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Title: Model Discrepancy in Dakota.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the SIAM Conference on Computational Science, Engineering and Mathematics held February 27 - March 3, 2017 in Atlanta, GA.
Country of Publication:
United States

Citation Formats

Maupin, Kathryn, and Swiler, Laura Painton. Model Discrepancy in Dakota.. United States: N. p., 2017. Web.
Maupin, Kathryn, & Swiler, Laura Painton. Model Discrepancy in Dakota.. United States.
Maupin, Kathryn, and Swiler, Laura Painton. Wed . "Model Discrepancy in Dakota.". United States. doi:.
title = {Model Discrepancy in Dakota.},
author = {Maupin, Kathryn and Swiler, Laura Painton},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}

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  • Abstract not provided.
  • The Rival and Midale subintervals (Charles Formation, Upper Mississippian), north-central Burke County, North Dakota, represent two relative sea level fluctuations. Updip (northeast), the Rival subinterval contains fine to medium-bedded and chicken-wire anhydrite with interbedded algal bindstone that was deposited on supratidal flats. Basinward (southwest), the lithology changes to oncolitic, peloidal, intraclastic grainstone/packstone that was deposited in intertidal and subtidal restricted lagoonal environments. Evaporites precipitated in the sediment of the intertidal to shallow subtidal restricted lagoonal environment. Overlying the Rival subinterval is skeletal wackestone and packstone of the lower Midale subinterval. The presence of normal-marine fauna (crinoids, brachiopods, trilobites, rugose andmore » tabulate coral) indicates a significant relative sea level transgression occurred following deposition of the Rival. The middle and upper Midale subinterval consists of intensely burrowed dolowackestone and dolomudstone that contain a less diversified faunal assemblage. Overlying the Midale carbonates is a transitional zone of calcareous shale and dolomite that grades upward into mottled (burrowed.) and finely laminated microgranular dolomite and anhydrite. The upper Midale section represents a relative sea level regression (shoreline progradation). Updip (northeast) reservoirs produce from the Midale carbonates, which are sealed laterally and vertically by calcarous shale and microgranular dolomitic anhydrite of the Midale Evaporite. Downdip (southwest), the Rival produces from porous grainstone, which is sealed laterally by intertidal/supratidal carbonates and evaporites, resulting in a stratigraphic trap. Vuggy and intergranular porosity are the major porosity types in the Rival grainstone, and moldic and intercrystalline porosity are dominant in the Midale dolowackestone.« less
  • The drilling boom of the early to mid-1980s allowed many small operators to participate in the drilling of shallow wells in the Wasatch Plateau and Castle Valley of east-central Utah. The gas producing Ferron Sandstone Member of the Mancos Shale was the primary objective, with many operators opting to drill and additional 300-800 ft to also test the Dakota Group. Success was encountered within the Ferron objective in numerous wells. This flurry of drilling by these small operators has produced a wealth of data that now allows deltaic systems within the Ferron to be delineated, along with potential hydrocarbon-producing trends.more » Hydrocarbon potential of the Dakota Group also has been examined in this study. This study incorporates subsurface, structural, and stratigraphic data from the Cretaceous Ferron Sandstone Member of the Mancos Shale and the Dakota Group into a hydrocarbon exploration model. In addition to identifying specific areas for exploration, this model examines the effect of continental tectonism on Ferron deposition, and makes recommendations for improving drilling methodology.« less
  • Current computational models for proton exchange membrane fuel cells (PEMFCs) include a large number of parameters such as boundary conditions, material properties, and numerous parameters used in sub-models for membrane transport, two-phase flow and electrochemistry. In order to successfully use a computational PEMFC model in design and optimization, it is important to identify critical parameters under a wide variety of operating conditions, such as relative humidity, current load, temperature, etc. Moreover, when experimental data is available in the form of polarization curves or local distribution of current and reactant/product species (e.g., O2, H2O concentrations), critical parameters can be estimated inmore » order to enable the model to better fit the data. Sensitivity analysis and parameter estimation are typically performed using manual adjustment of parameters, which is also common in parameter studies. We present work to demonstrate a systematic approach based on using a widely available toolkit developed at Sandia called DAKOTA that supports many kinds of design studies, such as sensitivity analysis as well as optimization and uncertainty quantification. In the present work, we couple a multidimensional PEMFC model (which is being developed, tested and later validated in a joint effort by a team from Penn State Univ. and Sandia National Laboratories) with DAKOTA through the mapping of model parameters to system responses. Using this interface, we demonstrate the efficiency of performing simple parameter studies as well as identifying critical parameters using sensitivity analysis. Finally, we show examples of optimization and parameter estimation using the automated capability in DAKOTA.« less