan dune' " E. J. R. Parteli,1

    E-Print Network [OSTI]

    Claudin, Philippe

    Reply to "Comment on `Minimal size of a barchan dune' " E. J. R. Parteli,1 O. Durán,2 and H. J. Rev. E 75, 011301 2007 . We show that the equations of the dune model used in our calcula- tions are self-consistent and effectively lead to a dependence of the minimal dune size on the wind speed through

  9. A 3 km atmospheric boundary layer on Titan indicated by dune spacing and Huygens data

    E-Print Network [OSTI]

    Claudin, Philippe

    Note A 3 km atmospheric boundary layer on Titan indicated by dune spacing and Huygens data Ralph D a b s t r a c t Some 20% of Titan's surface is covered in large linear dunes that resemble parameter limiting the growth of giant dunes, namely the boundary layer thickness (Andreotti et al., 2009

  10. 38 BULLETIN O F THE UNITED STATES FISH COMMISSION. 11.-HOW TO QTBENGTHENTHE DUNES.*

    E-Print Network [OSTI]

    38 BULLETIN O F THE UNITED STATES FISH COMMISSION. 11.-HOW TO QTBENGTHENTHE DUNES.* B y 6. ROECK. Iu au article on the formation of the dunes, in No; 33 of the Deutsolie lf art can do nothing or but little to resist the force of the shifting dune." This often

  11. DUNES: A PerformanceOriented System Support Environment for Dependency Maintenance in Workstation Networks \\Lambda

    E-Print Network [OSTI]

    Park, Kihong

    DUNES: A Performance­Oriented System Support Environment for Dependency Maintenance in Workstation of performance fea­ tures, their properties, and implementation in a sys­ tem support environment called DUNES where both communication and computation costs are explicitly taken into account. DUNES' architecture

  12. LONG TERM RESIDUAL EFFECTS OF A NUTRIENT ADDITION ON A BARRIER ISLAND DUNE ECOSYSTEM

    E-Print Network [OSTI]

    Lawrence, Deborah

    LONG TERM RESIDUAL EFFECTS OF A NUTRIENT ADDITION ON A BARRIER ISLAND DUNE ECOSYSTEM by Susan M EFFECTS OF A NUTRIENT ADDITION ON A BARRIER ISLAND DUNE ECOSYSTEM Susan M. Heyel Old Dominion University, 2000 Director: Dr. Frank P. Day In 1991, 150 m2 were fertilized with nitrogen on three dunes on Hog

  13. A Software Framework for Reduced Basis Methods using DUNE-RB and RBMATLAB

    E-Print Network [OSTI]

    Haasdonk, Bernard

    A Software Framework for Reduced Basis Methods using DUNE-RB and RBMATLAB Martin Drohmann, Bernard for a large class of discretizations of evolution equations implemented in DUNE. The ap- proach provides software package RBMATLAB, respectively DUNE-RB. The functionality of the framework is exemplified

  14. A generic grid interface for parallel and adaptive scientific Part II: implementation and tests in DUNE

    E-Print Network [OSTI]

    Bastian, Peter

    and tests in DUNE P. Bastian1 M. Blatt1 A. Dedner2 C. Engwer1 R. Kl¨ofkorn2 R. Kornhuber4 M. Ohlberger3 O performance losses. The imple- mentation is realized as part of the software environment DUNE [10]. Numerical, 65Y05, 68U20 Key words: DUNE, hierarchical grids, software, abstract interface, generic programming

  15. Coherent Flow Structures and Suspension Events over Low-angle Dunes: Fraser River,

    E-Print Network [OSTI]

    Venditti, Jeremy G.

    Coherent Flow Structures and Suspension Events over Low-angle Dunes: Fraser River, Canada by Ryan) Title of Thesis: Coherent Flow Structures and Suspension Events over Low-angle Dunes: Fraser River Licence #12;iv Abstract It is increasingly obvious that dunes with low-angle lee-sides (

  16. Interisland Variability of Dune Plant Community Structure on Virginia's Barrier Islands

    E-Print Network [OSTI]

    Lawrence, Deborah

    Interisland Variability of Dune Plant Community Structure on Virginia's Barrier Islands by Justin VARIABILITY OF DUNE PLANT COMMUNITY STRUCTURE ON VIRGINIA'S BARRIER ISLANDS Justin K. Shafer Old Dominion provide an opportunity to study interisland variability of dune plant communities. My research focused

  17. SIMULATION OF THE EFFECT OF WIND SPEEDUP IN THE FORMA-TION OF TRANSVERSE DUNE FIELDS

    E-Print Network [OSTI]

    Carretero, Ricardo

    SIMULATION OF THE EFFECT OF WIND SPEEDUP IN THE FORMA- TION OF TRANSVERSE DUNE FIELDS HIROSHI 21 February 2000; Accepted 25 February 2000 ABSTRACT A computer simulation model for transverse-dune distinct problems were found regarding the cross-sectional dune shape, namely

  18. Global mapping and characterization of Titan's dune fields with Cassini: Correlation between RADAR and VIMS observations

    E-Print Network [OSTI]

    Narteau, Clément

    Global mapping and characterization of Titan's dune fields with Cassini: Correlation between RADAR dunes have been observed in the equatorial regions of Titan, Saturn's largest moon. As the Cassini-resolution coverage of Titan's surface increases, revealing new dune fields and allowing refinements

  19. The Kailua Community Survey Results and Implications for the Kailua Beach and Dune Management Plan

    E-Print Network [OSTI]

    The Kailua Community Survey Results and Implications for the Kailua Beach and Dune Management Plan to Pay Connections to the Kailua Beach and Dune Management Plan Next Steps Appendices Appendix and revetments public and private property Figure 6. Protecting beach dunes on the basis of ecology and economics

  20. Modelling of dune patterns by short range interactions Clement Narteau, Eric Lajeunesse, Francois Metivier & Olivier Rozier

    E-Print Network [OSTI]

    Narteau, Clément

    Modelling of dune patterns by short range interactions Cl´ement Narteau, Eric Lajeunesse, Franc on crescentic barchan dunes that are used as a benchmark for our numerical model of bedforms. Length and time scales of isolated barchan dunes are studied in order to constrain the parameters of the model. Then we

  1. Morphological barrier island changes and recovery of dunes after Hurricane Dennis, St. George Island, Florida

    E-Print Network [OSTI]

    Fagherazzi, Sergio

    Morphological barrier island changes and recovery of dunes after Hurricane Dennis, St. George September 2009 Keywords: Dune recovery LiDAR Overwash Hurricane Dennis Barrier island During the summer of the barrier island are analyzed, along with the short-term post-storm recovery of secondary dunes. Results

  2. Mars Global Digital Dune Database and initial science results Rosalyn K. Hayward,1

    E-Print Network [OSTI]

    Bourke, Mary C.

    Mars Global Digital Dune Database and initial science results Rosalyn K. Hayward,1 Kevin F. Mullins 20 November 2007. [1] A new Mars Global Digital Dune Database (MGD3 ) constructed using Thermal of the geographic distribution of moderate- to large-size dune fields (area >1 km2 ) that will help researchers

  3. Shrubs as ecosystem engineers in a coastal dune: influences on plant populations, communities and ecosystems

    E-Print Network [OSTI]

    Cushman, J. Hall

    Shrubs as ecosystem engineers in a coastal dune: influences on plant populations, communities the landscape? Location: Coastal hind-dune system, Bodega Head, northern California. Methods: In each of 4 years dune. At landscape level, the two shrubs ­ and their distinctive vegetation and soils ­ frequently had

  4. Decline of Birds in a Human Modified Coastal Dune Forest Landscape in South Africa

    E-Print Network [OSTI]

    Pretoria, University of

    @zoology.up.ac.za Introduction Coastal dune forest is one of South Africa's rarest vegetation types; restricted to the easternDecline of Birds in a Human Modified Coastal Dune Forest Landscape in South Africa Morgan J modified coastal dune forest landscape in northern KwaZulu-Natal, South Africa. However, occurrence does

  5. technology offer SandTES -High Temperature Sand Thermal Energy Storage

    E-Print Network [OSTI]

    Szmolyan, Peter

    technology offer SandTES - High Temperature Sand Thermal Energy Storage key words: High Temperature Energy Storage | Fluidized Bed | Sand | The invention consists of a fluidized bed with internal heat together with Dr. Eisl of ENRAG GmbH. Background Thermal energy storage (TES) systems are essential

  6. Bedforms in a turbulent stream.Part 2: Formation of ripples by primary linear instability and of dunes by non-linear pattern coarsening

    E-Print Network [OSTI]

    A. Fourrière; P. Claudin; B. Andreotti

    2008-11-14

    It is widely accepted that both ripples and dunes form in rivers by primary linear instability, the wavelength of the former scaling on the grain size, that of the latter being controled by the water depth. We revisit here this problem, using the computation of the turbulent flow over a wavy bottom performed in Part 1. The details of the different mechanisms controlling sediment transport are encoded into three quantities: the saturated flux, the saturation length and the threshold shear stress. Theses quantities are modelled in the case of erosion and momentum limited bed loads. This framework allows to give a clear picture of the instability in terms of dynamical mechanisms. The relation between the wavelength at which ripples form and the flux saturation length is quantitatively derived. Inverting the problem, experimental data is used to determine the saturation length as a function of grain size and shear velocity. Finally, using the systematic expansion of the flow field with respect to the corrugation amplitude, we discuss the non-linear selection of ripple aspect ratio. Investingating the effect of a free surface on the linear instability, we show that the excitation of standing waves at the surface has a stabilising effect, independently of the details of the flow and sediment transport models. Consequently, the shape of the dispersion relation is such that dunes can not result from a primary linear instability. We present the results of field experiments performed in the natural sandy Leyre river, which evidence the formation of ripples by a linear instability and the formation of dunes by a non-linear pattern coarsening limited by the free surface. We show that mega-dunes form when the sand bed presents heterogeneities such as a wide distribution of grain sizes.

  7. J.B. PENDRY -CURRICULUM VITAE Address:Department of Physics, Imperial College London, Prince Consort Road, London SW7 2AZ, UK

    E-Print Network [OSTI]

    Pendry, John

    , Prince Consort Road, London SW7 2AZ, UK telephone: 020-7594-7606 email: j.pendry@imperial.ac.uk Date

  8. Numerical and analytical modeling of sanding onset prediction 

    E-Print Network [OSTI]

    Yi, Xianjie

    2004-09-30

    To provide technical support for sand control decision-making, it is necessary to predict the production condition at which sand production occurs. Sanding onset prediction involves simulating the stress state on the surface of an oil/gas producing...

  9. Preliminary relative permeability estimates of methane hydrate-bearing sand

    E-Print Network [OSTI]

    Seol, Yongkoo; Kneafsey, Timothy J.; Tomutsa, Liviu; Moridis, George J.

    2006-01-01

    through methane hydrate-bearing sand. X-ray CT was usedin partially saturated sand, 229th ACS National Meeting, SanOF METHANE HYDRATE- BEARING SAND Yongkoo Seol, Timothy J.

  10. EFFECTS of OIL MIXED with CARBONIZED SAND

    E-Print Network [OSTI]

    m #12;#12;EFFECTS of OIL MIXED with CARBONIZED SAND on AQUATIC ANIMALS Marine Biological l Albert M. Day, Director Special Scientific Report - Fisheries No. 1 EFFECTS OF OIL MIXED WITH CARBONIZED CONTENT Pago Preface Introduction 1 Injury to aquatic life caused by oil. 2 Amount of carbonized sand

  11. SANDIA REPORT SAND 2004-0001

    E-Print Network [OSTI]

    SANDIA REPORT SAND 2004-0001 Unlimited Release Printed January 2004 Estimation Of Fatigue@ntis.fedworld.gov Online order: http://www.ntis.gov/help/ordermethods.asp?loc=7-4-0#online #12;SAND 2004-0001 Unlimited Release Printed January 2004 ESTIMATION OF FATIGUE AND EXTREME LOAD DISTRIBUTIONS FROM LIMITED DATA

  12. SANDIA REPORT SAND2013-5131

    E-Print Network [OSTI]

    SANDIA REPORT SAND2013-5131 Unlimited Release July 2013 DOE/EPRI 2013 Electricity Storage Handbook. #12;DOE/EPRI 2013 Electricity Storage Handbook in Collaboration with NRECA Issued by Sandia National/EPRI 2013 Electricity Storage Handbook in Collaboration with NRECA SAND2013-5131 Unlimited Release July 2013

  13. SANDIA REPORT SAND2013-1185

    E-Print Network [OSTI]

    Systems, Inc. to develop and test a novel photovoltaic (PV) arc- fault detection system. The systemSANDIA REPORT SAND2013-1185 Unlimited Release Printed February 2013 Preliminary Photovoltaic Arc://www.ntis.gov/help/ordermethods.asp?loc=7-4-0#online #12;3 SAND2013-1185 Unlimited Release Printed February 2013 Preliminary Photovoltaic

  14. SAND80-2646 UnlimitedRelease

    E-Print Network [OSTI]

    SAND80-2646 UnlimitedRelease UC-60 Vertical Axis Wind Turbine Drive Train Transient Dynamics David #12;SAND80-2646 Vertical Axis Wind Turbine Drive Train Transient Dynamics* David B. Clauss Thomas G-up of a vertical axis wind turbine causes transient torque oscillations in the drive train with peak torques which

  15. SANDIA REPORT SAND2005-0336

    E-Print Network [OSTI]

    Ho, Cliff

    SANDIA REPORT SAND2005-0336 Unlimited Release Printed Month/Year FY04 Field Evaluations of an In@ntis.fedworld.gov Online order: http://www.ntis.gov/help/ordermethods.asp?loc=7-4-0#online 2 #12;SAND2005-0336 Unlimited

  16. SANDIA REPORT SAND2004-4596

    E-Print Network [OSTI]

    Ho, Cliff

    SANDIA REPORT SAND2004-4596 Unlimited Release Printed September 2004 Sensors for Environmental@ntis.fedworld.gov Online order: http://www.ntis.gov/help/ordermethods.asp?loc=7-4-0#online 2 #12;SAND2004-4596 Unlimited

  17. SANDIA REPORT SAND2013-2789

    E-Print Network [OSTI]

    Tesfatsion, Leigh

    SANDIA REPORT SAND2013-2789 Printed April 2013 New Wholesale Power Market Design Using Linked://www.ntis.gov/help/ordermethods.asp?loc=7-4-0#online DEPA RTMENT OF EN ERGY · · UNITED STATES OF AM ERICA 2 #12;SAND2013-2789 Unlimited

  18. SANDIA REPORT SAND2002-0771

    E-Print Network [OSTI]

    SANDIA REPORT SAND2002-0771 Unlimited Release Printed March 2002 FATIGUE OF COMPOSITE MATERIALS;SAND2002-0771 Unlimited Release Printed March2002 Fatigue of Composite Materials and Substructures Materials Fatigue Program from 1997to 2001, andis intendedto be usedin conjunction with theDOEMSU Composite

  19. The origin and fate of the sediments composing a migrating dune field, Amagansett, NY

    SciTech Connect (OSTI)

    Maher, T. (Suffolk Community Coll., Selden, NY (United States). Environmental Science Dept.); Kandelin, J. (Suffolk Community Coll., Selden, NY (United States). Dept. of Earth and Space Science); Black, J.A. (Geosciences Inc., Patchogue, NY (United States))

    1993-03-01

    The migrating dune system, located in Amagansett, NY, consists of a series of three parabolic dunes ranging in heights from 10 to 30 meters. The dunes are migrating under the influence of the prevailing winds, in a southeasterly direction. The migration continues until the dunes encounter the countervailing prevailing winds, off the Atlantic Ocean. A series of flow charts have been prepared to indicate the possible sources of sediment for this system. These charts, in conjunction with geomorphic analysis, stratigraphic data and various sediment characteristics indicate that the sediments are transported by coastal currents. Once deposited they form a linear dune system. Eolian transport from this dune then supplies the sediment to the migrating dune system.

  20. PUBLISHED ONLINE: 24 JUNE 2012 | DOI: 10.1038/NGEO1503 Morphology and dynamics of star dunes from

    E-Print Network [OSTI]

    Narteau, Clément

    dunes from numerical modelling Deguo Zhang1 , Clément Narteau1 *, Olivier Rozier1 and Sylvain Courrech du Pont2 * Star dunes are giant, pyramid-shaped dunes composed of interlaced arms. These arms suggest that the star dunes form as a result of complex interactions between a multidirectional wind

  1. Recent aeolian dune change on Mars M.C. Bourke a,b,, K.S. Edgett c

    E-Print Network [OSTI]

    Bourke, Mary C.

    Recent aeolian dune change on Mars M.C. Bourke a,b,, K.S. Edgett c , B.A. Cantor c a Planetary 2007 Abstract Previous comparisons of Martian aeolian dunes in satellite images have not detected any change in dune form or position. Here, we show dome dunes in the north polar region that shrank

  2. P. J. Antsaklis, "Polynomial Matrix Characterization Using Characteristic Values and Vectors," Publication No. 80/18, Dept. of Electrical Engineering, Imperial College, July 1980.

    E-Print Network [OSTI]

    Antsaklis, Panos

    ," Publication No. 80/18, Dept. of Electrical Engineering, Imperial College, July 1980. #12;P. J. Antsaklis. of Electrical Engineering, Imperial College, July 1980. #12;P. J. Antsaklis, "Polynomial Matrix Characterization Using Characteristic Values and Vectors," Publication No. 80/18, Dept. of Electrical Engineering

  3. Ec101 Selected Topics in Economics: The Economy and the State in Late Imperial China, T, Th 1--2.30

    E-Print Network [OSTI]

    Low, Steven H.

    key characteristics similar to the market economy in pre- Industrial Revolution Western Europe. Why observing parallels between pre-Industrial Revolution Western Europe and late imperial China, we will also, then, didn't an industrial breakthrough occur in late imperial China? This course focuses

  4. A non-monotone conservation law for dune morphodynamics

    E-Print Network [OSTI]

    Alibaud, Nathaël; Isèbe, Damien

    2007-01-01

    We investigate a non-local non linear conservation law, first introduced by A.C. Fowler to describe morphodynamics of dunes, see \\cite{Fow01, Fow02}. A remarkable feature is the violation of the maximum principle, which allows for erosion phenomenon. We prove well-posedness for initial data in $L^2$ and give explicit counterexample for the maximum principle. We also provide numerical simulations corroborating our theoretical results.

  5. The focal plane instrumentation for the DUNE mission

    E-Print Network [OSTI]

    Jeff Booth; Mark Cropper; Frank Eisenhauer; Alexandre Refregier; the DUNE collaboration

    2008-07-25

    DUNE (Dark Universe Explorer) is a proposed mission to measure parameters of dark energy using weak gravitational lensing The particular challenges of both optical and infrared focal planes and the DUNE baseline solution is discussed. The DUNE visible Focal Plane Array (VFP) consists of 36 large format red-sensitive CCDs, arranged in a 9x4 array together with the associated mechanical support structure and electronics processing chains. Four additional CCDs dedicated to attitude control measurements are located at the edge of the array. All CCDs are 4096 pixel red-enhanced e2v CCD203-82 devices with square 12 $\\mu$m pixels, operating from 550-920nm. Combining four rows of CCDs provides a total exposure time of 1500s. The VFP will be used in a closed-loop system by the spacecraft, which operates in a drift scan mode, in order to synchronize the scan and readout rates. The Near Infrared (NIR) FPA consists of a 5 x 12 mosaic of 60 Hawaii 2RG detector arrays from Teledyne, NIR bandpass filters for the wavelength bands Y, J, and H, the mechanical support structure, and the detector readout and signal processing electronics. The FPA is operated at a maximum temperature of 140 K for low dark current of 0.02e$-$/s. Each sensor chip assembly has 2048 x 2048 square pixels of 18 $\\mu$m size (0.15 arcsec), sensitive in the 0.8 to 1.7 $\\mu$m wavelength range. As the spacecraft is scanning the sky, the image motion on the NIR FPA is stabilized by a de-scanning mirror during the integration time of 300 s per detector. The total integration time of 1500 seconds is split among the three NIR wavelengths bands. DUNE has been proposed to ESA's Cosmic Vision program and has been jointly selected with SPACE for an ESA Assessment Phase which has led to the joint Euclid mission concept.

  6. Groundwater recharge from Long Lake, Indiana Dunes National Lakeshore

    SciTech Connect (OSTI)

    Isiorho, S.A.; Beeching, F.M. (Indiana Univ., Fort Wayne, IN (United States). Geosciences Dept.); Whitman, R.L.; Stewart, P.M. (National Park Services, Porter, IN (United States). Indiana Dunes National Lakeshore); Gentleman, M.A.

    1992-01-01

    Long Lake, located between Lake Michigan and the Dune-complexes of Indiana Dunes, was formed during Pleistocene and Holocene epochs. The lake is currently being studied to understand the detailed hydrology. One of the objective of the study is to understand the hydrologic relationship between the lake and a water treatment holding pond to the northeast. Understanding the water movement between the two bodies of water, if any, would be very important in the management and protection of nature preserves in the area. Seepage measurement and minipiezometric tests indicate groundwater recharge from Long Lake. The groundwater recharge rate is approximately 1.40 to 22.28 x 10[sup [minus]4] m/day. An estimate of the amount of recharge of 7.0 x 10[sup 6] m[sup 3]/y may be significant in terms of groundwater recharge of the upper aquifer system of the Dunes area. The water chemistry of the two bodies of water appears to be similar, however, the pH of the holding pond is slightly alkaline (8.5) while that of Long Lake is less alkaline (7.7). There appears to be no direct contact between the two bodies of water (separated by approximately six meters of clay rich sediment). The geology of the area indicates a surficial aquifer underlying Long Lake. The lake should be regarded as a recharge area and should be protected from pollutants as the degradation of the lake would contaminate the underlying aquifer.

  7. The focal plane instrumentation for the DUNE mission

    E-Print Network [OSTI]

    Booth, Jeff; Eisenhauer, Frank; Refregier, Alexandre

    2008-01-01

    DUNE (Dark Universe Explorer) is a proposed mission to measure parameters of dark energy using weak gravitational lensing The particular challenges of both optical and infrared focal planes and the DUNE baseline solution is discussed. The DUNE visible Focal Plane Array (VFP) consists of 36 large format red-sensitive CCDs, arranged in a 9x4 array together with the associated mechanical support structure and electronics processing chains. Four additional CCDs dedicated to attitude control measurements are located at the edge of the array. All CCDs are 4096 pixel red-enhanced e2v CCD203-82 devices with square 12 $\\mu$m pixels, operating from 550-920nm. Combining four rows of CCDs provides a total exposure time of 1500s. The VFP will be used in a closed-loop system by the spacecraft, which operates in a drift scan mode, in order to synchronize the scan and readout rates. The Near Infrared (NIR) FPA consists of a 5 x 12 mosaic of 60 Hawaii 2RG detector arrays from Teledyne, NIR bandpass filters for the wavelength ...

  8. A finite element analysis of pneumatic-tire/sand interactions

    E-Print Network [OSTI]

    Grujicic, Mica

    A finite element analysis of pneumatic-tire/sand interactions during off-road vehicle travel M pneumatic tire and sand during off-road vehicle travel. Keywords Finite element analysis, Road vehicles and for other tire/sand combinations. Since the finite element analysis of the tire/sand interaction enables

  9. Generation of sand bars under surface waves

    E-Print Network [OSTI]

    Hancock, Matthew James, 1975-

    2005-01-01

    (cont.) Experiments were performed in a large wave flume to validate the theory and to study additional aspects of sand bar evolution. The wave envelope and bar profile were recorded for low and high beach reflection, ...

  10. Nigeria to step up tar sands activity

    SciTech Connect (OSTI)

    Not Available

    1987-03-01

    The Nigerian government has directed its Ministry of Mines, Power and Steel to assume responsibility for the exploration and exploitation of tar sands deposits in Bendel, Ondo and Oyo States. The directive resulted from a survey report by the University of Ife's geological consultancy unit on bituminous sand deposits in the area. The statement said the government was satisfied that there were large commercial quantities of the sands in the three states. The survey had reported that Nigeria could recover between 31 and 40 billion barrels of heavy crude from the tar sand deposits. Exploration for hydrocarbons is currently going on in Anambra and Lake Chad basins as well as the Benue Trough. Apart from the Nigerian National Petroleum Corporation, Shell Petroleum and Gulf Oil have begun exploration activities in the Ondo area. Meanwhile, Nigeria has had to import heavy crude from Venezuela, for processing at the Kaduna refinery.

  11. New method for sand control and well stimulation in unconsolidated dirty sands

    SciTech Connect (OSTI)

    Aslesen, K.S.; Short, C.J.; Terwilliger, P.L.

    1981-01-01

    A new technique, the Solder Glass sand consolidation well completion method, has been developed which allows unlimited drawdown and improves productivity in wells completed in unconsolidated formations containing shales and clays. This technique eliminates the problems of sand production and fines migration by artificially consolidating a volume of reservoir sand near the wellbore. The consolidation is resistant to high temperature, chemical attack, and degradation resulting from high velocity fluid flow. Additionally, porosity and permeability in the consolidated volume of reservoir sand are improved as a result of irreversible dehydration of clays. 12 refs.

  12. Treating tar sands formations with dolomite

    DOE Patents [OSTI]

    Vinegar, Harold J.; Karanikas, John Michael

    2010-06-08

    Methods for treating a tar sands formation are described herein. The tar sands formation may include dolomite and hydrocarbons. Methods may include providing heat at less than the decomposition temperature of dolomite from one or more heaters to at least a portion of the formation. At least some of the hydrocarbon fluids are mobilized in the formation. At least some of the hydrocarbon fluids may be produced from the formation.

  13. SANDIA REPORT SAND2014-19432

    E-Print Network [OSTI]

    capacity. Due to the existing landscape of how and where PV is installed, including distributed generationSANDIA REPORT SAND2014-19432 Unlimited Release Printed November 2014 Solar PV O&M Standards://www.ntis.gov/help/ordermethods.asp?loc=7-4-0#online #12;3 SAND2014-19432 Unlimited Release Printed November 2014 Solar PV O&M Standards

  14. History of Education Society Education and Society in Late Imperial China, 1600-1900 by Benjamin A. Elman; Alexander

    E-Print Network [OSTI]

    Elman, Benjamin

    History of Education Society Education and Society in Late Imperial China, 1600-1900 by Benjamin A. Elman; Alexander Woodside Review by: Joanna F. Handlin Smith History of Education Quarterly, Vol. 36, No. 1 (Spring, 1996), pp. 95-98 Published by: History of Education Society Stable URL: http

  15. Closed-form solutions to surface Green's functions Department of Mathematics, Imperial College, London SW7 2BZ, United Kingdom

    E-Print Network [OSTI]

    Umerski, Andrey

    for surface Green's functions within arbitrary multiorbital models. The formulation is completely generalClosed-form solutions to surface Green's functions A. Umerski Department of Mathematics, Imperial-Kohn-Rostoker and other Green's-function equivalent formalisms, where the Hamiltonian can be put into a localized i

  16. Earthquake Damage Detection in the Imperial County Services Building III: Analysis of Wave Travel Times via Impulse Response Functions

    E-Print Network [OSTI]

    Southern California, University of

    1 Earthquake Damage Detection in the Imperial County Services Building III: Analysis of Wave Travel characteristics of the structure, and are not sensitive to local damage. Wave travel times between selected changes in such characteristics of response are potentially more sensitive to local damage. In this paper

  17. Handbook of texture analysis Mirmehdi M., Xie X., Suri J., IMPERIAL COLLEGE PRESS, London, UK, 2009. 413 pp.

    E-Print Network [OSTI]

    Theune, Mariët

    Handbook of texture analysis Mirmehdi M., Xie X., Suri J., IMPERIAL COLLEGE PRESS, London, UK, 2009. 413 pp. Type: Book Date Reviewed: 06/01/10 Texture is still not fully understood. Handbooks on both in the world of science? What is the value of this handbook? The abstract of the first chapter, "Introduction

  18. A Typology of Foredune Textures: Sand Patches and Climate Controls 

    E-Print Network [OSTI]

    Ryu, Wansang

    2012-12-10

    much (R^2 is 0.04 at maximum). This suggests that dune activity or stabilization in coastal dune systems is mainly controlled by vegetation cover, which is in turn affected by precipitation. Foredune textures can be a useful tool to predict foredune...

  19. West Hampton Dunes, New York: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page| Open Energy Information Serbia-EnhancingEtGeorgia: Energy Resources JumpChicago, Illinois:Jump to:Hampton Dunes, New

  20. LPO5-002-Proj-Poster-CSP-CrescentDunes

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankADVANCED MANUFACTURING OFFICE INDUSTRIALU.S. DepartmentJeanKeyLANLLG: Order4Tesla MotorsCRESCENT DUNES

  1. Study of pore pressure variation during liquefaction using two constitutive models for sand

    E-Print Network [OSTI]

    Taiebat, Mahdi; Shahir, Hadi; Pak, Ali

    2007-01-01

    of the behavior of liquefiable sand in the centrifuge test.surface plasticity model for sands. Geotechnique 1997; 47(Yanagisawa E. Settlement of sand models under unidirectional

  2. The Effect of Vegetation Density on the Resilience of Coastal Dune Systems Against Wave-Induced Erosion 

    E-Print Network [OSTI]

    Tyler, Robert Cory

    2013-09-28

    by coastal managers and stakeholders. Dunes with healthy vegetation growth are believed to provide an even higher resilience against wave-induced erosion. However, very little research currently exists on quantifying the effect that plants have on dune...

  3. Evolution of Arability and Land Use, Sacramento–San Joaquin Delta, California

    E-Print Network [OSTI]

    Deverel, Steven J.; Lucero, Christina E.; Bachand, Sandra

    2015-01-01

    soils oxidized, the eolian dunes became visible on thesehave disappeared, these sand dunes have been exposed. In thePalm, Orwood and Hotchkiss. Dune sands trend southeastward,

  4. Thursday, March 26, 2009 POSTER SESSION II: MARS: DUNES, DUST, AND WIND

    E-Print Network [OSTI]

    Rathbun, Julie A.

    mainly from the experimental work are presented. Segura T. L. Colaprete A. Global Modeling of Impact-induced Greenhouse Warming on Early Mars [#1056] We have modeled the climate effects of impacts on early Mars. Aeolian Dunes as Ground Truth for GCM and Mesoscale Modeling on Mars [#1212] Aeolian dunes preserve

  5. ~WOVEGROUND BIOMASS AND NET PRIMARY PRODUCTION ALONG .A VIRGINIA BARRIER ISLAND DUNE CHRONOSEQUENCE

    E-Print Network [OSTI]

    Lawrence, Deborah

    ~WOVEGROUND BIOMASS AND NET PRIMARY PRODUCTION ALONG .A VIRGINIA BARRIER ISLAND DUNE CHRONOSEQUENCE BIOMASS AND NET PRIMARY PRODUCTION ALONG A VIRGINIA BARRIER ISLAND DUNE CHRONOSEQUENCE John Joseph DiLustro Old Dominion University, 1994 Director: Dr. Frank P. Day Jr. Aboveground biomass was examined along

  6. Creating fluid injectivity in tar sands formations

    DOE Patents [OSTI]

    Stegemeier, George Leo; Beer, Gary Lee; Zhang, Etuan

    2010-06-08

    Methods for treating a tar sands formation are described herein. Methods for treating a tar sands may include heating a portion of a hydrocarbon layer in the formation from one or more heaters located in the portion. The heat may be controlled to increase the permeability of at least part of the portion to create an injection zone in the portion with an average permeability sufficient to allow injection of a fluid through the injection zone. A drive fluid and/or an oxidizing fluid may be provided into the injection zone. At least some hydrocarbons are produced from the portion.

  7. Creating fluid injectivity in tar sands formations

    DOE Patents [OSTI]

    Stegemeier, George Leo; Beer, Gary Lee; Zhang, Etuan

    2012-06-05

    Methods for treating a tar sands formation are described herein. Methods for treating a tar sands may include heating a portion of a hydrocarbon layer in the formation from one or more heaters located in the portion. The heat may be controlled to increase the permeability of at least part of the portion to create an injection zone in the portion with an average permeability sufficient to allow injection of a fluid through the injection zone. A drive fluid and/or an oxidizing fluid may be provided into the injection zone. At least some hydrocarbons including mobilized hydrocarbons are produced from the portion.

  8. Analytical mesoscale modeling of aeolian sand transport

    E-Print Network [OSTI]

    Marc Lämmel; Anne Meiwald; Klaus Kroy

    2014-05-03

    We analyze the mesoscale structure of aeolian sand transport, based on a recently developed two-species continuum model. The calculated sand flux and important average characteristics of the grain trajectories are found to be in remarkable agreement with field and wind-tunnel data. We conclude that the essential mesoscale physics is insensitive to unresolved details on smaller scales and well captured by the coarse-grained analytical model, thus providing a sound basis for precise and numerically efficient mesoscale modeling of aeolian structure formation.

  9. PUBLISHED ONLINE: 12 JANUARY 2014 | DOI: 10.1038/NGEO2047 Emergence of oblique dunes in a landscape-scale

    E-Print Network [OSTI]

    Narteau, Clément

    LETTERS PUBLISHED ONLINE: 12 JANUARY 2014 | DOI: 10.1038/NGEO2047 Emergence of oblique dunes Courrech du Pont3 Aeolian dunes in many arid environments on Earth are shaped by seasonally varying bimodal wind regimes. However, the dynamics of dune evolution under such wind regimes are difficult

  10. The Kelso dune field is located in the eastern Mojave Desert, California, at the terminus of a

    E-Print Network [OSTI]

    Ramsey, Michael

    ABSTRACT The Kelso dune field is located in the eastern Mojave Desert, California, at the terminus significant spectral variations that indicate potential mineralogic heterogeneities within the active dunes-member minerals that showed marked variations within the dunes. In addition, standard petrographic techniques re

  11. Turbulent flow and drag over fixed two-and three-dimensional dunes Jeremy G. Venditti1,2

    E-Print Network [OSTI]

    Venditti, Jeremy G.

    Turbulent flow and drag over fixed two- and three-dimensional dunes Jeremy G. Venditti1,2 Received measurements of turbulent flow were obtained over a fixed flat bed, two- dimensional (2-D) dunes and four types of three-dimensional (3-D) dune morphologies including (1) full width saddles, (2) full width lobes, (3

  12. SANDIA REPORT SAND96I 992 q UC1211

    E-Print Network [OSTI]

    C.3 SANDIA REPORT SAND96­I 992 q UC­1211 Unlimited Release Printed August 1996 A Generalized codes Printed copy: A03 Microfiche copy: AOI #12;Category Distribution UC-1211 SAND96-1992 Unlimited

  13. SAND87-2039 UC-60 Unlimited Release

    E-Print Network [OSTI]

    SAND87-2039 UC-60 Unlimited Release Printed November 1987 Fatigue Crack Growth Due to Random Road Springfield, VA 22161 NTIS price codes Printed copy: A08 Microfiche copy: A01 . #12;SAND87

  14. Preliminary relative permeability estimates of methane hydrate-bearing sand

    E-Print Network [OSTI]

    Seol, Yongkoo; Kneafsey, Timothy J.; Tomutsa, Liviu; Moridis, George J.

    2006-01-01

    sand by means of inverse modeling, which involved matching water saturation predictions with observations from a controlled waterflood

  15. SANDIA REPORT SAND2003-0723

    E-Print Network [OSTI]

    Release Printed March 2003 INNOVATIVE DESIGN APPROACHES FOR LARGE WIND TURBINE BLADES WindPACT Blade of the WindPACT Blade System Design Study (BSDS) was investigation and evaluation of design and manufacturingSANDIA REPORT SAND2003-0723 Unlimited Release Printed March 2003 Innovative Design Approaches

  16. SANDIA REPORT SAND2007-0201

    E-Print Network [OSTI]

    ://www.ntis.gov/help/ordermethods.asp?loc=7-4-0#online 2 #12;Design of 9-Meter Carbon-Fiberglass Prototype Blades: CX-100 and TX-100 Final to facilitate the blade design and analyses performed. At GEC, Dayton Griffin was the technical leaSANDIA REPORT SAND2007-0201 Unlimited Release Printed September 2007 Design of 9-Meter Carbon

  17. SANDIA REPORT SAND2001-1441

    E-Print Network [OSTI]

    SANDIA REPORT SAND2001-1441 Unlimited Release Printed May 2001 Analysis of a Composite Blade Design-1441 Unlimited Release Printed May 2001 Analysis of a Composite Blade Design for the AOC lY50 Wind Turbine Using Abstract A fiberglass blade was designed for the Atlantic Orient Corporation (AOC) H/50 wind turbine

  18. SANDIA REPORT SAND99-2706

    E-Print Network [OSTI]

    Department of Energy under Contract DE-AC04-94AL85000. Approved for public release; further disseminationSANDIA REPORT SAND99-2706 Unlimited Release Printed October 1999 Space-Variant Post for the United States Department of Energy by Sandia Corporation. NOTICE: This report was prepared as an account

  19. CONTRACTOR REPORT SAND97-3002

    E-Print Network [OSTI]

    CONTRACTOR REPORT SAND97-3002 Unlimited Release UC-121O DOE/MSU Composite Material Fatigue Database commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does directly from the best available copy. Available to DOE and DOE contractors from Office of Scientific

  20. SAND 2004-0074 Unlimited Release

    E-Print Network [OSTI]

    TURBINE BLADES FINAL REPORT WindPACT Blade System Design Studies TPI Composites, Inc. 373 Market StreetSAND 2004-0074 Unlimited Release Printed May 2004 INNOVATIVE DESIGN APPROACHES FOR LARGE WIND Warren, RI 02885 ABSTRACT The goal of the Blade System Design Study (BSDS) was investigation

  1. 16th President Timothy D. Sands

    E-Print Network [OSTI]

    and its economy." Said Sands: "I am delighted and honored to serve this great university. There is so much earned a bachelor's degree with highest honors in engineering physics and a master's degree and doctorate as the Basil S. Turner Professor of Engineering in the School of Materials Engineering and the School

  2. SANDIA REPORT SAND2009-1100

    E-Print Network [OSTI]

    SANDIA REPORT SAND2009-1100 Unlimited Release Printed March 2009 Assessment of Wind Turbine Seismic for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does

  3. SANDIA REPORT SAND931380 q UC261

    E-Print Network [OSTI]

    THE APPLICATION OF NON-DESTRUCTIVE TECHNIQUES TO THE TESTING OF A WIND TURBINE BLADE Herbert Sutherland, Alan (Pratt & Whitney); West Palm Beach, FL 33410 ABSTRACT NonDestructive Testing (NDT), also called NonDestructiveSANDIA REPORT SAND93­1380 q UC­261 Unlimited Release Printed June 1994 The Application of Non-Destructive

  4. SAND91-2228 Unlimited Release

    E-Print Network [OSTI]

    Release Printed July 1992 MEASURED DATA FOR THE SANDIA 34-METER VERTICAL AXIS WIND TURBINE by Thomas D The 34-meter Test Bed is a research-oriented, variable-speed vertical-axis wind turbine locatedSAND91-2228 Unlimited Release Printed July 1992 Measured Data for the Sandia 34-Meter Vertical Axis

  5. SAND80-2669 Unlimited Release

    E-Print Network [OSTI]

    SAND80-2669 Unlimited Release UC-60 ; Guy Cable Design and Damping for Vertical Axis Wind Turbines ABSTRACT Guy cables are frequently used to support vertical axis wind turbines since guying the turbine;Introduction Most vertical axis wind turbines use guy cables to support the top of a single, fully rotating

  6. The Time of Sands: Quartz-rich Sand Deposits as a Renewable Resource

    E-Print Network [OSTI]

    Shaffer, Nelson R.

    2006-01-01

    rich Sand Deposits as a Renewable Resource Nelson R. Shaffercan even be considered a renewable resource. The reader willbuild our society, and its renewable nature. We are not the

  7. Well completion process for formations with unconsolidated sands

    DOE Patents [OSTI]

    Davies, David K. (Kingwood, TX); Mondragon, III, Julius J. (Redondo Beach, CA); Hara, Philip Scott (Monterey Park, CA)

    2003-04-29

    A method for consolidating sand around a well, involving injecting hot water or steam through well casing perforations in to create a cement-like area around the perforation of sufficient rigidity to prevent sand from flowing into and obstructing the well. The cement area has several wormholes that provide fluid passageways between the well and the formation, while still inhibiting sand inflow.

  8. DRIVEN PIPE PILES IN DENSE SAND BYRON BYRNE

    E-Print Network [OSTI]

    Byrne, Byron

    DRIVEN PIPE PILES IN DENSE SAND BYRON BYRNE GEOMECHANICS GROUP THE UNIVERSITY OF WESTERN AUSTRALIA #12;Driven Pipe Piles in Dense Sand Byron Byrne Geomechanics Group The University of Western Australia #12;Driven Pipe Piles in Dense Sand Byron Byrne Geomechanics Group The University of Western Australia

  9. Channel bed evolution and sediment transport under declining sand inputs

    E-Print Network [OSTI]

    Montgomery, David R.

    Channel bed evolution and sediment transport under declining sand inputs Karen B. Gran,1,2 David R structure development and sediment transport as sand inputs decline. On the Pasig-Potrero River, we investigated channel recovery following emplacement of sand-rich pyroclastic deposits in the 1991 eruption

  10. Pseudomonas sabulinigri sp. nov., isolated from black beach sand

    E-Print Network [OSTI]

    Bae, Jin-Woo

    Pseudomonas sabulinigri sp. nov., isolated from black beach sand Kyoung-Ho Kim,1 Seong Woon Roh,1 , was isolated from black sand collected from Soesoggak, Jeju Island, Korea. Cells grew at 4­37 6C, at pH 5 beach sand, a bacterium was isolated and subjected to taxonomic characterization. On the basis

  11. Bravo Araby Navy Base Holtville

    E-Print Network [OSTI]

    Mesquite Loveland Imperial Highline Descanso Calexico Sand Hill Navy Base Holtville Glencliff Foothills

  12. HOW HIGH IS THAT DUNE? A COMPARISON OF METHODS USED TO CONSTRAIN THE MORPHOMETRY OF AEOLIAN BEDFORMS ON MARS. M. Bourke1

    E-Print Network [OSTI]

    Bourke, Mary C.

    HOW HIGH IS THAT DUNE? A COMPARISON OF METHODS USED TO CONSTRAIN THE MORPHOMETRY OF AEOLIAN available for dunes on Mars). These include dune height, width, length, surface area, volume, lon- gitudinal. In this paper we undertake a comparative analysis of methods used to determine the height of aeolian dunes

  13. Guide to preparing SAND reports. Revised

    SciTech Connect (OSTI)

    Locke, T.K. [ed.

    1996-04-01

    This guide contains basic information needed to produce a SAND report. Its guidelines reflect DOE regulation and Sandia policy. The guide includes basic writing instructions in an annotated sample report; guidance for organization, format, and layout of reports produced by line organizations; and information about conference papers, journal articles, and brochures. The appendixes contain sections on Sandia`s preferred usage, equations, references, copyrights and permissions, and publishing terms.

  14. Solvent extraction of Southern US tar sands

    SciTech Connect (OSTI)

    Penney, W.R.

    1990-01-01

    The Department of Chemical Engineering at the University of Arkansas, in association with Diversified Petroleum Recovery, Inc. (DPR) of Little Rock, Arkansas, has been developing a solvent extraction process for the recovery of bitumen from tar sands for the past five years. The unique feature of the process is that the bitumen is recovered from the solvent by contacting with a co-solvent, which causes the bitumen to precipitate. The overall purpose of this project is to study both the technical and economic feasibility of applying this technology for recovery of bitumen from tar sands by (1) investigating the socioeconmic factors which affect (a) plant siting and (b) the market value of recovered bitumen; (2) operating a process demonstration unit at the rate of 1 lb/hr recovered bitumen while producing clean sand and recyclable solvents; and (3) determine the economic conditions which will make a bitumen recovery project economical. DPR has analyzed the historical trends of domestic production, consumption, discoveries and reserves of crude oil. They have started an investigation of the volatility in the price of crude oil and of gasoline prices and of the differential between gasoline and crude oil. DPR continues to analyze the geographical movement and demand for asphalt products. Utah does not appear economically attractive as a site for a bitumen from tar sands asphalt plant. Oklahoma sites are now being studied. This report also contains the quarterly progress report from a University of Nevada study to determine bitumen composition, oxygen uptake rates, and viscosities of Alabama and Utah bitumens. Both reports have been indexed separately for inclusion on the data base.

  15. Aspects of tar sands development in Nigeria

    SciTech Connect (OSTI)

    Adewusi, V.A. (Dept. of Chemical Engineering, Obafemi Awolowo Univ., Ile-Ife (NG))

    1992-07-01

    Development of Nigerian massive reserves of crude bitumen and associated heavy oil is imminent in view of the impacts that the huge importation of these materials and their products have on the nation's economy, coupled with the depleting reserves of Nigeria and highlights the appropriate production technology options and their environmental implications. The utilization potentials of these resources are also enumerated, as well as the government's role in achieving accelerated, long-term tar sands development in the country.

  16. EA-1581: Sand Hills Wind Project, Wyoming

    Broader source: Energy.gov [DOE]

    The Bureau of Land Management, with DOE’s Western Area Power Administration as a cooperating agency, was preparing this EA to evaluate the environmental impacts of a proposal to construct, operate, and maintain the Sand Hills Wind Energy Facility on private and federal lands in Albany County, Wyoming. If the proposed action had been implemented, Western would have interconnected the proposed facility to an existing transmission line. This project has been canceled.

  17. SiPMs characterization and selection for the DUNE far detector photon detection system

    E-Print Network [OSTI]

    Sun, Yujing

    2015-01-01

    The Deep Underground Neutrino Experiment (DUNE) together with the Long Baseline Neutrino Facility (LBNF) hosted at the Fermilab will provide a unique, world-leading program for the exploration of key questions at the forefront of neutrino physics and astrophysics. CP violation in neutrino flavor mixing is one of its most important potential discoveries. Additionally, the experiment will determine the neutrino mass hierarchy and precisely measure the neutrino mixing parameters which may potentially reveal new fundamental symmetries of nature. Moreover, the DUNE is also designed for the observation of nucleon decay and supernova burst neutrinos. The photon detection (PD) system in the DUNE far detector provides trigger for cosmic backgrounds, enhances supernova burst trigger efficiency and improves the energy resolution of the detector. The DUNE adopts the technology of liquid argon time projection chamber (LArTPC) that requires the PD sensors, silicon photomultipliers (SiPM), to be carefully chosen to not only...

  18. AEOLIAN DUNE FIELDS OF KANSAS AND THEIR RESPONSE TO LATE-QUATERNARY DROUGHT

    E-Print Network [OSTI]

    Halfen, Alan Frederick

    2012-12-31

    Aeolian dune fields are ubiquitous features of the North American Great Plains, and contained within their stratigraphy are important records of changes in prehistoric climate. Using absolute dating techniques, researchers can determine the timing...

  19. Conceptual Design and Physical Model Tests of a Levee-in-Dune Hurricane Barrier 

    E-Print Network [OSTI]

    West, Nicholas Allan

    2014-12-04

    that simulate 100-year storm damage caused by both surge and waves. Dune and beach morphology for each concept is measured through laser profiling techniques, and each concept is evaluated based on calculated erosion and accretion, as well as design...

  20. Probing CP violation signal at DUNE in presence of non-standard neutrino interactions

    E-Print Network [OSTI]

    Masud, Mehedi; Mehta, Poonam

    2015-01-01

    We discuss the impact of non-standard neutrino matter interactions (NSI) in propagation on the determination of CP phase in the context of the long baseline accelerator experiments such as Deep Underground Neutrino Experiment (DUNE). DUNE will mainly address the issue of CP violation in the leptonic sector. Here we study the role of NSI and its impact on the question of observing the CP violation signal at DUNE. We consider two scenarios of oscillation with three active neutrinos in absence and presence of NSI. We elucidate the importance of ruling out subdominant new physics effects introduced by NSI in inferring CP violation signal at DUNE by considering NSI terms collectively as well as by exploiting the non-trivial interplay of moduli and phases of the NSI terms. We demonstrate the existence of NSI-SI degeneracies which need to be eliminated in reliable manner in order to make conclusive statements about the CP phase.

  1. Collision dynamics of two barchan dunes simulated by a simple model

    E-Print Network [OSTI]

    Atsunari Katsuki; Hiraku Nishimori; Noritaka Endo; Keisuke Taniguchi

    2004-12-24

    The collision processes of two crescentic dunes called barchans are systematically studied using a simple computer simulation model. The simulated processes, coalescence, ejection and reorganization, qualitatively correspond to those observed in a water tank experiment. Moreover we found the realized types of collision depend both on the mass ratio and on the lateral distance between barchans under initial conditions. A simple set of differential equations to describe the collision of one-dimensional (1D) dunes is introduced.

  2. Policy Analysis of the Canadian Oil Sands Experience

    SciTech Connect (OSTI)

    None, None

    2013-09-01

    For those who support U.S. oil sands development, the Canadian oil sands industry is often identified as a model the U.S. might emulate, yielding financial and energy security benefits. For opponents of domestic oil sands development, the Canadian oil sands experience illustrates the risks that opponents of development believe should deter domestic policymakers from incenting U.S. oil sands development. This report does not seek to evaluate the particular underpinnings of either side of this policy argument, but rather attempts to delve into the question of whether the Canadian experience has relevance as a foundational model for U.S. oil sands development. More specifically, this report seeks to assess whether and how the Canadian oil sands experience might be predictive or instructive in the context of fashioning a framework for a U.S. oil sands industry. In evaluating the implications of these underpinnings for a prospective U.S. oil sands industry, this report concentrates on prospective development of the oil sands deposits found in Utah.

  3. Oil shale, tar sands, and related materials

    SciTech Connect (OSTI)

    Stauffer, H.C.

    1981-01-01

    This sixteen-chapter book focuses on the many problems and the new methodology associated with the commercialization of the oil shale and tar sand industry. Topics discussed include: an overview of the Department of Energy's oil shale R, D, and D program; computer simulation of explosive fracture of oil shale; fracturing of oil shale by treatment with liquid sulfur dioxide; chemistry of shale oil cracking; hydrogen sulfide evolution from Colorado oil shale; a possible mechanism of alkene/alkane production in oil shale retorting; oil shale retorting kinetics; kinetics of oil shale char gasification; a comparison of asphaltenes from naturally occurring shale bitumen and retorted shale oils: the influence of temperature on asphaltene structure; beneficiation of Green River oil shale by density methods; beneficiation of Green River oil shale pelletization; shell pellet heat exchange retorting: the SPHER energy-efficient process for retorting oil shale; retorted oil shale disposal research; an investigation into the potential economics of large-scale shale oil production; commercial scale refining of Paraho crude shale oil into military specification fuels; relation between fuel properties and chemical composition; chemical characterization/physical properties of US Navy shale-II fuels; relation between fuel properties and chemical composition: stability of oil shale-derived jet fuel; pyrolysis of shale oil residual fractions; synfuel stability: degradation mechanisms and actual findings; the chemistry of shale oil and its refined products; the reactivity of Cold Lake asphaltenes; influence of thermal processing on the properties of Cold Lake asphaltenes: the effect of distillation; thermal recovery of oil from tar sands by an energy-efficient process; and hydropyrolysis: the potential for primary upgrading of tar sand bitumen.

  4. SANDIA REPORT SAND2014-3416 Unlimited Release

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    SAND2014-3416 Unlimited Release Printed April 2014 Safety, Codes and Standards for Hydrogen Installations: Hydrogen Fueling System Footprint Metric Development A.P. Harris,...

  5. Oil Shale and Oil Sands Development Robert Keiter; John Ruple...

    Office of Scientific and Technical Information (OSTI)

    Conjunctive Surface and Groundwater Management in Utah: Implications for Oil Shale and Oil Sands Development Robert Keiter; John Ruple; Heather Tanana; Rebecca Holt 29 ENERGY...

  6. SAND97-8490 UC-404 Unlimited Release

    Office of Scientific and Technical Information (OSTI)

    SAND 97-8490 Unlimited Release Printed March 1997 UC-404 MECHANICAL PROPERTIES AND ENERGY ABSORPTION CHARACTERISTICS OF A POLYURETHANE FOAM S. H. Goods Materials Reliability...

  7. Investigation of sands subjected to dynamic loading 

    E-Print Network [OSTI]

    Reeves, Gary Neil

    1967-01-01

    Subject: Civil EnEineering LABORATORY INVESTIGATION OF SANDS SUBJECTED TO DYNAMIC LOADING A Thesis by Gary N. Reeves Approved as to style and content by: Chairman of Committee Head of Department Membe Me er August 1967 ACIINOWLEDGR&J. 'NTS I... am indebted to Dz. II. M. Coylc ior his advice and guidan& e while serving as chairman of my Graduate Advisory Cormaii tcc. Grati- tude is also expressed to Dr. T. J. I:irsch for his suggestions and assistance, and to Dr. J. R. Runkles, both...

  8. Heating tar sands formations while controlling pressure

    DOE Patents [OSTI]

    Stegemeier, George Leo (Houston, TX) [Houston, TX; Beer, Gary Lee (Houston, TX) [Houston, TX; Zhang, Etuan (Houston, TX) [Houston, TX

    2010-01-12

    Methods for treating a tar sands formation are described herein. Methods may include heating at least a section of a hydrocarbon layer in the formation from a plurality of heaters located in the formation. A pressure in the majority of the section may be maintained below a fracture pressure of the formation. The pressure in the majority of the section may be reduced to a selected pressure after the average temperature reaches a temperature that is above 240.degree. C. and is at or below pyrolysis temperatures of hydrocarbons in the section. At least some hydrocarbon fluids may be produced from the formation.

  9. Heating tar sands formations to visbreaking temperatures

    DOE Patents [OSTI]

    Karanikas, John Michael (Houston, TX); Colmenares, Tulio Rafael (Houston, TX); Zhang, Etuan (Houston, TX); Marino, Marian (Houston, TX); Roes, Augustinus Wilhelmus Maria (Houston, TX); Ryan, Robert Charles (Houston, TX); Beer, Gary Lee (Houston, TX); Dombrowski, Robert James (Houston, TX); Jaiswal, Namit (Houston, TX)

    2009-12-22

    Methods for treating a tar sands formation are described herein. Methods may include heating at least a section of a hydrocarbon layer in the formation from a plurality of heaters located in the formation. The heat may be controlled so that at least a majority of the section reaches an average temperature of between 200.degree. C. and 240.degree. C., which results in visbreaking of at least some hydrocarbons in the section. At least some visbroken hydrocarbon fluids may be produced from the formation.

  10. November 2015 | SAND2015-XXXX M

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass map shinesSolarNewsusceptometer under pressure |Cafés November 12,| SAND2015-XXXX M

  11. Sand Bluff Wind Farm | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION JEnvironmental Jump to:EA EIS Report UrlNM-bRenewableSMUD WindI Jump to:Miguel, California:Sand

  12. SAND_ModelFormUQ.dvi

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II) byMultidayAlumni > The EnergyRyan REPORT SAND352PP5.02 Jim Stewart SNL

  13. CONE PENETRATION TESTING AND SITE EXPLORATION IN EVALUATING THE LIQUEFACTION RESISTANCE OF SANDS AND SILTY SANDS

    E-Print Network [OSTI]

    CONE PENETRATION TESTING AND SITE EXPLORATION IN EVALUATING THE LIQUEFACTION RESISTANCE OF SANDS the magnitude of earthquake- induced shear stresses in a natural soil deposit. These seismically-induced shear resistance for this purpose. The seismic shear stress ratio (SSR) is calculated as described by

  14. Composition of modern sand from the Sierra Nevada, California, USA: Implications for actualistic petrofacies of continental-margin magmatic arcs

    E-Print Network [OSTI]

    Ingersoll, Raymond V.; Eastmond, Daniel J.

    2007-01-01

    variability of modern sands: Sedimentary Geology, v. 171, p.nonquartzose) lithic (L) sand(stone) composition. Designatedpredicted trend for sand(stone) composition during arc

  15. Zebra processes of oil recovery using fireflood and waterflood in alternate sands in a multi-sand environment

    SciTech Connect (OSTI)

    Chu, C.

    1995-12-31

    This paper presents a new process of oil recovery, namely, the zebra process, which is specifically advantageous to use in heavy oil reservoirs that exist in multiple sands. This process uses firefloods and waterfloods in alternate sands. The firefloods serve as formation preheaters which reduce the oil viscosities in the neighboring sands so that these sands, normally not amenable to waterfloods because of high viscosity, can be waterflooded with ease. The exciting news is that the air compression cost in firefloods can be reduced by a factor of three with a proper application of the zebra process. This great savings in air compression cost is possible because the heat that is normally lost to the overburden and underburden in firefloods is now being put to good use, by preheating the neighboring sands. Examples are given on zebraing several idealized sand-shale sequences involving three-, five-, six-, and seven-sand reservoirs, and also zebraing two actual sand-shale sequences, both involving five-sand reservoirs.

  16. Microstructural characterization of a Canadian oil sand

    E-Print Network [OSTI]

    Dinh, Hong Doan; Nauroy, Jean-François; Tang, Anh-Minh; Souhail, Youssef; 10.1139/T2012-072

    2013-01-01

    The microstructure of oil sand samples extracted at a depth of 75 m from the estuarine Middle McMurray formation (Alberta, Canada) has been investigated by using high resolution 3D X-Ray microtomography ($\\mu$CT) and Cryo Scanning Electron Microscopy (CryoSEM). $\\mu$CT images evidenced some dense areas composed of highly angular grains surrounded by fluids that are separated by larger pores full of gas. 3D Image analysis provided in dense areas porosity values compatible with in-situ log data and macroscopic laboratory determinations, showing that they are representative of intact states. $\\mu$CT hence provided some information on the morphology of the cracks and disturbance created by gas expansion. The CryoSEM technique, in which the sample is freeze fractured within the SEM chamber prior to observation, provided pictures in which the (frozen) bitumen clearly appears between the sand grains. No evidence of the existence of a thin connate water layer between grains and the bitumen, frequently mentioned in th...

  17. Direct numerical simulations of aeolian sand ripples

    E-Print Network [OSTI]

    Orencio Duran; Philippe Claudin; Bruno Andreotti

    2014-11-07

    Aeolian sand beds exhibit regular patterns of ripples resulting from the interaction between topography and sediment transport. Their characteristics have been so far related to reptation transport caused by the impacts on the ground of grains entrained by the wind into saltation. By means of direct numerical simulations of grains interacting with a wind flow, we show that the instability turns out to be driven by resonant grain trajectories, whose length is close to a ripple wavelength and whose splash leads to a mass displacement towards the ripple crests. The pattern selection results from a compromise between this destabilizing mechanism and a diffusive downslope transport which stabilizes small wavelengths. The initial wavelength is set by the ratio of the sediment flux and the erosion/deposition rate, a ratio which increases linearly with the wind velocity. We show that this scaling law, in agreement with experiments, originates from an interfacial layer separating the saltation zone from the static sand bed, where momentum transfers are dominated by mid-air collisions. Finally, we provide quantitative support for the use the propagation of these ripples as a proxy for remote measurements of sediment transport.

  18. TESTING OF TMR SAND MANTIS FINAL REPORT

    SciTech Connect (OSTI)

    Krementz, D; William Daugherty, W

    2007-06-12

    Screening tests of Sand Mantis candidate materials selected for erosion resistance have been completed. The results of this testing identified that over a relatively short period of operation (<1 hour), measurable erosion will occur in each of the candidate zoom tube materials given equal operating exposure. Additionally, this testing has shown that erosion of the rubber discharge hose directly downstream of the vehicle could be expected to limit the service life of the discharge hose. On the basis of these test results, SRNL recommends the following; {lg_bullet} redesign of critical system components (e.g., zoom tube, discharge hose) should be conducted to improve system characteristics relative to erosion and capitalize on the results of this testing, {lg_bullet} continued efforts to deploy the Sand Mantis should include testing to better define and optimize operating parameters, and gain an understanding of system dynamics, {lg_bullet} discontinue wear testing with the selected materials pending redesign of critical system components (1st recommendation) and inclusion of other candidate materials. The final selection of additional candidate materials should be made following design changes, but might include a Stellite alloy or zirconia.

  19. Grandparents Oppose Tar Sands Alberta tar sands are estimated to be 240 GtC (gigatons of carbon); see Intergovernmental Panel

    E-Print Network [OSTI]

    Hansen, James E.

    was 28% of global oil use for the cumulative amounts over the past 200 years. So Alberta tar sands would lead eventually to ways of cooking the oil out of most of the tar sands. Moreover, these numbersGrandparents Oppose Tar Sands Alberta tar sands are estimated to be 240 GtC (gigatons of carbon

  20. Introduction Alberta, Canada is home to oil sands where new development is

    E-Print Network [OSTI]

    Brown, Sally

    Introduction Hypothesis Methods Discussion Results Alberta, Canada is home to oil sands where new. Stress Hormone Analysis of Deer (Odocoileus virginiana and O. hemionus) in the Alberta Oil Sands in the Alberta oil sands area. #12;

  1. Modelling of reoxidation inclusion formation in steel sand casting

    E-Print Network [OSTI]

    Beckermann, Christoph

    Modelling of reoxidation inclusion formation in steel sand casting A. J. Melendez, K. D. Carlson pouring, as well as their final locations on the surface of steel sand castings. Inclusions originate. The inclusion model is implemented in a general-purpose casting simulation code. The model is validated

  2. Completion methods in thick, multilayered tight gas sands 

    E-Print Network [OSTI]

    Ogueri, Obinna Stavely

    2009-05-15

    Tight gas sands, coal-bed methane, and gas shales are commonly called unconventional reservoirs. Tight gas sands (TGS) are often described as formations with an expected average permeability of 0.1mD or less. Gas production rates from TGS reservoirs...

  3. Household scale slow sand filtration in the Dominican Republic

    E-Print Network [OSTI]

    Donison, Kori S. (Kori Shay), 1981-

    2004-01-01

    Slow sand filtration is a method of water treatment that has been used for hundreds of years. In the past two decades, there has been resurgence in interest in slow sand filtration, particularly as a low-cost, household-scale ...

  4. TECHNICAL NOTE Centrifuge cone penetration tests in sand

    E-Print Network [OSTI]

    Bolton, Malcolm

    TECHNICAL NOTE Centrifuge cone penetration tests in sand M. D. BOLTON,Ã M. W. GUI,Ã J. GARNIER,{ J. F. CORTE,{ G. BAGGE,{ J. LAUE} and R. RENZIk KEYWORDS: centrifuge modelling; in-situ testing; laboratory tests; piles; sands. INTRODUCTION Centrifuges have been widely adopted in modelling geotechnical

  5. Method and apparatus for hydrocarbon recovery from tar sands

    DOE Patents [OSTI]

    Westhoff, James D. (Laramie, WY); Harak, Arnold E. (Laramie, WY)

    1989-01-01

    A method and apparatus for utilizing tar sands having a broad range of bitumen content is disclosed. More particularly, tar sands are pyrolyzed in a cyclone retort with high temperature gases recycled from the cyclone retort to produce oil and hydrocarbon products. The spent tar sands are then burned at 2000.degree. F. in a burner to remove residual char and produce a solid waste that is easily disposable. The process and apparatus have the advantages of being able to utilize tar sands having a broad range of bitumen content and the advantage of producing product gases that are free from combustion gases and thereby have a higher heating value. Another important advantage is rapid pyrolysis of the tar sands in the cyclone so as to effectively utilize smaller sized reactor vessels for reducing capitol and operating costs.

  6. Method and apparatus for hydrocarbon recovery from tar sands

    DOE Patents [OSTI]

    Westhoff, J.D.; Harak, A.E.

    1988-05-04

    A method and apparatus for utilizing tar sands having a broad range of bitumen content is disclosed. More particularly, tar sands are pyrolyzed in a cyclone retort with high temperature gases recycled from the cyclone retort to produce oil and hydrocarbon products. The spent tar sands are then burned at 2000/degree/F in a burner to remove residual char and produce a solid waste that is easily disposable. The process and apparatus have the advantages of being able to utilize tar sands having a broad range of bitumen content and the advantage of producing product gases that are free from combustion gases and thereby have a higher heating value. Another important advantage is rapid pyrolysis of the tar sands in the cyclone so as to effectively utilize smaller sized reactor vessels for reducing capitol and operating costs. 1 fig., 1 tab.

  7. Modeling the large-scale structure of a barchan dune field

    E-Print Network [OSTI]

    Worman, S; Littlewood, R; Andreotti, B; Claudin, P

    2013-01-01

    In nature, barchan dunes typically exist as members of larger fields that display enigmatic structures that cannot be readily explained by external forcing. To explore the possibility that observed patterns self-organize, we built a numerical model that treats barchans as discrete entities that obey known empirical relationships and interact with one another according to simplified rules derived from theoretical and numerical work, and from field observations. A rich array of patterns, similar to those observed in nature, emerge from these relatively simple behaviors and interactions, offering a cohesive depiction and a potential explanation of field-scale phenomena. This is the first model to integrate calving and results support the hypothesis that it exerts a first order control on the system; It is fundamental to the formation and stability of field patterns and when the process is disabled, all dunes in all runs grow without bound on short time-scales. Insights derived from this synthesis of dune-scale p...

  8. Influence of grain size, shape and compaction on georadar waves: example of an Aeolian dune

    E-Print Network [OSTI]

    Guillemoteau, Julien; Dujardin, Jean-Rémi; 10.1111/j.1365-246X.2012.05577.x

    2012-01-01

    Many Ground Penetrating Radar (GPR) profiles acquired in dry aeolian environment have shown good reflectivity inside present-day dunes. We show that the origin of this reflectivity is related to changes in grain size distribution, packing and/or grain shape in a sandy material. We integrate these three parameters into analytical models for bulk permittivity in order to predict the reflections and the velocity of GPR waves. We consider two GPR cross-sections acquired over Aeolian dunes in the Chadian desert. The 2D migration of GPR data suggests that dunes contain different kinds of bounding surfaces. We discuss and model three kinds of reflections using reasonable geological hypothesis about Aeolian sedimentation processes. The propagation and the reflection of radar waves are calculated using the 1D wavelet modelling method in spectral domain. The results of the forward modelling are in good accordance with real observed data.

  9. Arsenic Removal Using AgedArsenic Removal Using Aged Rapid Sand Filter MediaRapid Sand Filter Media

    E-Print Network [OSTI]

    Arsenic Removal Using AgedArsenic Removal Using Aged Rapid Sand Filter MediaRapid Sand Filter Media byby C. Menard, D. Burt, M.R. CollinsC. Menard, D. Burt, M.R. Collins Water Treatment Technology Assistance CenterWater Treatment Technology Assistance Center Department of Civil Engineering

  10. Acoustic sand detector for fluid flowstreams

    DOE Patents [OSTI]

    Beattie, Alan G. (Corrales, NM); Bohon, W. Mark (Frisco, TX)

    1993-01-01

    The particle volume and particle mass production rate of particulate solids entrained in fluid flowstreams such as formation sand or fracture proppant entrained in oil and gas production flowstreams is determined by a system having a metal probe interposed in a flow conduit for transmitting acoustic emissions created by particles impacting the probe to a sensor and signal processing circuit which produces discrete signals related to the impact of each of the particles striking the probe. The volume or mass flow rate of particulates is determined from making an initial particle size distribution and particle energy distribution and comparing the initial energy distribution and/or the initial size distribution with values related to the impact energies of a predetermined number of recorded impacts. The comparison is also used to recalibrate the system to compensate for changes in flow velocity.

  11. Direct Production of Silicones From Sand

    SciTech Connect (OSTI)

    Larry N. Lewis; F.J. Schattenmann: J.P. Lemmon

    2001-09-30

    Silicon, in the form of silica and silicates, is the second most abundant element in the earth's crust. However the synthesis of silicones (scheme 1) and almost all organosilicon chemistry is only accessible through elemental silicon. Silicon dioxide (sand or quartz) is converted to chemical-grade elemental silicon in an energy intensive reduction process, a result of the exceptional thermodynamic stability of silica. Then, the silicon is reacted with methyl chloride to give a mixture of methylchlorosilanes catalyzed by cooper containing a variety of tract metals such as tin, zinc etc. The so-called direct process was first discovered at GE in 1940. The methylchlorosilanes are distilled to purify and separate the major reaction components, the most important of which is dimethyldichlorosilane. Polymerization of dimethyldichlorosilane by controlled hydrolysis results in the formation of silicone polymers. Worldwide, the silicones industry produces about 1.3 billion pounds of the basic silicon polymer, polydimethylsiloxane.

  12. Specters in the Sand: The Urban Hauntings in Alicia Gaspar de Alba’s Desert Blood: The Juárez Murders

    E-Print Network [OSTI]

    Ocegueda, Isela

    2008-01-01

    Specters in the Sand: The Urban Hauntings in Alicia Gasparentitled “Specters in the Sand: The Urban Hauntings in

  13. Imperial College London EEE 1L1 Autumn 2009 E2.2 Analogue Electronics E2.2 Analogue Electronics

    E-Print Network [OSTI]

    Papavassiliou, Christos

    Imperial College London ­ EEE 1L1 Autumn 2009 E2.2 Analogue Electronics E2.2 Analogue Electronics Autumn 2009 E2.2 Analogue Electronics What analogue electronics is · Engineering, i.e. the analysis ­ EEE 3L1 Autumn 2009 E2.2 Analogue Electronics analogue electronics is not only · CMOS integrated

  14. Eng(3-year) and MEng(4-year) in BIOENGINEERING There are two undergraduate degrees in Bioengineering at Imperial College: a 3-

    E-Print Network [OSTI]

    the final year for every BEng and MEng student. · MEng students also have a third year group project focusedEng(3-year) and MEng(4-year) in BIOENGINEERING There are two undergraduate degrees in Bioengineering at Imperial College: a 3- year BEng and a 4-year MEng. Both courses provide a broad foundation

  15. USENIX Association 10th USENIX Symposium on Operating Systems Design and Implementation (OSDI '12) 335 Dune: Safe User-level Access to Privileged CPU Features

    E-Print Network [OSTI]

    Chase, Jeffrey S.

    ) 335 Dune: Safe User-level Access to Privileged CPU Features Adam Belay, Andrea Bittau, Ali Mashtizadeh, David Terei, David Mazi`eres, Christos Kozyrakis Stanford University Abstract Dune is a system, and tagged TLBs, while preserving the exist- ing OS interfaces for processes. Dune uses the virtualiza- tion

  16. Roberts, T. M., Wang, P., and Kraus, N. C. 2007. Limits of Beach and Dune Erosion in Response to Wave Runup Elucidated From SUPERTANK. Proceedings Coastal Sediments '07

    E-Print Network [OSTI]

    US Army Corps of Engineers

    Roberts, T. M., Wang, P., and Kraus, N. C. 2007. Limits of Beach and Dune Erosion in Response, VA, 1961-1974. LIMITS OF BEACH AND DUNE EROSION IN RESPONSE TO WAVE RUNUP ELUCIDATED FROM SUPERTANK of swash runup. Exceptions to this direct relationship are those with beach or dune scarps. The vertical

  17. Dune: Safe User-level Access to Privileged CPU Features Adam Belay, Andrea Bittau, Ali Mashtizadeh, David Terei, David Mazi`eres, Christos Kozyrakis

    E-Print Network [OSTI]

    Kozyrakis, Christos

    Dune: Safe User-level Access to Privileged CPU Features Adam Belay, Andrea Bittau, Ali Mashtizadeh, David Terei, David Mazi`eres, Christos Kozyrakis Stanford University Abstract Dune is a system, and tagged TLBs, while preserving the exist- ing OS interfaces for processes. Dune uses the virtualiza- tion

  18. Quantification of Dune Response during a 6-Day Nor'easter, Outer Banks, NC Kate L. Brodie1, Nick J. Spore1, Christy Swann2

    E-Print Network [OSTI]

    US Army Corps of Engineers

    using Coastal Lidar And Imaging System (CLARIS) during the first dune collision event following cross-shore erosion of recently pushed, un-vegetated dunes reached 2 m/day. Variations in foreduneQuantification of Dune Response during a 6-Day Nor'easter, Outer Banks, NC Kate L. Brodie1, Nick J

  19. Population enumeration and the effects of oil and gas development on dune-dwelling lizards 

    E-Print Network [OSTI]

    Smolensky, Nicole Limunga

    2009-05-15

    abundances of dune-dwelling lizards among sites that varied in oil and gas development. I conducted distance line transects and compared those density estimates to densities obtained from total removal plots. I quantified the amount of oil and gas development...

  20. Coherent Structures in Turbulent Flow over Two-Dimensional River Dunes

    E-Print Network [OSTI]

    Omidyeganeh, Mohammad

    2011-01-01

    We performed large-eddy simulations of the flow over a typical two-dimensional dune geometry at laboratory scale (the Reynolds number based on the average channel height and mean velocity is 18,900) using the Lagrangian dynamic eddy-viscosity subgrid-scale model. The flow separates at the dune crest and reattaches downstream on the bed (at x=5.7h). A favorable pressure gradient accelerates the flow over the stoss-side (the upward-sloping region for x > 8h) and an unfavorable gradient for x dune. Due to the separation of the flow, a shear layer is generated after the crest that expands in the wake region towards the next dune. The outer-layer turbulence structures are visualized through isosurfaces of pressure fluctuations colored by distance to the surface. Spanwise vortices are generated in the shear layer separating from the crest due to the Kelvin-Helmholtz instability. They are convected downstream and either interact with the wall or rise to the surfa...

  1. Early Jurassic eolian dune field, Pomperaug basin, Connecticut and related synrift deposits

    E-Print Network [OSTI]

    LeTourneau, Peter M.

    Early Jurassic eolian dune field, Pomperaug basin, Connecticut and related synrift deposits eolian sandstone in the Pomperaug basin, Connecticut is noteworthy because it is the most significant from the Hartford (Connecticut, USA), Fundy (Nova Scotia, Canada), and Argana (Morocco) basins. Using

  2. Projet Long Unitag Dveloppement d'une application Facebook compatible mobile et manipulation de QR Code

    E-Print Network [OSTI]

    Grigoras, .Romulus

    Projet Long Unitag Développement d'une application Facebook compatible mobile et manipulation de QR création de QR Code pour les utilisateurs de Facebook, et notamment de QR Codes permettant d'accéder à certaines pages Facebook (ajout d'ami, like de pages, etc.). L'outil doit être simplissime à prendre en main

  3. A unified approach to understanding permeability in sea ice Solving the mystery of booming sand dunes Entering into the "greenhouse century": A case study from Switzerland

    E-Print Network [OSTI]

    Golden, Kenneth M.

    and microstructural character- istics. Brine transport facilitates sea ice production from freezing of flooded ice connectivity. We find that sea ice displays universal transport properties remarkably similar to crustal rocks transport in terms of temperature and salinity, and permit more realistic representations of sea ice

  4. Modeling Urban Storm-Water Quality Treatment: Model Development and Application to a Surface Sand Filter

    E-Print Network [OSTI]

    management; Urban areas; Hydraulic models; Sand, filter; Parameters; Estimation; Water treatment. Author and nutrient removal is often low. Water quality performance of the sand filter can be evaluated by comparing a surface sand filter. If the water quality attributes of the sand filter can be confidently mod- eled

  5. DC WRRC Report No. 178 AN EXPERIMENTAL STUDY OF THE OPTIMAL THICKNESS OF A SAND

    E-Print Network [OSTI]

    District of Columbia, University of the

    FILTER WATER QUALITY STRUCTURE July 1994 D.C. Water Resources Research Center University of the District OF THE OPTIMAL THICKNESS OF A SAND LAYER IN A SAND FILTER WATER QUALITY STRUCTURE Submitted by: Farshad Amini THICKNESS OF A SAND LAYER IN A SAND FILTER WATER QUALITY STRUCTURE July 1994 D.C. Water Resources Research

  6. Effect of mould expansion on pattern allowances in sand casting of steel

    E-Print Network [OSTI]

    Beckermann, Christoph

    properties of the sand and the solidifying steel. Such hindered shrinkage of restrained casting featuresEffect of mould expansion on pattern allowances in sand casting of steel F. Peters1 , R. Voigt2 , S. Z. Ou3 and C. Beckermann*3 For steel castings produced in sand moulds, the expansion of the sand

  7. Implementing Per Bak's Sand Pile Model as a Two-Dimensional Cellular Automaton

    E-Print Network [OSTI]

    Tesfatsion, Leigh

    -dimensional cellular automaton (checkerboard model) · Pseudo-code description of Per Bak's sand pile model (Winslow

  8. Numerical Modeling of Hydraulic Fracturing in Oil Sands

    E-Print Network [OSTI]

    2008-11-16

    Hydraulic fracturing is a widely used and e cient technique for enhancing oil extraction from heavy oil sands ..... phenomenon are the main issues involved in hydraulic fracturing. ..... energy ux due to conduction and convection: Lei = @T. @xi.

  9. Study of properties of sand asphalt using a torsional rheometer 

    E-Print Network [OSTI]

    Kasula, Lavan Kumar Reddy

    2004-11-15

    The modeling of Sand Asphalt and experiments to measure their rheological properties are of vital concern to many industrial processes especially highway and roadway pavement construction industry. A variety of hot mix asphalt mixtures are used...

  10. Bathymetric evolution of sand bed forms under partially standing waves

    E-Print Network [OSTI]

    Landry, Blake Jude

    2004-01-01

    Experiments were conducted in a large wave flume where the interaction between water waves and a movable sand bed were investigated. Monochromatic and poly- chromatic waves of specified amplitudes and period were generated ...

  11. SANDIA REPORT SAND2013-3556 Unlimited Release

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    SANDIA REPORT SAND2013-3556 Unlimited Release April 2013 Designing a Water Leasing Market for the Mimbres River, New Mexico Made Possible by a WaterSMART Water and Energy...

  12. Acoustic detection of Immiscible Liquids in Sand

    SciTech Connect (OSTI)

    Geller, Jil T.; Kowalsky, Michael B.; Seifert, Patricia K.; Nihei, Kurt T.

    1999-03-01

    Laboratory cross-well P-wave transmission at 90 kHz was measured in a 61 cm diameter by 76 cm tall water-saturated sand pack, before and after introducing a non-aqueous phase organic liquid (NAPL) (n-dodecane). In one experiment NAPL was introduced to form a lens trapped by a low permeability layer; a second experiment considered NAPL residual trapped behind the front of flowing NAPL. The NAPL caused significant changes in the travel time and amplitude of first arrivals, as well as the generation of diffracted waves arriving after the direct wave. The spatial variations in NAPL saturation obtained from excavation at the end of the experiment correlated well with the observed variations in the P-wave amplitudes and travel times. NAPL residual saturation changes from NAPL flow channels of 3 to 4% were detectable and the 40 to 80% NAPL saturation in the NAPL lens was clearly visible at acoustic frequencies. The results of these experiments demonstrate that small NAPL saturations may be more easily detected with amplitude rather than travel time data, but that the relationships between the amplitude changes and NAPL saturation maybe more complex than those for velocity.

  13. Creating and maintaining a gas cap in tar sands formations

    DOE Patents [OSTI]

    Vinegar, Harold J. (Bellaire, TX); Karanikas, John Michael (Houston, TX); Dinkoruk, Deniz Sumnu (Houston, TX); Wellington, Scott Lee (Bellaire, TX)

    2010-03-16

    Methods for treating a tar sands formation are disclosed herein. Methods for treating a tar sands formation may include providing heat to at least part of a hydrocarbon layer in the formation from one or more heaters located in the formation. Pressure may be allowed to increase in an upper portion of the formation to provide a gas cap in the upper portion. At least some hydrocarbons are produced from a lower portion of the formation.

  14. Feasibility study report for the Imperial Valley Ethanol Refinery: a 14. 9-million-gallon-per-year ethanol synfuel refinery utilizing geothermal energy

    SciTech Connect (OSTI)

    Not Available

    1981-03-01

    The construction and operation of a 14,980,000 gallon per year fuel ethanol from grain refinery in the Imperial Valley of California is proposed. The Imperial Valley Ethanol Refinery (refinery) will use hot geothermal fluid from geothermal resources at the East Mesa area as the source of process energy. In order to evaluate the economic viability of the proposed Project, exhaustive engineering, cost analysis, and financial studies have been undertaken. This report presents the results of feasibility studies undertaken in geothermal resource, engineering, marketing financing, management, environment, and permits and approvals. The conclusion of these studies is that the Project is economically viable. US Alcohol Fuels is proceeding with its plans to construct and operate the Refinery.

  15. SiPMs characterization and selection for the DUNE far detector photon detection system

    E-Print Network [OSTI]

    Yujing Sun; Jelena Maricic

    2015-11-15

    The Deep Underground Neutrino Experiment (DUNE) together with the Long Baseline Neutrino Facility (LBNF) hosted at the Fermilab will provide a unique, world-leading program for the exploration of key questions at the forefront of neutrino physics and astrophysics. CP violation in neutrino flavor mixing is one of its most important potential discoveries. Additionally, the experiment will determine the neutrino mass hierarchy and precisely measure the neutrino mixing parameters which may potentially reveal new fundamental symmetries of nature. Moreover, the DUNE is also designed for the observation of nucleon decay and supernova burst neutrinos. The photon detection (PD) system in the DUNE far detector provides trigger for cosmic backgrounds, enhances supernova burst trigger efficiency and improves the energy resolution of the detector. The DUNE adopts the technology of liquid argon time projection chamber (LArTPC) that requires the PD sensors, silicon photomultipliers (SiPM), to be carefully chosen to not only work properly in cryostat, but also meet certain specifications for the life of the experiment. A comprehensive testing of SiPMs in cryostat is necessary since the datasheet provided by the manufactures in the market does not cover this temperature regime. This paper gives the detailed characterization results of SenSL C-Series 60035 SiPMs, including gain, dark count rate (DCR), cross-talk and after-pulse rate. Characteristic studies on SiPMs from other vendors are also discussed in order to avoid any potential problems associated with using a single source. Moreover, the results of the ongoing mechanical durability tests are shown for the current candidate, SenSL B/C-Series 60035 SiPMs.

  16. Process-based modeling of the aeloian environment at the dune scale

    SciTech Connect (OSTI)

    Stam, J.M.T. (IGG-TNO, Delft (Netherlands))

    1993-09-01

    Process-based models are quantitative models that simulate the physical process of sedimentation with the objective of reconstructing the spatial distribution, stratification, and properties of the subsurface. In this study, a two-dimensional, process-based model of the aeolian environment, at the dune-interdune scale, has been developed. Sedimentation is governed by the variation of wind velocity over the topography, which is calculated analytically. Velocity calculations are coupled to a sediment transport equation, to determine where erosion and deposition occur. The resulting change in topography determines a new velocity field, which is then calculated. Features that the model simulates include ripple formation and dune migration, as well as the resulting internal sedimentary structures. Process-based models can be used as tool to help interpret structures in ancient formations. This model has been applied specifically to reconstruct dune-interdune sequences observed in cores from the Rotliegendes, localized in the southern Permian basin (North Sea). The interdune strata are characterized by a low permeability. A flow simulation has been done on the aeolian section generated by the model, showing the effect of these heterogeneities on fluid flow.

  17. Investigation of guided waves propagation in pipe buried in sand

    SciTech Connect (OSTI)

    Leinov, Eli; Cawley, Peter; Lowe, Michael J.S.

    2014-02-18

    The inspection of pipelines by guided wave testing is a well-established method for the detection of corrosion defects in pipelines, and is currently used routinely in a variety of industries, e.g. petrochemical and energy. When the method is applied to pipes buried in soil, test ranges tend to be significantly compromised because of attenuation of the waves caused by energy radiating into the soil. Moreover, the variability of soil conditions dictates different attenuation characteristics, which in-turn results in different, unpredictable, test ranges. We investigate experimentally the propagation and attenuation characteristics of guided waves in pipes buried in fine sand using a well characterized full scale experimental apparatus. The apparatus consists of an 8 inch-diameter, 5.6-meters long steel pipe embedded over 3 meters of its length in a rectangular container filled with fine sand, and an air-bladder for the application of overburden pressure. Longitudinal and torsional guided waves are excited in the pipe and recorded using a transducer ring (Guided Ultrasonics Ltd). Acoustic properties of the sand are measured independently in-situ and used to make model predictions of wave behavior in the buried pipe. We present the methodology and the systematic measurements of the guided waves under a range of conditions, including loose and compacted sand. It is found that the application of overburden pressure modifies the compaction of the sand and increases the attenuation, and that the measurement of the acoustic properties of sand allows model prediction of the attenuation of guided waves in buried pipes with a high level of confidence.

  18. Heavy liquid beneficiation developed for Alabama tar sands

    SciTech Connect (OSTI)

    Not Available

    1986-12-01

    The tar sand deposits in the State of Alabama contain about 1.8 billion barrels of measured and more than 4 billion barrels of speculative in-place bitumen. A comprehensive research program is in progress for the separation of bitumen from these deposits. In general, Alabama tar sands are oil wetted, low grade and highly viscous in nature. In view of these facts, a beneficiation strategy has been developed to recover bitumen enriched concentrate which can be used as a feed material for further processing. Heavy liquid separation tests and results are discussed. A 77% zinc bromide solution, specific gravity of 2.4, was used for the tests. 2 figures.

  19. Milling of Sand Blocks to Make Casting Moulds

    SciTech Connect (OSTI)

    Lopez de Lacalle, L. N.; Rodriguez, A.; Lamikiz, A.; Penafiel, F. J. [Department of Mechanical Engineering, University of the Basque Country, ETSII, c/Alameda de Urquijo s/n, 48013 Bilbao (Spain)

    2011-01-17

    In this paper a full procedure to make moulds in sand for direct casting of metallic parts is presented. The technology aims at unique pieces or art pieces, where only one prototype or components is required, but lead times are much reduced. The key of the procedure is to achieve enough tool life when milling with carbide tools, avoiding the risk of sand destruction or damage.The use of inverse techniques is a common input due to the industrial sectors where the direct milling is interesting. Two examples of moulds are presented, evaluating times and costs. A special study of tool wear is also presented.

  20. Western Gas Sands Project: stratigrapy of the Piceance Basin

    SciTech Connect (OSTI)

    Anderson, S. (comp.)

    1980-08-01

    The Western Gas Sands Project Core Program was initiated by US DOE to investigate various low permeability, gas bearing sandstones. Research to gain a better geological understanding of these sandstones and improve evaluation and stimulation techniques is being conducted. Tight gas sands are located in several mid-continent and western basins. This report deals with the Piceance Basin in northwestern Colorado. This discussion is an attempt to provide a general overview of the Piceance Basin stratigraphy and to be a useful reference of stratigraphic units and accompanying descriptions.

  1. Case study of a multiple sand waterflood, Hewitt Unit, OK

    SciTech Connect (OSTI)

    Ruble, D.B.

    1982-03-01

    Twenty-two sands in the Hewitt field have been flooded simultaneously by Exxon Co. U.S.A.'s Hewitt Unit, and a case history of the operations is detailed. A multiple sand waterflood project requires special optimization methods to improve oil recovery. Injection and production surveillance programs and optimization methods used are highlighted. These include injection wellbore design, injection distribution, production stimulation, polymer augmented injection, and infill drilling. Successful application of these techniques has increased ultimate recovery from this waterflood operation. 3 refs.

  2. X-ray computed-tomography observations of water flow through anisotropic methane hydrate-bearing sand

    E-Print Network [OSTI]

    Seol, Yongkoo

    2010-01-01

    of gas hydrate-bearing sand. J. Geophys. Res. 110 (B01311).in a partially saturated sand, The 229th ACS NationalScale Partially Saturated Sand Sample, Journal of Petroleum

  3. 19`eme Congr`es Francais de Mecanique Marseille, 24-28 ao^ut 2009 Qu'est-ce qui determine la taille des dunes?

    E-Print Network [OSTI]

    Claudin, Philippe

    taille des dunes? M´ecanismes et lois d'´echelle. B. Andreotti, P. Claudin et A. Fourri`ere Laboratoire des rides aquatiques et des dunes ´eoliennes. Nous montrons qu'un lit plat est lin´eairement instable´edimentaire. Au-del`a du r´egime lin´eaire, les rides ou dunes interagissent et grossissent jusqu'`a une taille

  4. Well-to-Wheels Greenhouse Gas Emissions of Canadian Oil Sands...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Well-to-Wheels Greenhouse Gas Emissions of Canadian Oil Sands Products: Implications for U.S. Petroleum Fuels Title Well-to-Wheels Greenhouse Gas Emissions of Canadian Oil Sands...

  5. Experimental investigation of sand consolidation using high-temperature alkaline solution 

    E-Print Network [OSTI]

    Moreno Romero, Fidel Enrique

    2000-01-01

    An experimental study was conducted to better understand the sand consolidation process under high-temperature alkaline solution. Wilmington Tar sand samples were successfully consolidated in the laboratory using high-temperature (250-260?C...

  6. Hot alkaline treatment to stimulate and consolidate the heavy oil Bachaquero-01 sand 

    E-Print Network [OSTI]

    Valera Villarroel, Cesar Amabilis

    2005-02-17

    An experimental study was conducted to verify experimentally whether sand consolidation by high-temperature alkaline treatment was possible in the heavy oil Bachaquero-01 reservoir. The experiments were conducted using sand samples from a core taken...

  7. Emissions from Heavy-Duty Diesel Engine with EGR using Oil Sands...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Heavy-Duty Diesel Engine with EGR using Oil Sands Derived Fuels Emissions from Heavy-Duty Diesel Engine with EGR using Oil Sands Derived Fuels 2003 DEER Conference Presentation:...

  8. In situ recovery of oil from Utah tar sand: a summary of tar sand research at the Laramie Energy Technology Center

    SciTech Connect (OSTI)

    Marchant, L.C.; Westhoff, J.D.

    1985-10-01

    This report describes work done by the United States Department of Energy's Laramie Energy Technology Center from 1971 through 1982 to develop technology for future recovery of oil from US tar sands. Work was concentrated on major US tar sand deposits that are found in Utah. Major objectives of the program were as follows: determine the feasibility of in situ recovery methods applied to tar sand deposits; and establish a system for classifying tar sand deposits relative to those characteristics that would affect the design and operation of various in situ recovery processes. Contents of this report include: (1) characterization of Utah tar sand; (2) laboratory extraction studies relative to Utah tar sand in situ methods; (3) geological site evaluation; (4) environmental assessments and water availability; (5) reverse combustion field experiment, TS-1C; (6) a reverse combustion followed by forward combustion field experiment, TS-2C; (7) tar sand permeability enhancement studies; (8) two-well steam injection experiment; (9) in situ steam-flood experiment, TS-1S; (10) design of a tar sand field experiment for air-stream co-injection, TS-4; (11) wastewater treatment and oil analyses; (12) economic evaluation of an in situ tar sand recovery process; and (13) appendix I (extraction studies involving Utah tar sands, surface methods). 70 figs., 68 tabs.

  9. Depositional environment of the "stringer sand" member, Lower Tuscaloosa Formation (Cretaceous), Mallalieu field, Mississippi 

    E-Print Network [OSTI]

    Cook, Billy Charles

    1968-01-01

    with the lower Unit being subdivided into an upper "sand and shale section" a middle "marine section", and a lower "massive sand section". The Mississippi Geological Society (1957) subdivided the subsurface Tuscaloosa Group into the Upper, Marine, and Lower...) described the Lower Tuscaloosa Formation of southern Mississippi as a unit of "rapidly alternating sands and shales of shallow marine origin, overlying a nearly unbroken sand sec- tion of still shallower marine or continental origin". Braunstein ai. so...

  10. The application of triaxial compression tests to the design of sand-asphalt paving mixtures 

    E-Print Network [OSTI]

    Ritter, Leo J

    1940-01-01

    of Changes in Sand. Orading upon the JLngle of Internal Friction III. Effect of the Initial Void Ratio upon ths ' ingle of Internal friction (Pine Sand. ) . . . . . . . Page 31 35 IV. Xffect oi Dust on the Angle of Internal Jriction in Sand Nixes... after Failure . . , 24 S. Nffsct of Changes in Sand. Grading on the Angle of Internal Friction . . . . . . '. . . . . . . . . . . . . . . . . 32 Relation between ths Angle of Internal Friction ank Initial Yolk Ratio (Fine Sank...

  11. Figure 1. Typical Slow Sand Filter Schematic Supernatant Water

    E-Print Network [OSTI]

    Figure 1. Typical Slow Sand Filter Schematic Headspace Supernatant Water Schmutzdecke Raw water for support and also at the bottom an underdrain system collects the filtered water (Figure 1). As water of SSFs to marginal source waters, filter harrowing and faster methods of filter scraping have greatly

  12. Tree Harvest in an Experimental Sand Ecosystem: Plant Effects on

    E-Print Network [OSTI]

    Vermont, University of

    generation mechanisms. Prior to harvest, K soil- water concentrations were relatively uniform with depthTree Harvest in an Experimental Sand Ecosystem: Plant Effects on Nutrient Dynamics and Solute to determine how trees affect the behavior of these nutrients in soil water, both during growth and after

  13. Nonlinear dynamics of Aeolian sand ripples Leonid Prigozhin

    E-Print Network [OSTI]

    Prigozhin, Leonid

    Nonlinear dynamics of Aeolian sand ripples Leonid Prigozhin Center for Energy and Environmental grains move by long tra- jectories that end in high-energy impacts with the surface. These impacts take on the wind strength and grain size 5 . After an impact, a saltating grain usually rebounds sufficiently high

  14. SANDIA REPORT SAND86 -1623 Unlimited Release UC -60

    E-Print Network [OSTI]

    for the 34 Meter Vertical Axis Wind Turbine Test Bed Located at Bushland, Texas William A. Stephenson SAND 86-1623 Unlimited Release TEST P M FOR THE 34 METfiR VERTICAL AXIS WIND TEST BED LIXATED Albuquerque, New Mexico 87185 A plan is presented for the testing and evaluation of a new 500 kw vertical axis

  15. SAND98-2823C ALAA 99-0047

    E-Print Network [OSTI]

    was acquired using accelerometers mounted on the rotor of a parked and undamaged horizontal-axis wind turbine is a photo of one of the three wind turbine blades on the rotor. This vertically orientated bladeSAND98-2823C ALAA 99-0047 Application of Damage Detection Techniques using Wind Turbine Modal Data

  16. COSTS MODELS IN DESIGN AND MANUFACTURING OF SAND CASTING PRODUCTS

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    COSTS MODELS IN DESIGN AND MANUFACTURING OF SAND CASTING PRODUCTS Nicolas PERRY Ass. Prof., IRCCy.Bernard@irccyn.ec-nantes.fr Abstract: In the early phases of the product life cycle, the costs controls became a major decision tool difficulties, we will present an approach using a concept of cost entity related to the design and realization

  17. Formation of Two-Dimensional Sand Ripples under Laminar Shear Flow Vincent Langlois and Alexandre Valance

    E-Print Network [OSTI]

    Formation of Two-Dimensional Sand Ripples under Laminar Shear Flow Vincent Langlois and Alexandre sand bed patterns under a laminar and steady shear flow. Several issues are addressed here: (i fluid is investigated theoretically. The sand transport is described taking into account both the local

  18. One-dimensional inversion of airborne electromagnetic data: application to oil sands exploration

    E-Print Network [OSTI]

    Farquharson, Colin G.

    One-dimensional inversion of airborne electromagnetic data: application to oil sands exploration, and Larry Mewhort. · Richard Kellett, formerly of Komex International. #12;Oil sands in Canada #12;Source: Mark Savage, "Oil Sands Characteristics - Geology," 9 April 2002 Wabasca Calgary Edmonton Cold Lake

  19. RESPONSES OF BENTHIC MICROORGANISMS (THECAMOEBIANS) TO OIL SANDS PROCESS-AFFECTED MATERIALS; PROVIDING

    E-Print Network [OSTI]

    Patterson, Timothy

    RESPONSES OF BENTHIC MICROORGANISMS (THECAMOEBIANS) TO OIL SANDS PROCESS-AFFECTED MATERIALS an important role in reclamation options for fluid tailings (OSPW/M) at surface oil sands operations. Through of oil sands operation have been compared. An index of response to stress has been compiled with the goal

  20. Achieving Canada's climate targets and the impacts on Alberta's oil sands industry

    E-Print Network [OSTI]

    Achieving Canada's climate targets and the impacts on Alberta's oil sands industry by Maximilian Management 608 Title of Project: Achieving Canada's climate targets and the impacts on Alberta's oil sands of domestic and international climate efforts on Alberta's oil sands industry. The modelling results predict

  1. Nuclear Technology & Canadian Oil Sands: Integration of Nuclear Power with In-Situ Oil Extraction

    E-Print Network [OSTI]

    Nuclear Technology & Canadian Oil Sands: Integration of Nuclear Power with In-Situ Oil Extraction A for a Canadian oil sands extraction facility using Steam-Assisted Gravity Drainage (SAGD) technology. The energy to produce steam as well as electricity for the oil sands facility; and (3) using the reactor to produce

  2. Rain splash of dry sand revealed by high-speed imaging and sticky paper splash targets

    E-Print Network [OSTI]

    Mudd, Simon Marius

    Rain splash of dry sand revealed by high-speed imaging and sticky paper splash targets David Jon by raindrop impacts. We use high-speed imaging of drop impacts on dry sand to describe the drop (2007), Rain splash of dry sand revealed by high-speed imaging and sticky paper splash targets, J

  3. Air quality over the Canadian oil sands: A first assessment using satellite observations

    E-Print Network [OSTI]

    Boersma, Folkert

    -measurement trends and increases in annual bitumen production. An increase in SO2 was also found, but given larger. 1. Introduction [2] Vast deposits of bitumen­oil mixed with sand, clay, and water generally referred to as "oil sands" (or "tar sands")­ are located in the Canadian province of Alberta (see Figure 1a). The oil

  4. Extending the SAND Spatial Database System for the Visualization of Three-

    E-Print Network [OSTI]

    Samet, Hanan

    Extending the SAND Spatial Database System for the Visualization of Three- Dimensional Scientific of the SAND (Spatial and Nonspatial Data) spatial database system is described as is its use for data found supported by SAND involve locating spatial objects in the order of their distance from other spatial objects

  5. SAND: Relation between the Database and Printed Maps Erik Tjong Kim Sang

    E-Print Network [OSTI]

    Sang, Erik Tjong Kim

    SAND: Relation between the Database and Printed Maps Erik Tjong Kim Sang Meertens Institute erik.tjong.kim.sang@meertens.knaw.nl May 16, 2014 1 Introduction SAND, the Syntactic Atlas of the Dutch Dialects, is a collection of maps database which can be accessed via a web interface: DynaSAND [1]. The printed maps are not exactly the same

  6. VECTOR/PATHOGEN/HOST INTERACTION, TRANSMISSION Virulence of a Malaria Parasite, Plasmodium mexicanum, for Its Sand

    E-Print Network [OSTI]

    Schall, Joseph J.

    mexicanum, for Its Sand Fly Vectors, Lutzomyia vexator and Lutzomyia stewarti (Diptera: Psychodidae) JOS. J, for its vectors, two species of sand Ã?y (Diptera: Psychodi- dae), Lutzomyia vexator (Coquillett 1907 rate from egg to eclosion differed for the two species when noninfected. For both sand Ã?y species

  7. Naturally Saline Boreal Communities as Models for Reclamation of Saline Oil Sand Tailings

    E-Print Network [OSTI]

    Macdonald, Ellen

    Naturally Saline Boreal Communities as Models for Reclamation of Saline Oil Sand Tailings Brett G. Purdy,1,2 S. Ellen Macdonald,1 and Victor J. Lieffers1 Abstract Reclaimed landscapes after oil sands found on the predisturbance land- scape can be established on all reclaimed landscapes after oil sands

  8. Under consideration for publication in J. Fluid Mech. 1 A two species model of aeolian sand

    E-Print Network [OSTI]

    Under consideration for publication in J. Fluid Mech. 1 A two species model of aeolian sand 30 January 2004) The transport of sand by the wind results from the equilibrium between the erosion governing the saturation of the sand flux are investigated theo- retically. We first demonstrate

  9. Shear band in sand with spatially varying density Ronaldo I. Borja a,n

    E-Print Network [OSTI]

    Borja, Ronaldo I.

    Shear band in sand with spatially varying density Ronaldo I. Borja a,n , Xiaoyu Song a , Amy L Keywords: Bifurcation Digital Image Correlation Heterogeneous sand Shear band Strain localization a b s t r for the selection of the persistent shear band in a symmetrically loaded localizing sand body. We combine

  10. Stress Corrosion Cracking and Delayed Increase in Penetration Resistance after Dynamic Compaction of Sand

    E-Print Network [OSTI]

    Michalowski, Radoslaw L.

    of Sand R.L. Michalowski1 , F. ASCE and S. S. Nadukuru2 , Student Member, ASCE 1 University of Michigan Engineering, Ann Arbor, MI 48109-2125, U.S.A.; siddu@umich.edu ABSTRACT Dynamically compacted sands exhibit on the process of stress corrosion cracking of the micro-morphological features on the surface of the sand grains

  11. Animating Sand, Mud, and Snow Robert W. Sumner James F. O'Brien Jessica K. Hodgins

    E-Print Network [OSTI]

    O'Brien, James F.

    Animating Sand, Mud, and Snow Robert W. Sumner James F. O'Brien Jessica K. Hodgins College footprints made by a runner in sand, mud, and snow as well as bicycle tire tracks, a bicycle crash- sulting motion, we compare the simulated footprints to video footage of human footprints in sand. Keywords

  12. MEASUREMENTS AND MODELING OF LWIR SPECTRAL EMISSIVITY OF CONTAMINATED QUARTZ SAND

    E-Print Network [OSTI]

    Kerekes, John

    MEASUREMENTS AND MODELING OF LWIR SPECTRAL EMISSIVITY OF CONTAMINATED QUARTZ SAND John Kerekes measurements for samples of SiO2 (sand) with and without 0.3% (by weight) of SF96 (poly dimethyl siloxane) oil. Two different sand particle size ranges were considered. The modeling was performed using a micro

  13. DISTRIBUTION OF SAND LANCE, AlVIMODYTES SP., LARVAE ON THE CONTINENTAL SHELF FROM

    E-Print Network [OSTI]

    DISTRIBUTION OF SAND LANCE, AlVIMODYTES SP., LARVAE ON THE CONTINENTAL SHELF FROM CAPE COD TO CAPE of one species of sand lance, which rasembled AlIllllodytes lIlarillUS exactly, were collected along abundance of sand lance larval' occurred in winter off the mouths of the principal estuaries (southern New

  14. Effect of Sand Supply on Transport Rates in a Gravel-Bed Channel

    E-Print Network [OSTI]

    Curran, Joanna C.

    Effect of Sand Supply on Transport Rates in a Gravel-Bed Channel Joanna C. Curran, A.M.ASCE,1 depth, and gravel feed rate, sand feed rates were varied from 0.16 to 6.1 times that of gravel. The bed slope decreased with increasing sand supply, indicating that the gravel could be transported at the same

  15. GROWTH RATE OF THE SAND CRAB, EMERITA ANALOGA, (HIPPIDAE) IN TWO DIFFERENT ENVIRONMENTS

    E-Print Network [OSTI]

    GROWTH RATE OF THE SAND CRAB, EMERITA ANALOGA, (HIPPIDAE) IN TWO DIFFERENT ENVIRONMENTS CRAIG of the present work. This study is an analysis of the growth rate in two nearby populations of the sand crab. tions are not considered here. The crab normally lives between high and low tide marks buried in sand

  16. The impact of sand slugs against beams and plates: Coupled discrete particle/finite element simulations

    E-Print Network [OSTI]

    Wadley, Haydn

    The impact of sand slugs against beams and plates: Coupled discrete particle/finite element/continuum coupling Dynamic loading a b s t r a c t The impact of a slug of dry sand particles against a metallic for shock mitigation. The sand particles interact via a combined linear-spring-and-dashpot law whereas

  17. Marinomonas basaltis sp. nov., a marine bacterium isolated from black sand

    E-Print Network [OSTI]

    Bae, Jin-Woo

    Marinomonas basaltis sp. nov., a marine bacterium isolated from black sand Ho-Won Chang,1 Seong black sand in Soesoggak, Jeju island, Korea. The strain, designated J63T , was oxidase- and catalase- negative, rod-shaped bacterial strain, J63T , was isolated recently from black sand from Soesoggak, Jeju

  18. CSC2522 Course Project Michael Tao 6.1 Rendering Wet Sand

    E-Print Network [OSTI]

    Toronto, University of

    CSC2522 Course Project Michael Tao 6.1 Rendering Wet Sand 6.1.1 Goals The primary goal of this project was to implement a method for rendering sand as a wet porous medium with water flowing into it from within PBRT. The final result was a video of sand being wetted by water particles flowing through

  19. Vibrio areninigrae sp. nov., a marine bacterium isolated from black sand

    E-Print Network [OSTI]

    Bae, Jin-Woo

    Vibrio areninigrae sp. nov., a marine bacterium isolated from black sand Ho-Won Chang,1 Seong Woon strain was isolated from black sand collected from Soesoggak, Jeju island, Korea. The strain, designated , was recently isolated from black sand collected from Soesoggak, Jeju island, Korea. In the present study

  20. The sand seatrout (Cynoscion are-narius) and the silver seatrout (C.

    E-Print Network [OSTI]

    24 The sand seatrout (Cynoscion are- narius) and the silver seatrout (C. nothus) from the family investigated. Sand seatrout use inshore waters extensively but also move offshore seasonally to evade. Furthermore, information is lim- ited on whether the distribution of sand seatrout offshore correlates

  1. Sand Drawings and Gaussian Graphs Erik D. Demaine Martin L. Demaine

    E-Print Network [OSTI]

    Demaine, Erik

    Sand Drawings and Gaussian Graphs Erik D. Demaine Martin L. Demaine Computer Science and AI@cs.mcgill.ca Abstract Sand drawings form a part of many cultural artistic traditions. Depending on the part of the world uncover a bridge between sand drawings and Gaussian graphs, leading to a variety of new mathematical

  2. Numerical Simulations of the Wave Bottom Boundary Layer over Sand Ripples

    E-Print Network [OSTI]

    Slinn, Donald

    Numerical Simulations of the Wave Bottom Boundary Layer over Sand Ripples by Thomas Pierro A Thesis over sand ripples, and to compare the results with flows over a smooth bed to determine how wave energy energy dissipation rates are quantified and a better understanding of oscillatory flow over sand ripples

  3. The dynamic response of edge clamped plates loaded by spherically expanding sand shellsq

    E-Print Network [OSTI]

    Wadley, Haydn

    The dynamic response of edge clamped plates loaded by spherically expanding sand shellsq Kumar P and water saturated sand has been investigated, both experimentally and via a particle based simulation methodology. The spherically expanding sand shell is generated by detonating a sphere of explosive surrounded

  4. The Relationship between Virulence and Transport of Listeria monocytogenes in Saturated Sand Columns

    E-Print Network [OSTI]

    Collins, Gary S.

    The Relationship between Virulence and Transport of Listeria monocytogenes in Saturated Sand efficiencies of the seven strains Correlate L. monocytogenes retention in sand to the varying pathogenicity of the isolates Hypothesis Increasingly virulent strains of L. monocytogenes demonstrate higher adherence to sand

  5. Multicomponent Transport of Sulfate in a Goethite-Silica Sand System

    E-Print Network [OSTI]

    Sparks, Donald L.

    Multicomponent Transport of Sulfate in a Goethite-Silica Sand System at Variable pH and Ionic sand column. The agreement between the experiments and the predictions is very good, especially of a goethite-coated silica sand column, which is similar to systems used in our earlier work (1, 2

  6. Sand column impact onto a Kolsky pressure bar , N.A. Fleck a

    E-Print Network [OSTI]

    Wadley, Haydn

    Sand column impact onto a Kolsky pressure bar S. Park a , T. Uth a , N.A. Fleck a , H.N.G. Wadley b loading Sand-structure interaction a b s t r a c t A laboratory-based methodology to launch cylindrical sand slugs at high velocities is developed. The methodology generates well-characterised soil ejecta

  7. Velocities of deep water reservoir sands De-hua Han, University of Houston

    E-Print Network [OSTI]

    and shale, which is not focus for this study. Sorting HP Shale ShallowDeep Sorting HP Shale Sorting HP Shale sands. Grain density is 2.65 gm/cc, typical for clean sands. Measured gas permeability ranged from 100 have revealed gradual effect of clay content on porosity and velocity of shaly sands and sandy shales

  8. The extraction of bitumen from western oil sands. Final report, July 1989--September 1993

    SciTech Connect (OSTI)

    Oblad, A.G.; Bunger, J.W.; Dahlstrom, D.A.; Deo, M.D.; Fletcher, J.V.; Hanson, F.V.; Miller, J.D.; Seader, J.D.

    1994-03-01

    Research and development of surface extraction and upgrading processes of western tar sands are described. Research areas included modified hot water, fluidized bed, and rotary kiln pyrolysis of tar sands for extraction of bitumen. Bitumen upgrading included solvent extraction of bitumen, and catalytic hydrotreating of bitumen. Characterization of Utah tar sand deposits is also included.

  9. Shallow ground-water flow, water levels, and quality of water, 1980-84, Cowles Unit, Indiana Dunes National Lakeshore

    SciTech Connect (OSTI)

    Cohen, D.A.; Shedlock, R.J.

    1986-01-01

    The Cowles Unit of Indiana Dunes National Lakeshore in Porter County, northwest Indiana, contains a broad dune-beach complex along the southern shoreline of Lake Michigan and a large wetland, called the Great Marsh, that occupies the lowland between the shoreline dunes and an older dune-beach complex farther inland. Water levels and water quality in the surficial aquifer were monitored from 1977 to 1984 near settling ponds on adjacent industrial property at the western end of the Cowles Unit. Since 1980, when the settling pond bottoms were sealed, these intradunal lowlands contained standing water only during periods of high snowmelt or rainfall. Water level declines following the cessation of seepage ranged from 6 feet at the eastern-most settling pond to nearly 14 feet at the western-most pond. No general pattern of water table decline was observed in the Great Marsh or in the shoreline dune complex at distances > 3,000 ft east or north of the settling ponds. Since the settling ponds were sealed, the concentration of boron has decreased while concentrations of cadmium, arsenic, zinc, and molybdenum in shallow ground-water downgradient of the ponds show no definite trends in time. Arsenic, boron and molybdenum have remained at concentrations above those of shallow groundwater in areas unaffected by settling pond seepage. 11 refs., 10 figs., 1 tab.

  10. Scalar-field quintessence by cosmic shear: CFHT data analysis and forecasts for DUNE

    E-Print Network [OSTI]

    Carlo Schimd; Ismael Tereno

    2006-12-01

    A light scalar field, minimally or not-minimally coupled to the metric field, is a well-defined candidate for the dark energy, overcoming the coincidence problem intrinsic to the cosmological constant and avoiding the difficulties of parameterizations. We present a general description of the weak gravitational lensing valid for every metric theory of gravity, including vector and tensor perturbations for a non-flat spatial metric. Based on this description, we investigate two minimally-coupled scalar field quintessence models using VIRMOS-Descart and CFHTLS cosmic shear data, and forecast the constraints for the proposed space-borne wide-field imager DUNE.

  11. Southern/Northern California Coastal Processes Annotated Bibliography: Coast of California Storm and Tidal Waves Study

    E-Print Network [OSTI]

    US Army Corps of Engineers, Los Angeles District, Planning Division, Coastal Resources Branch

    1987-01-01

    vegetation has proved to be the most effective and efficient means of stabilizing coastal sand dunes.

  12. SUR LA POSSIBILIT D'UTILISATION D'UNE CHAMBRE A BULLES A PROPANE POUR L'TUDE DES RACTIONS NUCLAIRES

    E-Print Network [OSTI]

    Boyer, Edmond

    175 A. SUR LA POSSIBILITÉ D'UTILISATION D'UNE CHAMBRE A BULLES A PROPANE POUR L'ÉTUDE DES RÉACTIONS. - Mise au point et étude des caractéristiques du fonctionnement d'une chambre à bulles à propane de 6 135 MeV. Abstract. 2014 Adjustment and studies of some characteristics of a 6 litre propane bubble

  13. A study of the stress-strain response of sand 

    E-Print Network [OSTI]

    Bigham, Robert Eric

    1969-01-01

    -Strain Response of Sand. (!lay 1969) Robert E. Bigham, B. S. , Texas A8N University Directed by: Dr. Wayne A. Dunlap The deformation of soil under load is profoundly affected by environmental conditions and stress history, in contrast to some common... engineering materials. In pavements and some other soil engineering structures, deformation analagous to elastic deformation in steel (as distinguished from that caused by densification under long-time loading, e. g. , consolidation of clays) is a point...

  14. EA-1978: Sand Creek Winds, McCone County, Montana

    Broader source: Energy.gov [DOE]

    Western Area Power Administration (Western) is preparing an EA to analyze the potential environmental impacts of the proposed Sand Creek Winds Project, a 75-MW wind farm between the towns of Circle and Wolf Point in McCone County, Montana. The proposed wind farm would interconnect to Western’s existing Wolf Point to Circle 115-kV transmission line approximately 18 miles north of Wolf Point.

  15. Sand Springs, Oklahoma: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onRAPID/Geothermal/Exploration/ColoradoRemsenburg-Speonk,Sage Resources JumpDimas,Rey,Sanctuary, Texas:Sand Springs,

  16. Insulation from basaltic stamp sand. Final technical report

    SciTech Connect (OSTI)

    Williams, F. D.

    1981-04-01

    A Midwest Appropriate Technology Grant was awarded to determine the technical and economic feasibility of producing mineral-fiber insulation directly from extensive deposits of basaltic sand produced during former mining and milling operations in the Keweenaw Peninsula region of Michigan's Upper Peninsula. The amounts of local basaltic sands available and representative chemical compositions were determined. The variation of viscosity with temperature and chemical composition was estimated. Samples were melted and either pulled or blown into fiber. In all cases fiber could be made with a reasonable tensile strength to ensure usefulness. It was concluded that it was technically feasible to produce fibers from basaltic stamp sands of the Upper Peninsula of Michigan. A technical feasibility study using published data, a cost and design analysis of a basalt fiber production plant, a market survey of fiber needs, and an economic analysis for investing in a basalt fiber venture was undertaken. These studies concluded that the local production of basaltic insulation was both feasible and economically reasonable. It was suggested that the plant be located in a region of greater population density with lower utility costs. A representative one-third of these studies is included as appendices A, B, C, and D.

  17. The extraction of bitumen from western oil sands: Volume 1. Final report

    SciTech Connect (OSTI)

    Oblad, A.G.; Dahlstrom, D.A.; Deo, M.D.; Fletcher, J.V.; Hanson, F.V.; Miller, J.D.; Seader, J.D.

    1997-11-26

    The program is composed of 20 projects, of which 17 are laboratory bench or laboratory pilot scale processes or computer process simulations that are performed in existing facilities on the University of Utah campus in north-east Salt Lake City. These tasks are: (1) coupled fluidized-bed bitumen recovery and coked sand combustion; (2) water-based recovery of bitumen; (3) oil sand pyrolysis in a continuous rotary kiln reactor; (4) oil sand pyrolysis in a large diameter fluidized bed reactor; (5) oil sand pyrolysis in a small diameter fluidized bed reactor; (6) combustion of spent sand in a transport reactor; (7) recovery and upgrading of oil sand bitumen using solvent extraction methods; (8) fixed-bed hydrotreating of Uinta Basin bitumens and bitumen-derived hydrocarbon liquids; (9) ebullieted bed hydrotreating of bitumen and bitumen derived liquids; (10) bitumen upgrading by hydropyrolysis; (11) evaluation of Utah`s major oil sand deposits for the production of asphalt, high-energy jet fuels and other specialty products; (12) characterization of the bitumens and reservoir rocks from the Uinta Basin oil sand deposits; (13) bitumen upgrading pilot plant recommendations; (14) liquid-solid separation and fine tailings thickening; (15) in-situ production of heavy oil from Uinta Basin oil sand deposits; (16) oil sand research and development group analytical facility; and (17) process economics. This volume contains an executive summary and reports for five of these projects. 137 figs., 49 tabs.

  18. Assessment of the KE Basin Sand Filter Inventory In Support of Hazard Categorization

    SciTech Connect (OSTI)

    Ross, Steven B.; Young, Jonathan

    2005-09-28

    In 1978, the water cleaning system for the KE Basin was upgraded by adding a sand filter and ion exchange columns. Basin water containing finely divided solids is collected by three surface skimmers and pumped to the sand filter. Filtrate from the sand filter is further treated in the ion exchange modules. The suspended solids accumulate in the sand until the pressure drop across the filter reaches established operating limits, at which time the sand filter is backwashed. The backwash is collected in the NLOP, where the solids are allowed to settle as sludge. Figure 2-1 shows a basic piping and instrumentation diagram depicting the relationship among the basin skimmers, sand filter, and NLOP. During the course of deactivation and decommissioning (D&D) of the K-Basins, the sand filter and its media will need to be dispositioned. The isotopic distribution of the sludge in the sand filter has been estimated in KE Basin Sand Filter Monolith DQO (KBC-24705). This document estimates the sand filter contribution to the KE hazard categorization using the data from the DQO.

  19. The extraction of bitumen from western oil sands: Volume 2. Final report

    SciTech Connect (OSTI)

    Oblad, A.G.; Dahlstrom, D.A.; Deo, M.D.; Fletcher, J.V.; Hanson, F.V.; Miller, J.D.; Seader, J.D.

    1997-11-26

    The program is composed of 20 projects, of which 17 are laboratory bench or laboratory pilot scale processes or computer process simulations that are performed in existing facilities on the University of Utah campus in north-east Salt Lake City. These tasks are: (1) coupled fluidized-bed bitumen recovery and coked sand combustion; (2) water-based recovery of bitumen; (3) oil sand pyrolysis in a continuous rotary kiln reactor; (4) oil sand pyrolysis in a large diameter fluidized bed reactor; (5) oil sand pyrolysis in a small diameter fluidized bed reactor; (6) combustion of spent sand in a transport reactor; (7) recovery and upgrading of oil sand bitumen using solvent extraction methods; (8) fixed-bed hydrotreating of Uinta Basin bitumens and bitumen-derived hydrocarbon liquids; (9) ebullieted bed hydrotreating of bitumen and bitumen derived liquids; (10) bitumen upgrading by hydropyrolysis; (11) evaluation of Utah`s major oil sand deposits for the production of asphalt, high-energy jet fuels and other specialty products; (12) characterization of the bitumens and reservoir rocks from the Uinta Basin oil sand deposits; (13) bitumen upgrading pilot plant recommendations; (14) liquid-solid separation and fine tailings thickening; (15) in-situ production of heavy oil from Uinta Basin oil sand deposits; (16) oil sand research and development group analytical facility; and (17) process economics. This volume contains reports on nine of these projects, references, and a bibliography. 351 refs., 192 figs., 65 tabs.

  20. The effect of wind speedup in the formation of transverse dune fields Hiroshi Momiji *, **, Ricardo CarreteroGonz'alez***,

    E-Print Network [OSTI]

    The effect of wind speedup in the formation of transverse dune fields Hiroshi Momiji *, **, Ricardo to a uni­directional wind regime, is developed. In a previous formulation, two distinct problems were found is overcome by introducing a wind speedup factor, which can be accounted for by adding a term to the original

  1. Estimation vido haute frquence de la topographie inter-tidale d'une plage sableuse : application la

    E-Print Network [OSTI]

    Estimation vidéo haute fréquence de la topographie inter- tidale d'une plage sableuse : application outil vidéo d'estimation haute fréquence de la topographie inter-tidale. Cet outil est basé sur le suivi : We present a tool to estimate inter-tidal topography using video images. This tool is based

  2. European Journal of Mechanics B/Fluids 25 (2006) 348359 Evolution of a model dune in a shear flow

    E-Print Network [OSTI]

    Lagrée, Pierre-Yves

    2006-01-01

    front matter 2005 Elsevier SAS. All rights reserved. doi:10.1016/j.euromechflu.2005.09.002 #12;K in revised form 11 July 2005; accepted 19 September 2005 Available online 24 October 2005 Abstract We present of the dune is too small, or if the saturation length is too large, or if the threshold is too small. 2005

  3. Sand transport and deposition in horizontal multiphase trunklines of subsea satellite developments

    SciTech Connect (OSTI)

    Oudeman, P. )

    1993-11-01

    Gravel packing is unattractive as a way to protect against the effects of sand production in subsea wells because it involves additional completion costs, loss of productivity, and difficulties in subsequent recompletion/well servicing operations. On the other hand, omitting gravel packs means that subsea developments must be designed and operated so that they can tolerate sand production. An experimental study was carried out on sand transport and deposition in multiphase flow in modeled subsea flowlines to address the problem and sand collection in horizontal trunklines, which could lead to reduced line throughput, pigging problems, enhanced pipe-bottom erosion, or even blockage. This study led to the definition of a new model for sand transport in multiphase flow, which was used to establish the risk of sand deposition in trunklines connecting a subsea development to nearby production platform.

  4. Preliminary examination of oil bonding at sand surfaces and its influence on hot water separation

    SciTech Connect (OSTI)

    Hupka, J.; Budzich, M.; Miller, J.D.

    1991-01-01

    The efficiency of water-based separation of oil from sand particles is dependent on the nature of the oil-sand association and a preliminary examination of this bonding has been completed. The degree of hydration of the sand surface at the time of contact with oil was related to the subsequent efficiency of the oil-sand separation process. Variables which influence hot water separation were correlated by multiple linear regression, and a second order experimental model was obtained. The processing temperature appeared to be the most significant variable, followed by digestion time and pH. Oil-coated sand particles which had intrinsic water left on their surface during sample preparation were easily processed in hot water separation experiments, and 64 to 90% of the oil was removed. On the other hand, only 1 to 23% separation and oil recovery was possible when a calcinated sand-oil mixture was used.

  5. Preliminary examination of oil bonding at sand surfaces and its influence on hot water separation

    SciTech Connect (OSTI)

    Hupka, J.; Budzich, M.; Miller, J.D.

    1991-12-31

    The efficiency of water-based separation of oil from sand particles is dependent on the nature of the oil-sand association and a preliminary examination of this bonding has been completed. The degree of hydration of the sand surface at the time of contact with oil was related to the subsequent efficiency of the oil-sand separation process. Variables which influence hot water separation were correlated by multiple linear regression, and a second order experimental model was obtained. The processing temperature appeared to be the most significant variable, followed by digestion time and pH. Oil-coated sand particles which had intrinsic water left on their surface during sample preparation were easily processed in hot water separation experiments, and 64 to 90% of the oil was removed. On the other hand, only 1 to 23% separation and oil recovery was possible when a calcinated sand-oil mixture was used.

  6. Investigation of the thermal conductivity of unconsolidated sand packs containing oil, water, and gas 

    E-Print Network [OSTI]

    Gore, David Eugene

    1958-01-01

    INVESTIGATION OF THE THERNAL CONDUCTIVITY OF UNCONSOLIDATED SAND PACKS CONTAINING OIL, WATER, AND GAS A Thesis David E. Gore Submitted to the Graduate School of the Agricultural and Nechanical College oi' Texas in Partial fulfillment... and thxee-phase fluid saturation on the thermal conductivity of sand packs. The current research was conducted using a sand and lubricating oil on which related studies had been pexfoxmed. The thermal conductivity measuxements were made undex condi...

  7. Laboratory Analysis of a New Sand Consolidation Material for Oilfield Applications 

    E-Print Network [OSTI]

    Filbrandt, Joseph Daniel

    2012-02-14

    a liquid material which will create a grain to grain contact that will bind individual sand grains together. Most consolidation treatments contain a preflush to clean and wet the surface, the consolidating system to bind the sand grains and give... residual strength, and, finally, an overflush to ensure the formation is still able to produce fluids. With the successful placement of this fluid, the sand grains will be locked in placed so that they will not be produced. The technology has gone...

  8. Landfill impacts on aquatic plant communities and tissue metal levels at Indiana Dunes National Lakeshore

    SciTech Connect (OSTI)

    Stewart, P.M. [National Biological Service, Porter, IN (United States). Lake Michigan Ecological Station; Scribailo, R.W. [Purdue Univ.North Central, Westville, IN (United States). Section of Biology and Chemistry

    1995-12-31

    One important environmental issue facing Northwest Indiana and park management at Indiana Dunes National Lakeshore (INOU) is the contamination of water, sediment and biota by persistent toxic substances. Aquatic plant communities were used to evaluate the water/organismal quality of the Grand Calumet Lagoons and two dunal ponds (pannes) at Gary, Indiana, which are partially located in the Miller Woods Unit of INDU. The lagoon is divided into several areas, the USX Lagoon is located between sections of a large industrial landfill (steel slag and other material). The Marquette Lagoon is located further away from the landfill and tends to be upgradient from the landfill. The West Panne (WP) is located next to the landfill, while the East Panne (EP) is separated from the landfill and the WP by a high dune ridge. Plant populations shift toward fewer submergent aquatics, with a higher abundance of tolerant taxa in the western section of the USX Lagoon. These differences are supported by cluster analysis. Heavy metals in root tissue of Scirpus americanus and other plant species from the pannes were significantly higher than those found in shoots. Shoot tissue metal levels in plants collected from the lagoons were higher than root tissue metal levels. The WP site has the most elevated tissue metal levels for most metals assayed, while the EP site shows similar contaminant levels. The plant distributions observed and tissue metal concentrations measured suggest that INDU`s aquatic plant community has been affected by the industrial landfill and that there exists a hydrological connection between the ponds.

  9. Pore-scale mechanisms of gas flow in tight sand reservoirs

    E-Print Network [OSTI]

    Silin, D.

    2011-01-01

    a homoge- neous reservoir the condensate saturation will bewater saturation distribution in a tight gas sand reservoirreservoir, the accumulating condensate can become mobile after reaching a certain saturation

  10. Non-Incineration Treatment to Reduce Benzene and VOC Emissions from Green Sand Molding Systems

    SciTech Connect (OSTI)

    Fred S. Cannon; Robert C. Voigt

    2002-06-28

    Final report describing laboratory, pilot scale and production scale evaluation of advanced oxidation systems for emissions and cost reduction in metal casting green sand systems.

  11. Pore-scale mechanisms of gas flow in tight sand reservoirs

    E-Print Network [OSTI]

    Silin, D.

    2011-01-01

    include tight gas sands, gas shales, and coal-bed methane.Figure 3. Although the gas-shale production grows at a

  12. Determining sand-body geometries for waterflood reservoirs: Examples from Oklahoma

    SciTech Connect (OSTI)

    Kreisa, R.D.; Pinero, E. )

    1987-02-01

    Waterflood projects require an accurate knowledge of reservoir geometry and well-to-well continuity. However, sandstones with thin, multiple-pay zones can be extremely difficult to correlate with confidence. Two case studies of Pennsylvanian sandstones in Oklahoma illustrate how a model for the depositional history of such reservoirs can be an effective tool for determining reservoir continuity. In contrast, correlation criteria such as similar wireline log signatures and relative sand-body thicknesses are not reliable in many situations. In Southwest Logan field (Beaver County), 5 to 15-ft thick reservoir sands formed as shallow marine sand ridges. Their dimensions were approximated from height-to-width ratios of modern sand ridges. Then the reservoir sands were mapped using wireline logs and core data. Individual reservoir sands were approximately 1-2 km wide and stacked en echelon vertically. Thus, a line-drive waterflood pattern oriented parallel to the axes of the ridges is recommended. Tatums field (Carter County) consists of 5 to 50-ft thick sandstones deposited in various deltaic environments. Distributary channel sands have good continuity downdip, but are narrow and lenticular across depositional strike. Crevasse splay and other bay-fill sands were deposited marginal to the channels and are extremely discontinuous. This depositional model can be used to improve flood patterns for these sands, leading to improved sweep efficiency. In both examples, for effective mapping, the depositional facies models have been used to register reservoir quality and wireline log signatures.

  13. Prediction of Liquefaction Potential of Dredge Fill Sand by DCP and Dynamic Probing

    SciTech Connect (OSTI)

    Alam, Md. Jahangir [Assistant Professor, Department of Civil Engineering, Bangladesh University of Engineering and Technology, Dhaka-1000 (Bangladesh); Azad, Abul Kalam; Rahman, Ziaur [Graduate Students, Department of Civil Engineering, Bangladesh University of Engineering and Technology, Dhaka-1000 (Bangladesh)

    2008-07-08

    From many research it is proved that liquefaction potential of sand is function of mainly relative density and confining pressure. During routine site investigations, high-quality sampling and laboratory testing of sands are not feasible because of inevitable sample disturbance effects and budgetary constraints. On the other hand quality control of sand fill can be done by determining in situ density of sand in layer by layer which is expensive and time consuming. In this paper TRL DCP (Transportation Research Laboratory Dynamic Cone Penetration) and DPL (Dynamic Probing Light) are calibrated to predict the relative density of sand deposit. For this purpose sand of known relative density is prepared in a calibration chamber which is a mild steel cylinder with diameter 0.5 m and height 1.0 m. Relative density of sand is varied by controlling height of fall and diameter of hole of sand discharge bowl. After filling, every time DPL and DCP tests are performed and for every blow the penetration of cone is recorded. N10 is then calculated from penetration records. Thus a database is compiled where N10 and relative densities are known. A correlation is made between N{sub 10} and relative density for two types of sand. A good correlation of N{sub 10} and relative density is found.

  14. Production from multiple zones of a tar sands formation

    DOE Patents [OSTI]

    Karanikas, John Michael; Vinegar, Harold J

    2013-02-26

    A method for treating a tar sands formation includes providing heat to at least part of a hydrocarbon layer in the formation from a plurality of heaters located in the formation. The heat is allowed to transfer from the heaters to at least a portion of the formation. Fluids are produced from the formation through at least one production well that is located in at least two zones in the formation. The first zone has an initial permeability of at least 1 darcy. The second zone has an initial of at most 0.1 darcy. The two zones are separated by a substantially impermeable barrier.

  15. Systems and methods for producing hydrocarbons from tar sands formations

    DOE Patents [OSTI]

    Li, Ruijian (Katy, TX); Karanikas, John Michael (Houston, TX)

    2009-07-21

    A system for treating a tar sands formation is disclosed. A plurality of heaters are located in the formation. The heaters include at least partially horizontal heating sections at least partially in a hydrocarbon layer of the formation. The heating sections are at least partially arranged in a pattern in the hydrocarbon layer. The heaters are configured to provide heat to the hydrocarbon layer. The provided heat creates a plurality of drainage paths for mobilized fluids. At least two of the drainage paths converge. A production well is located to collect and produce mobilized fluids from at least one of the converged drainage paths in the hydrocarbon layer.

  16. Renewable Energy Opportunities at White Sands Missile Range, New Mexico

    SciTech Connect (OSTI)

    Chvala, William D.; Solana, Amy E.; States, Jennifer C.; Warwick, William M.; Weimar, Mark R.; Dixon, Douglas R.

    2008-09-01

    The document provides an overview of renewable resource potential at White Sands Missile Range (WSMR) based primarily upon analysis of secondary data sources supplemented with limited on-site evaluations. The effort was funded by the U.S. Army Installation Management Command (IMCOM) as follow-on to the 2005 DoD Renewable Energy Assessment. This effort focuses on grid-connected generation of electricity from renewable energy sources and also ground source heat pumps (GSHPs) for heating and cooling buildings, as directed by IMCOM.

  17. User`s manual for SNL-SAND-II code

    SciTech Connect (OSTI)

    Griffin, P.J.; Kelly, J.G.; VanDenburg, J.W.

    1994-04-01

    Sandia National Laboratories, in the process of characterizing the neutron environments at its reactor facilities, has developed an enhanced version of W. McElroy`s original SAND-II code. The enhanced input, output, and plotting interfaces make the code much easier to use. The basic physics and operation of the code remain unchanged. Important code enhancements include the interfaces to the latest ENDF/B-VI and IRDF-90 dosimetry-quality cross sections and the ability to use silicon displacement-sensitive devices as dosimetry sensors.

  18. Costs Models in Design and Manufacturing of Sand Casting Products

    E-Print Network [OSTI]

    Perry, Nicolas; Bernard, Alain

    2010-01-01

    In the early phases of the product life cycle, the costs controls became a major decision tool in the competitiveness of the companies due to the world competition. After defining the problems related to this control difficulties, we will present an approach using a concept of cost entity related to the design and realization activities of the product. We will try to apply this approach to the fields of the sand casting foundry. This work will highlight the enterprise modelling difficulties (limits of a global cost modelling) and some specifics limitations of the tool used for this development. Finally we will discuss on the limits of a generic approach.

  19. Costs Models in Design and Manufacturing of Sand Casting Products

    E-Print Network [OSTI]

    Nicolas Perry; Magali Mauchand; Alain Bernard

    2010-11-26

    In the early phases of the product life cycle, the costs controls became a major decision tool in the competitiveness of the companies due to the world competition. After defining the problems related to this control difficulties, we will present an approach using a concept of cost entity related to the design and realization activities of the product. We will try to apply this approach to the fields of the sand casting foundry. This work will highlight the enterprise modelling difficulties (limits of a global cost modelling) and some specifics limitations of the tool used for this development. Finally we will discuss on the limits of a generic approach.

  20. RFC Sand Creek Development LLC | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onRAPID/Geothermal/Exploration/Colorado <RAPID/Geothermal/Water Use/NevadaaTools <REpower Systems AG JumpRFC Sand

  1. Patriotic Sands Form the Science of Summer | GE Global Research

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass mapSpeeding access| Department ofStephenSkinner,PastPatent80 -PatriciaPatriotic Sands

  2. White Sands, New Mexico: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION JEnvironmental Jump to:EA EISTJThinWarsaw,What Is a Small Community WindWhere isSands, New Mexico:

  3. SAND97-8490 UC-404 Unlimited Release

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report:Speeding access toSmall ReactorRaymond Davis,Robert Curl,S E\ ternSAND97-8490

  4. SANDIA REPORT SAND2007-1199P Unlimited Release

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II) byMultidayAlumni > The EnergyRyan REPORT SAND

  5. SANDIA REPORT SAND2007-4352P Unlimited Release

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II) byMultidayAlumni > The EnergyRyan REPORT SAND352P Unlimited Release

  6. SANDIA REPORT SAND2007-4407P Unlimited Release

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II) byMultidayAlumni > The EnergyRyan REPORT SAND352P Unlimited

  7. SANDIA REPORT SAND2014-0687 Unlimited Release

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II) byMultidayAlumni > The EnergyRyan REPORT SAND352P Unlimited4-0687

  8. SANDIA REPORT SAND2014-3416 Unlimited Release

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II) byMultidayAlumni > The EnergyRyan REPORT SAND352P

  9. Consumer culture imperialism

    E-Print Network [OSTI]

    De Carvalho, Marcelo Gon?calves

    2010-01-01

    State Department, Top Secret Cable from Amb. Lincoln Gordon,these documents are Top Secret cables sent by US AmbassadorState Department, Top Secret Cable from Amb. Lincoln Gordon,

  10. Imperial Reservoir KOFA NATIONAL

    E-Print Network [OSTI]

    Laughlin, Robert B.

    National Park El Centro Naval Auxiliary Air Station Yuma Proving Ground Yuma Marine Corps Air Station Twentynine Palms Marine Corps Base Fort Irwin Chocolate Mountain Naval Aerial Gunnery Range Barstow Marine 247 79 79 7 115 62 72 78 79 86 115 163 18 72 74 78 115 18 62 95 371 95 94 247 Solar Energy Study Areas

  11. Consumer culture imperialism

    E-Print Network [OSTI]

    De Carvalho, Marcelo Gon?calves

    2010-01-01

    arquivo/2008/11/26/124/Lula-apela-ao- povo-para-comprar.htmlPresident Luís Ignácio Lula. O Globo On Line. November 06,pib_pode_quebrar_cara_diz_lula-586283015.asp Goulart, João

  12. Characterization of trace gases measured over Alberta oil sands mining operations: 76 speciated C2-C10 volatile organic compounds (VOCs), CO2, CH4, CO, NO, NO2, NOy, O3 and SO2

    E-Print Network [OSTI]

    2010-01-01

    measured over Alberta oil sands mining operations Soc. , 81(reducing bacteria in oil sands fine tail- ings waste, Can.fine tailings from oil sands processing harbour diverse

  13. Characterization of trace gases measured over Alberta oil sands mining operations: 76 speciated C2-C10 volatile organic compounds (VOCs), CO2, CH4, CO, NO, NO2, NOy, O3 and SO2

    E-Print Network [OSTI]

    2010-01-01

    gases measured over Alberta oil sands mining operationsand Lee, P. : Does the Alberta tar sands industry pollute?gases measured over Alberta oil sands mining operations: 76

  14. Niland development project geothermal loan guaranty: 49-MW (net) power plant and geothermal well field development, Imperial County, California: Environmental assessment

    SciTech Connect (OSTI)

    Not Available

    1984-10-01

    The proposed federal action addressed by this environmental assessment is the authorization of disbursements under a loan guaranteed by the US Department of Energy for the Niland Geothermal Energy Program. The disbursements will partially finance the development of a geothermal well field in the Imperial Valley of California to supply a 25-MW(e) (net) power plant. Phase I of the project is the production of 25 MW(e) (net) of power; the full rate of 49 MW (net) would be achieved during Phase II. The project is located on approximately 1600 acres (648 ha) near the city of Niland in Imperial County, California. Well field development includes the initial drilling of 8 production wells for Phase I, 8 production wells for Phase II, and the possible need for as many as 16 replacement wells over the anticipated 30-year life of the facility. Activities associated with the power plant in addition to operation are excavation and construction of the facility and associated systems (such as cooling towers). Significant environmental impacts, as defined in Council on Environmental Quality regulation 40 CFR Part 1508.27, are not expected to occur as a result of this project. Minor impacts could include the following: local degradation of ambient air quality due to particulate and/or hydrogen sulfide emissions, temporarily increased ambient noise levels due to drilling and construction activities, and increased traffic. Impacts could be significant in the event of a major spill of geothermal fluid, which could contaminate groundwater and surface waters and alter or eliminate nearby habitat. Careful land use planning and engineering design, implementation of mitigation measures for pollution control, and design and implementation of an environmental monitoring program that can provide an early indication of potential problems should ensure that impacts, except for certain accidents, will be minimized.

  15. Large-scale stabilized dunes on the High Plains of Colorado: Understanding the landscape response to Holocene climates with the aid of images from space

    SciTech Connect (OSTI)

    Forman, S.L. (Ohio State Univ., Columbus (United States)); Goetz, A.F.H.; Yuhas, R.H. (Univ. of Colorado, Boulder (United States))

    1992-02-01

    Principal-component analysis of Landsat Thematic Mapper images from eastern Colorado reveals stabilized dune fields that are composed of single and compound parabolic dunes, some longer than 10 km. These dunes have been reactivated at least four times in the past 10,000 yr, at ca. 9500 to 5500 yr B.P., 5500 to {gt}4800 yr B.P., 4800 to {gt}1000 yr B.P., and {lt}1000 yr B.P., during droughts that probably exceeded the dry conditions during the 1930s. Dune orientations indicate that these landforms were molded by winds from the northwest, which now dominate during the winter and spring with the passage of Pacific air masses. This study underscores the sensitivity of the landscape of the High Plains to drought conditions, which may become more prevalent because of the anticipated effects of greenhouse warming.

  16. Guide to preparing SAND reports and other communication products : quick reference guide.

    SciTech Connect (OSTI)

    Not Available

    2007-03-01

    This 'Quick Reference Guide' supplements the more complete 'Guide to Preparing SAND Reports and Other Communication Products'. It provides limited guidance on how to prepare SAND Reports at Sandia National Laboratories. Users are directed to the in-depth guide for explanations of processes.

  17. Guide to Preparing SAND Reports and other communication products : quick reference guide.

    SciTech Connect (OSTI)

    Not Available

    2009-10-01

    This Quick Reference Guide supplements the more complete Guide to Preparing SAND Reports and Other Communication Products. It provides limited guidance on how to prepare SAND Reports at Sandia National Laboratories. Users are directed to the in-depth guide for explanations of processes.

  18. Evaluating Energy and Water Saving Opportunities in SAGD Oil Sands Plants via Process Integration

    E-Print Network [OSTI]

    Ahrendt, Wolfgang

    Evaluating Energy and Water Saving Opportunities in SAGD Oil Sands Plants via Process Integration Alberta, Canada are produced as a mix of hydrocarbons (bitumen), clay, sand and water. The resource barrel of bitumen produced which presents water/energy tradeoffs in the design and operation

  19. ARTICLE IN PRESS Oxalate, calcium and ash intake and excretion balances in fat sand rats

    E-Print Network [OSTI]

    Vatnick, Itzick

    ARTICLE IN PRESS Oxalate, calcium and ash intake and excretion balances in fat sand rats (Psammomys and other inorganic matter (ash) intake and excretion in fat sand rats feeding on two different diets/3 of the ash content. In animals feeding on both diets, 65­80% of the oxalate ingested did not appear in urine

  20. Chemistry and Anatomy of the Frontal Gland in Soldiers of the Sand Termite Psammotermes hybostoma

    E-Print Network [OSTI]

    Danchin, Etienne

    Chemistry and Anatomy of the Frontal Gland in Soldiers of the Sand Termite Psammotermes hybostoma of the frontal gland and on the diversity of soldier defensive chemicals in the sand ter- mite, Psammotermes (Crespi, 1994). In termite ancestors, the caste of soldiers evolved as the first altruistic caste, com

  1. Empirical model determines energy required to clean sand from well bore

    SciTech Connect (OSTI)

    Appah, D.; Ichara, M. (Univ. of Port Harcourt (Nigeria))

    1994-02-28

    An empirical hydraulic model has been developed for determining the energy required for cleaning a vertical and nearly vertical well bore plugged with sand particles. The model considers pressure losses and cleanout time and compares sand cleanout time during direct and reverse circulation of water. Good agreement was obtained between the model and experimental results.

  2. Velocities of deep water reservoir sands De-hua Han, University of Houston

    E-Print Network [OSTI]

    Velocities of deep water reservoir sands De-hua Han, University of Houston M. Batzle, Colorado the application for DHI techniques. Summary In deep-water sedimentary processes, compaction is a major force of weakly cemented deep-water sands. Geological compaction and possible weak cementation can reduce porosity

  3. Sand and mud deposited by Hurricane Katrina on Deer Island, Biloxi Bay, Mississippi

    E-Print Network [OSTI]

    Winglee, Robert M.

    Sand and mud deposited by Hurricane Katrina on Deer Island, Biloxi Bay, Mississippi Annaliese A University of Washington Department of Earth and Space Sciences #12;Sand and mud deposited by Hurricane ................................................................................................................. 14 ABSTRACT Hurricane Katrina overwash berms on both sides of Deer Island, Mississippi, include sub

  4. Alberta bound : the interface between Alberta's environmental policies and the environmental management of three Albertan oil sands companies

    E-Print Network [OSTI]

    Lemphers, Nathan C

    2009-01-01

    The Athabasca Oil Sands, located in northeastern Alberta, Canada, were for many years anomalous. Two oil sands operators developed their extraction techniques for 30 years, refining their technology before production became ...

  5. Homogenization of a singularly perturbed degenerated parabolic equation and application to seabed dune and megaripple morphodynamics in tided environment

    E-Print Network [OSTI]

    Faye, Ibrahima; Seck, Diaraf

    2009-01-01

    In this paper we build models for short-term, mean-term and long-term dynamics of dune and megariple morphodynamics. They are models that are degenerated parabolic equations which are, moreover, singularly perturbed. We, then give an existence and uniqueness result for the short-term and mean-term models. This result is based on a time-space periodic solution existence result for degenerated parabolic equation that we set out. Finally the short-term model is homogenized.

  6. Marine carbonate embayment system in an Eolian dune terrain, Permian Upper Minnelusa Formation, Rozet Area, Powder River Basin, Wyoming

    SciTech Connect (OSTI)

    Achauer, C.W.

    1987-05-01

    The eolian origin for Minnelusa sandstones has been stressed in numerous published articles. However, the dolomites that are interbedded with the eolian sandstones have received little attention. Isopach mapping of one of the dolomite units (Dolomite I) reflects a marine embayment system whose individual embayments range from 1/2 to 1 mi in width and trend primarily in a northwest direction. Consistently the embayment dolomites pinch out against the flanks of reworked, low relief, broad, eolian dune ridges. So far, 108 mi/sup 2/ of the Dolomite I marine embayment system have been mapped, but the overall extent of the system is undoubtedly much greater. Dolomite I is rarely cored, but cores from stratigraphically higher embayment dolomites in the upper Minnelusa show that these dolomites display the following, shoaling-upward sequence: (1) subtidal, sparingly fossiliferous dolomite; (2) intertidal, algal-laminated or brecciated or mud-cracked dolomite; and (3) very thin, supratidal, nodular anhydrite. The embayments, therefore, became the sites of marine sabkhas located between eolian dunes. Two main conclusions emerge from this study: (1) the juxtaposition of eolian sandstones and marine dolomites in a tectonically stable area suggests that eustatic sea level changes and a very arid climate were responsible for the marked environmental and lithologic changes observed in the upper Minnelusa, and (2) arid, coastal, evaporitic sabkhas bordered by eolian dunes are known from a number of modern and ancient cases, but marine carbonate embayments and associated evaporitic sabkhas that penetrate deeply into eolian sandstone terrains are rare.

  7. On the relevance of numerical simulations to booming sand

    E-Print Network [OSTI]

    Patrick Richard; Sean Mcnamara; Merline Tankeo

    2012-01-04

    We have performed a simulation study of 3D cohesionless granular flows down an inclined chute. We find that the oscillations observed in [L.E. Silbert, Phys. Rev. Lett., 94, 098002 (2005)] near the angle of repose are harmonic vibrations of the lowest normal mode. Their frequencies depend on the contact stiffness as well as on the depth of the flow. Could these oscillations account for the phenomena of "booming sand"? We estimate an effective contact stiffness from the Hertz law, but this leads to frequencies several times higher than observed. However, the Hertz law also predicts interpenetrations of a few nanometers, indicating that the oscillations frequencies are governed by the surface stiffness, which can be much lower than the bulk one. This is in agreement with previous studies ascribing the ability to sing to the presence of a soft coating on the grain surface.

  8. Measurement of Moisture Content in Sand, Slag, and Crucible Materials

    SciTech Connect (OSTI)

    Gray, J.H.

    1999-09-20

    The deinventory process at Rocky Flats (RFETS) has included moisture content measurements of sand, slag, and crucible (SSC) materials by performing weight loss measurements at 210 degrees - 220 degrees Celsius on representative samples prior to packaging for shipment. Shipping requirements include knowledge of the moisture content. Work at the Savannah River Technology Center (SRTC) showed that the measurement at 210 degrees - 220 degrees Celsius did not account for all of the moisture. The objective of the work in this report was to determine if the measurement at 210 degrees - 220 degrees Celsius at RFETS could be used to set upper bounds on moisture content and therefore, eliminate the need for RFETS to unpack, reanalyze and repack the material.

  9. Preliminary relative permeability estimates of methanehydrate-bearing sand

    SciTech Connect (OSTI)

    Seol, Yongkoo; Kneafsey, Timothy J.; Tomutsa, Liviu; Moridis,George J.

    2006-05-08

    The relative permeability to fluids in hydrate-bearing sediments is an important parameter for predicting natural gas production from gas hydrate reservoirs. We estimated the relative permeability parameters (van Genuchten alpha and m) in a hydrate-bearing sand by means of inverse modeling, which involved matching water saturation predictions with observations from a controlled waterflood experiment. We used x-ray computed tomography (CT) scanning to determine both the porosity and the hydrate and aqueous phase saturation distributions in the samples. X-ray CT images showed that hydrate and aqueous phase saturations are non-uniform, and that water flow focuses in regions of lower hydrate saturation. The relative permeability parameters were estimated at two locations in each sample. Differences between the estimated parameter sets at the two locations were attributed to heterogeneity in the hydrate saturation. Better estimates of the relative permeability parameters require further refinement of the experimental design, and better description of heterogeneity in the numerical inversions.

  10. Preliminary relative permeability estimates of methanehydrate-bearing sand

    SciTech Connect (OSTI)

    Seol, Yongkoo; Kneafsey, Timothy J.; Tomutsa, Liviu; Moridis,George J.

    2006-05-08

    The relative permeability to fluids in hydrate-bearingsediments is an important parameter for predicting natural gas productionfrom gas hydrate reservoirs. We estimated the relative permeabilityparameters (van Genuchten alpha and m) in a hydrate-bearing sand by meansof inverse modeling, which involved matching water saturation predictionswith observations from a controlled waterflood experiment. We used x-raycomputed tomography (CT) scanning to determine both the porosity and thehydrate and aqueous phase saturation distributions in the samples. X-rayCT images showed that hydrate and aqueous phase saturations arenon-uniform, and that water flow focuses in regions of lower hydratesaturation. The relative permeability parameters were estimated at twolocations in each sample. Differences between the estimated parametersets at the two locations were attributed to heterogeneity in the hydratesaturation. Better estimates of the relative permeability parametersrequire further refinement of the experimental design, and betterdescription of heterogeneity in the numerical inversions.

  11. Centrifuge modeling of LNAPL transport in partially saturated sand

    SciTech Connect (OSTI)

    Esposito, G.; Allersma, H.G.B.; Selvadurai, A.P.S.

    1999-12-01

    Model tests were performed at the Geotechnical Centrifuge Facility of Delft University of Technology, The Netherlands, to examine the mechanics of light nonaqueous phase liquid (LNAPL) movement in a partially saturated porous granular medium. The experiment simulated a 2D spill of LNAPL in an unsaturated sand prepared at two values of porosity. The duration of the centrifuge model tests corresponded to a prototype equivalent of 110 days. The choice of modeling a 2D flow together with the use of a transparent container enabled direct visual observation of the experiments. Scaling laws developed in connection with other centrifuge modeling studies were used to support the test results. Tests were conducted at two different centrifuge accelerations to verify, by means of the modeling of models technique, the similitude between the different experiments. The paper presents details of the experimental methodologies and the measuring techniques used to evaluate the final distribution of water and LNAPL content in the soils.

  12. Canada's natural resources industries (particularly oil sands production, hard rock mining and forestry) face local challenges and opportunities

    E-Print Network [OSTI]

    Rosen-Zvi, Michal

    Canada's natural resources industries (particularly oil sands production, hard rock mining and society. For example, oil sands production is pushing innovation in how and where oil can be produced costs, predict maintenance issues and increase safety and environmental performance. As oil sands

  13. Wet-sand impulse loading of metallic plates and corrugated core sandwich panels J.J. Rimoli a

    E-Print Network [OSTI]

    Wadley, Haydn

    Wet-sand impulse loading of metallic plates and corrugated core sandwich panels J.J. Rimoli a , B the mechanical response of edge-clamped sandwich panels subject to the impact of explosively driven wet sand of wet sand placed at different standoff distances. Monolithic plates of the same alloy and mass per unit

  14. Experience with SAND-Tcl: A Scripting Tool for Spatial Databases 1 CLAUDIO ESPERANC A (Contact Author)

    E-Print Network [OSTI]

    Samet, Hanan

    Experience with SAND-Tcl: A Scripting Tool for Spatial Databases 1 CLAUDIO ESPERANC¸ A (Contact. This is illustrated by de- scribing our experience with SAND-Tcl, a scripting tool developed by us for building spatial database applications. SAND-Tcl is an extension of the Tcl embedded scripting language

  15. Measurement of Elastic Modulus of PUNB Bonded Sand as a Function of Temperature J. Thole and C. Beckermann

    E-Print Network [OSTI]

    Beckermann, Christoph

    and distortions in steel casting are particularly sensitive to the elastic modulus of the sand mold. The objective1 Measurement of Elastic Modulus of PUNB Bonded Sand as a Function of Temperature J. Thole and C Measurements of the elastic modulus of PUNB bonded silica sand are performed using a three-point bend test from

  16. Frequency dependent elastic properties and attenuation in heavy-oil sands: comparison between mea-sured and modeled data

    E-Print Network [OSTI]

    Frequency dependent elastic properties and attenuation in heavy-oil sands: comparison between mea) properties of heavy-oil sands over a range of frequencies (2 - 2000Hz) covering the seismic bandwidth and at ultrasonic frequencies (0.8MHz). The measurements were carried on heavy-oil sand sample from Asphalt Ridge

  17. Ecosystem level assessment of the Grand Calumet Lagoons, Indiana Dunes National Lakeshore

    SciTech Connect (OSTI)

    Stewart, P.M. [National Biological Service, Porter, IN (United States)

    1995-12-31

    The Grand Calumet Lagoons make up the eastern section of the Grand Calumet River (GCR), Indiana Harbor and Ship Canal and nearshore Lake Michigan Area of Concern (AOC). The GCR AOC is the only one of the 42 Great Lakes Areas of Concern identified by the International Joint Commission with all 14 designated uses classified as impaired. Included within the boundaries of the Indiana Dunes National Lakeshore (INDU), is the central section of the Grand Calumet Lagoons. A number of biotic and abiotic factors were tested to determine the effects of an industrial landfill that borders the lagoons to assess the potential impact on park resources. Analysis included water quality testing, assessments of macroinvertebrate, fish, algae and aquatic plant communities and contaminant concentrations in water, sediment and plant and fish tissue. Surface water testing found very few contaminants, but significantly higher nutrient levels were found in the water column closest to the landfill. Macroinvertebrate, aquatic plant and fish communities all showed significant impairment in relationship to their proximity to the landfill. Aquatic plant growth habit became limited next to the landfill with certain growth habits disappearing entirely. Aquatic plants collected close to the landfill had high concentrations of several heavy metals in their stems and shoots. Using the index of biotic integrity (IBI), fish community assessment indicated impairment in the areas adjacent to the landfill. Sediments tested at one site had over 12% polycyclic aromatic hydrocarbons (PAH) and carp (Cyprinus carpio) collected from this site had whole fish tissue concentrations over 1 mg/kg PAH.

  18. Realistic simulations of gravitational lensing by galaxy clusters: extracting arc parameters from mock DUNE images

    E-Print Network [OSTI]

    Massimo Meneghetti; Peter Melchior; Andrea Grazian; Gabriella De Lucia; Klaus Dolag; Matthias Bartelmann; Catherine Heymans; Lauro Moscardini; Mario Radovich

    2007-11-21

    We present a newly developed code that allows simulations of optical observations of galaxy fields with a variety of instruments. The code incorporates gravitational lensing effects and is targetted at simulating lensing by galaxy clusters. Our goal is to create the tools required for comparing theoretical expectations with observations to obtain a better understanding of how observational noise affects lensing applications such as mass estimates, studies on the internal properties of galaxy clusters and arc statistics. Starting from a set of input parameters, characterizing both the instruments and the observational conditions, the simulator provides a virtual observation of a patch of the sky. It includes several sources of noise such as photon-noise, sky background, seeing, and instrumental noise. Ray-tracing through simulated mass distributions accounts for gravitational lensing. Source morphologies are realistically simulated based on shapelet decompositions of galaxy images retrieved from the GOODS-ACS archive. According to their morphological class, spectral-energy-distributions are assigned to the source galaxies in order to reproduce observations of each galaxy in arbitrary photometric bands. We illustrate our techniques showing virtual observations of a galaxy-cluster core as it would be observed with the space telescope DUNE, which was recently proposed to ESA within its "Cosmic vision" programme. (Abridged)

  19. Polymer treatments for D Sand water injection wells: Sooner D Sand Unit Weld County, Colorado. Final report, April 1997

    SciTech Connect (OSTI)

    Cannon, T.J.

    1998-10-01

    Polymer-gel treatments in injection wells were evaluated for improving sweep efficiency in the D Sandstone reservoir at the Sooner Unit, Weld County, Colorado. Polymer treatments of injection wells at the Sooner Unit were expected to improve ultimate recovery by 1.0 percent of original-oil-in-place of 70,000 bbl of oil. The Sooner D Sand Unit was a demonstration project under the US Department of Energy Class I Oil Program from which extensive reservoir data and characterization were obtained. Thus, successful application of polymer-gel treatments at the Sooner Unit would be a good case-history example for other operators of waterfloods in Cretaceous sandstone reservoirs in the Denver Basin.

  20. Excess Foundry Sand Characterization and Experimental Investigation in Controlled Low-Strength Material and Hot-Mixing Asphalt

    SciTech Connect (OSTI)

    Pauul J. Tikalsky

    2004-10-31

    This report provides technical data regarding the reuse of excess foundry sand. The report addresses three topics: (1) a statistically sound evaluation of the characterization of foundry sand, (2) a laboratory investigation to qualify excess foundry sand as a major component in controlled low-strength material (CLSM), and (3) the identification of the best methods for using foundry sand as a replacement for natural aggregates for construction purposes, specifically in asphalt paving materials. The survival analysis statistical technique was used to characterize foundry sand over a full spectrum of general chemical parameters, metallic elements, and organic compounds regarding bulk analysis and leachate characterization. Not limited to characterization and environmental impact, foundry sand was evaluated by factor analyses, which contributes to proper selection of factor and maximization of the reuse marketplace for foundry sand. Regarding the integration of foundry sand into CLSM, excavatable CLSM and structural CLSM containing different types of excess foundry sands were investigated through laboratory experiments. Foundry sand was approved to constitute a major component in CLSM. Regarding the integration of foundry sand into asphalt paving materials, the optimum asphalt content was determined for each mixture, as well as the bulk density, maximum density, asphalt absorption, and air voids at N{sub ini}, N{sub des}, and N{sub max}. It was found that foundry sands can be used as an aggregate in hot-mix asphalt production, but each sand should be evaluated individually. Foundry sands tend to lower the strength of mixtures and also may make them more susceptible to moisture damage. Finally, traditional anti-stripping additives may decrease the moisture sensitivity of a mixture containing foundry sand, but not to the level allowed by most highway agencies.