Abstract
In hilly areas of northern China, frequent mountain torrents have seriously threatened the security of people’s lives and properties. For those flood-prone hilly areas lack of hydrological data, this paper took the Tongtian river small watershed as the research area, and used HEC-GeoHMS module to preprocess the DEM of 30m*30m, then established the HEC-HMS model of the research area. By comparison and analysis of methods, this paper adopted respectively initial loss and steady seepage method, Synder unit hydrograph method, exponential attenuation method, Muskingum method to simulate the calculations of runoff yield, direct runoff, base flow and river flood routing accordingly, then chose 7 floods to calibrate parameters and 3 floods to verify them. The results showed that the occurrence time of simulated flood peak was close to that of observed flood peak, and the error of flood peak flow calculation was within 10%. The good applicability of HEC-HMS model was demonstrated with the results of the simulation, and HEC-HMS model can be applied to the calculation and analysis of rainfall-flood process in the actual small hilly watershed. This research may provide the reference for the prevention and control of mountain torrents effectively.
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