| Effects of multiscale anisotropy on basin and hyporheic groundwater flow. | |
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MedLine Citation:
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PMID: 21087251 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Various subsurface flow systems exhibit a combination of small-scale to large-scale anisotropy in hydraulic conductivity (K). The large-scale anisotropy results from systematic trends (e.g., exponential decrease or increase) of K with depth. We present a general two-dimensional solution for calculation of topography-driven groundwater flow considering both small- and large-scale anisotropy in K. This solution can be applied to diverse systems with arbitrary head distribution and geometry of the water table boundary, such as basin or hyporheic flow. In a special case, this solution reduces to the well-known Tóth model of uniform isotropic basin. We introduce an integral measure of flushing intensity that quantifies flushing at different depths. Using this solution, we simulate heads and streamlines and provide analyses of flow structure in the flow domain, relevant to basin analyses or hyporheic flow. It is shown that interactions between small-scale anisotropy and large-scale anisotropy strongly control the flow structure. In the classic Tóth flow model, the flushing intensity curves exhibit quasi-exponential decrease with depth. The new measure is capable of capturing subtle changes in the flow structure. Our study shows that both small- and large-scale anisotropy characteristics have substantial effects that need to be integrated into analysis of topography-driven flow. |
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Authors:
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Vitaly A Zlotnik; M Bayani Cardenas; Daniel Toundykov |
Publication Detail:
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Type: Journal Article Date: 2010-11-18 |
Journal Detail:
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Title: Ground water Volume: 49 ISSN: 1745-6584 ISO Abbreviation: Ground Water Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-06-23 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9882886 Medline TA: Ground Water Country: United States |
Other Details:
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Languages: eng Pagination: 576-83 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 The Author(s). Journal compilation © 2010 National Ground Water Association. |
Affiliation:
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Department of Geological Sciences, University of Texas at Austin, Austin, TX 78712; cardenas@jsg.utexas.edu Department of Mathematics, University of Nebraska-Lincoln, Lincoln, NE 68588; dtoundykov@math.unl.edu. |
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