Author(s): Jennifer G Duan
Linked Author(s): Jennifer G. Duan
Keywords: Computational hydraulics, CFD model, flooding, sediment transport, erosion
Abstract: CHRE2D is a two-dimensional hydrodynamic and sediment transport model that simulates surface flow routing and sediment transport using numerical solutions of shallow water equations and the kinematic or diffusion wave approximation. The shallow water equations are discretized by the first-order Godunov-type finite volume method. The stability analysis showed that the friction source term increased exponentially as the flow depth was very small. This breaks the balance between the friction and the slope source terms. An approximate solution to the momentum equation, kinematic or diffusion wave approximation, are introduced to compensate this balance. This technique enables the numerical model is accurate, robust and stable for both very shallow overland (e. g. , 10-10 m) and concentrated channel flows. The resulted CHRE2D model is capable of simulating both hydrological flow (e. g. , surface flow routing) and hydraulic flow (e. g. , dam break), which has not been achieved in similar commercial software, such as FLO2D, ARM2D. Additionally, the CHRE2D model implemented the Grass-type sediment transport formula to simulate the total sediment load in both overland flow and channel flow
Year: 2017