A physically-based integrated numerical model for flow,upland erosion,and contaminant transport in surface-subsurface systems |
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Authors: | ZhiGuo He WeiMing Wu |
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Affiliation: | (1) Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305-2115, USA;(2) Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305-4020, USA;(3) Present address: U.S. Geological Survey, Menlo Park, CA 94025-3561, USA |
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Abstract: | This paper presents a physically-based integrated hydrologic model that can simulate the rainfall-induced 2D surface water
flow, 3D variably saturated subsurface flow, upland soil erosion and transport, and contaminant transport in the surface-subsurface
system of a watershed. The model couples surface and subsurface flows based on the assumption of continuity conditions of
pressure head and exchange flux at the ground, considering infiltration and evapotranspiration. The upland rill/interrill
soil erosion and transport are simulated using a non-equilibrium transport model. Contaminant transport in the integrated
surface and subsurface domains is simulated using advection-diffusion equations with mass changes due to sediment sorption
and desorption and exchanges between two domains due to infiltration, diffusion, and bed change. The model requires no special
treatments at the interface of upland areas and streams and is suitable for wetland areas and agricultural watersheds with
shallow streams. |
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Keywords: | |
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