Study on the Influence of Topographic Data Accuracy on Watershed Flood Simulation
Taking Liulin watershed in Xingtai City,Hebei Province as the research area,this paper processed DEM data with 30 m,90 m and 1 km accuracy through HEC-GeoHMS module,and constructed the corresponding HEC-HMS model,simulated 19 floods selected in Liulin watershed,then compared and analyzed the impacts of different terrain accuracy on flood simulation,so as to explore the applicability of different resolution models in Liulin watershed flood simulation.According to the research re-sults,the qualified rates of peak flood volume of 30 m,90 m and 1km precision models are 68.4％,42.1％and 26.3％respec-tively;The qualified rates of runoff are 78.9％,68.4％and 68.4％respectively;The mean values of Nash efficiency coefficient are 0.59,0.57 and 0.46.The 30 m precision model is more suitable for flood simulation in Liulin basin.
万方数据
维普
