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Title: Upscaling coupled pore-scale reactive transport processes to the continuum scale

Abstract

No abstract prepared.

Authors:
;
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
894370
Report Number(s):
CONF-ERSP2006-22
TRN: US200701%%339
Resource Type:
Conference
Resource Relation:
Conference: Annual Environmental Remediation Sciences Program PI Meeting, April 3-5, 2006, Warrenton, VA
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ENVIRONMENTAL TRANSPORT; POROUS MATERIALS; SCALING LAWS

Citation Formats

Lichtner, Peter C., and Qinjun Kang. Upscaling coupled pore-scale reactive transport processes to the continuum scale. United States: N. p., 2006. Web.
Lichtner, Peter C., & Qinjun Kang. Upscaling coupled pore-scale reactive transport processes to the continuum scale. United States.
Lichtner, Peter C., and Qinjun Kang. Wed . "Upscaling coupled pore-scale reactive transport processes to the continuum scale". United States. doi:. https://www.osti.gov/servlets/purl/894370.
@article{osti_894370,
title = {Upscaling coupled pore-scale reactive transport processes to the continuum scale},
author = {Lichtner, Peter C. and Qinjun Kang},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Apr 05 00:00:00 EDT 2006},
month = {Wed Apr 05 00:00:00 EDT 2006}
}

Conference:
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  • Abstract not provided.
  • The focus of the project is the development of scientifically defensible approaches for upscaling reactive transport models (RTM) through a detailed understanding of U(VI) desorption across several spatial scales: bench-, intermediate-, and field-scales. The central hypothesis of the project is that the development of this methodology will lead to a scientifically defensible approach for conceptual model development for multicomponent RTM at contaminated DOE sites, leading to predictive transport simulations with reduced uncertainty.
  • Environmental systems exhibit a range of complexities which exist at a range of length and mass scales. Within the realm of radionuclide fate and transport, much work has been focused on understanding pore scale processes where complexity can be reduced to a simplified system. In describing larger scale behavior, the results from these simplified systems must be combined to create a theory of the whole. This process can be quite complex, and lead to models which lack transparency. The underlying assumption of this approach is that complex systems will exhibit complex behavior, requiring a complex system of equations to describemore » behavior. This assumption has never been tested. The goal of the experiments presented is to ask the question: Do increasingly complex systems show increasingly complex behavior? Three experimental tanks at the intermediate scale (Tank 1: 2.4m x 1.2m x 7.6cm, Tank 2: 2.4m x 0.61m x 7.6cm, Tank 3: 2.4m x 0.61m x 0.61m (LxHxW)) have been completed. These tanks were packed with various physical orientations of different particle sizes of a uranium contaminated sediment from a former uranium mill near Naturita, Colorado. Steady state water flow was induced across the tanks using constant head boundaries. Pore water was removed from within the flow domain through sampling ports/wells; effluent samples were also taken. Each sample was analyzed for a variety of analytes relating to the solubility and transport of uranium. Flow fields were characterized using inert tracers and direct measurements of pressure head. The results show that although there is a wide range of chemical variability within the flow domain of the tank, the effluent uranium behavior is simple enough to be described using a variety of conceptual models. Thus, although there is a wide range in variability caused by pore scale behaviors, these behaviors appear to be smoothed out as uranium is transported through the tank. This smoothing of uranium transport behavior transcends many of the physical and chemical heterogeneities added to the tank experiments.« less