Impact of Village Resistance Values on Simulating Results of Flood Routing in Floodplains

摘要

2-D hydrodynamic model using unstructured triangular meshes was first established. And the model was verified against the analytical solutions and experimental data of dam-break flows in laboratory. Finally, the model was employed to preliminarily simulate inundated floods routing in Lankao and Dongming floodplains of Lower Yellow River (LYR), and the impact of roughness value in village regions on modeling results was thoroughly analyzed. The results show that the water depth for hollowing village region was largest, and the maximum value of water depth increasing was about 0.57 m. Different roughness values in village region had significant impact on flood routing near village. To be specific, the water depth of n = 0.12 was 0.25m larger than that of n = 0.06, the corresponding flow velocity decreased by 0.24 m/s.