This study presents a finite volume hydrodynamic model for shallow water flow that computes on a coarse grid, but accounts for high-resolution bathymetry and roughness variations on a subgrid. The detailed information can be incorporated by using the assumption of a uniform flow direction and a uniform friction slope within a part of a coarse-grid cell. It is shown in two examples that the results of coarse-grid simulations become as good as high-resolution results, but at much lower computational cost.
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