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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Supported by the University of Mississippi and the USDA Agricultural Research Service
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He, Z., Wu, W. A physically-based integrated numerical model for flow, upland erosion, and contaminant transport in surface-subsurface systems. Sci. China Ser. E-Technol. Sci. 52, 3391–3400 (2009). https://doi.org/10.1007/s11431-009-0335-6
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DOI: https://doi.org/10.1007/s11431-009-0335-6