Author(s): Gangfeng Wu, Kefeng Zhang
Linked Author(s): Gangfeng Wu
Keywords: Central upwind method, bed erosion, sediment transport, shallow water equations, finite volume method
Abstract: A two-dimensional coupled flow-sediment transport model based on a triangular grid is developed to simulate flows over an erodible bed involving wet-dry fronts. In the present study, the shallow water equations that consider the effects of sediment transport and bed change on flow are adopted to calculate bed erosion and sediment transport. The model uses central upwind scheme, which is a type of Riemann-problem-solver-free method for hyperbolic conservation laws which is used to compute mass and momentum flux at interface. The non-equilibrium approach is adopted for the total-load sediment transport. The developed model is capable of being well balanced and preserving the computed water depth to be non-negative, which is important for accurate and efficient simulation of morphological problems. The effectiveness and robustness of proposed model are validated against two sets of experimental data. Results show that the model generally predicts well of the flow characteristics over movable beds, the induced sediment transport and bed changes
Year: 2017