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Application of a new 1D-2D numerical model coupling strategy to flood simulation in flood storage-detention areas
Time: 2018-08-15 | Hits:

YU Haijun 1, 2, WU Junfeng 3, WU binbin 1, 2, SUN Hongtu, MA Jianming 1, 2, GAO Jia 3, 4

1. China Institute of Water Resources and Hydropower Research, Beijing 100038, China;
2. Research Center on Flood and Drought Disaster Reduction of the Ministry of Water Resources, Beijing 100038, China;
3. The Second Design and Research Institute of Water Conserancy and Hydropower of Hebei Province, Shijiazhuang 050021, China;
4. Hebei Province Office of Flood Control and Drought Relief Headquarters, Shijiazhuang 050011, China

Abstract: A 1D-2D coupled hydrodynamic model is often necessary in numerical simulations of large flood storage-detention areas because of the existence of rivers. Aiming at the problem of low computational efficiency of traditional coupling method, a coupling strategy that the rivers are generalized on the two-dimensional cell edges is proposed and applied in the Daluze and Ningjinbo, a typical flood storage-detention area in Haihe River Basin. The influence of the infiltration on the flood routing is also analyzed based on the calibrated model. The results show that the infiltration will significantly reduce the peak water level and flooding time, and the successful application of the model shows that the present coupling strategy can effectively calculate the flow interaction between river and ground, thus having a good potential for popularization.

Keywords: numerical model; coupling method; flood simulation; flood storage-detention district; infiltration

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