An Integrated Media, Integrated Processes Watershed Model – WASH123D: Part 2 – Simulating surface water flows with different water wave models

GUOBIAO HUANG, Gour-Tsyh Yeh & GUOBIAO HUANG
The complete Saint Venant equations/2-D shallow water equations (dynamic wave equations) and the kinematic wave or diffusion wave approximations were implemented for 1-D channel network flow and 2-D overland flow in a watershed model, WASH123D. Careful choice of numerical methods is needed even for the simple kinematic wave model. Motha and Wigham (1995) reported numerical oscillation in Galerkin finite element of kinematic wave overland flow. Since the kinematic wave equation is of pure advection, the...
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