In order to accurately and effectively forecast the rainstorm flood in the Chengkou section of the Renhe Riv-er Basin,based on DEM,land use and soil type data,a 3-level channel model of the Renhe River Basin was constructed u-sing the Liuxi River model.The parameters of the 20190627 rainstorm flood were manually optimized.With the help of 20170923 and 20180919 rainstorm floods,the applicability of the model was verified.Considering the direction of rainfall movement,the optimized model was used to simulate the flood flow of five scenarios with 12-hour rainfall of 30,60,90,120,and 150 mm,and the simulation characteristics of each scenario were analyzed.The results show that after optimi-zing the parameters,the peak error of the 20190627 storm flood is reduced to 2.79%,the peak time is 5 hours earlier,and the simulation effect of the model is significantly improved.The peak error of the 20170923 and 20180919 storm floods is less than 20%,and the peak error is less than 3 hours,meeting the simulation accuracy requirements.The Li-uxihe model can be used for storm flood simulation in the study area.Under multiple scenarios,the flood peak discharge of 30 and 60 mm rainfall is less than 150 m3/s;Starting from 90 mm rainfall,the flood peak discharge increases sharply,with a growth rate as high as 94.17%;When the rainfall moves from upstream to downstream,the flood curve has at least one peak;On the contrary,the flood curve has only one peak,and the peak time will be advanced by 1 hour for ev-ery 30 mm increase in rainfall.The Liuxi River model has good applicability in the Renhe River Basin,and the multi-sce-nario simulation results can provide multi-perspective support for the storm flood prevention and control measures in Chengkou county.
关键词
暴雨洪水/流溪河模型/任河流域/多情景模拟/城口县
Key words
storm flood/Liuxi river model/Renhe river basin/multi-scenario simulation/Chengkou county
维普
万方数据