An Approach to Determine Critical Precipitation of Mountain Torrential Flood Disaster in Ungauged Basins
Critical precipitation is an important indicator during the process of preventing flash flood disasters. However, how to determine the value especially in ungauged basins is always challenging. Because the parameters of hydrological models used to calculate the critical precip-itation cannot be calibrated. When we derive design storm and its corresponding design flood, the rainstorm isograph method is widely used in ungauged basins in engineering practice. Therefore, the design storm and its corresponding design flood are employed to calibrate the hydro-logical model parameters in our study, and the critical precipitation was determined when the disaster flow is input into the model. With a case study of Dianjun District, Yichang City, Hubei Province, Xin'anjiang and SCS model are selected to assess critical precipitation respec-tively. The results indicate that the proposed method is conducive to determining the critical precipitation in ungauged basins. Both selected hydrological models are feasible to calculate the critical precipitation, but the Xin'anjiang model has better performance than the SCS model in our case study.
critical precipitationflash flood disastersXin'anjiang modelSCS model
NETL
NSTL
万方数据
维普
