Numerical modeling of dam-break water flow with wetting and drying change based on unstructured grids

An unstructured finite-volume model is presented for simulating dam-break water flows over complex topographies.The model uses the Roe's approximate Riemann solution in the calculation of flow flux,the characteristic decomposition method is used for upwind scheme in dealing with the bed slope source term,and the semi-implicit approach is used for the friction source terms.A robust procedure is adapted to efficiently and accurately simulate the movement of a wet/dry boundary.The established model shows good stability and accuracy as it is tested with two sets of measured data,hence it can be used to simulate dam-break water flows over complex topographies.