Integrated surface–groundwater flow modeling: A free-surface overland flow boundary condition in a parallel groundwater flow model |
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| Authors: | Stefan J Kollet Reed M Maxwell |
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| Institution: | Atmospheric, Earth, and Energy Sciences Department, Lawrence Livermore National Laboratory (L-206), 7000 East Avenue, Livermore, CA 94550, USA |
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| Abstract: | Interactions between surface and groundwater are a key component of the hydrologic budget on the watershed scale. Models that honor these interactions are commonly based on the conductance concept that presumes a distinct interface at the land surface, separating the surface from the subsurface domain. These types of models link the subsurface and surface domains via an exchange flux that depends upon the magnitude and direction of the hydraulic gradient across the interface and a proportionality constant (a measure of the hydraulic connectivity). Because experimental evidence of such a distinct interface is often lacking in field systems, there is a need for a more general coupled modeling approach. |
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| Keywords: | Surface-groundwater interactions Overland flow boundary condition Integrated parallel modeling Subsurface heterogeneity Hydrograph uncertainty |
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