HEC-HMS模型在官山河流域的应用研究

Application of HEC-HMS model in the Guanshan River Basin

以官山河流域为研究区域,根据流域数字高程模型(digital elevation model,DEM)、土地利用、土壤类型等数据,建立HEC-HMS(the Hydrologic Engineering Center’s-hydrologic modeling system)模型。基于修正的Morris筛选法分析HEC-HMS模型参数敏感性,选取研究区域内4场雨洪资料进行模型参数率定及验证,研究结果表明:HECHMS模型主要的敏感性参数为径流曲线数(curve number,CN)、不透水面积比、流域滞时、峰值系数、衰退系数和峰值比率;4场洪水的洪峰流量误差均小于20%,洪水总量误差均小于20%,峰现时刻误差均不大于3 h,Nash效率系数均大于0.7,表明该模型在官山河流域的降雨洪水模拟上具有良好的适用性。

Taking the Guanshan River Basin as the research area,a HEC-HMS(the Hydrologic Engineering Center’s-hydrologic modeling system)model was established according to DEM(digital elevation model),land use,soil type and other data of the basin.The modified Morris screening method was used for parameter sensitivity analysis,and then the model parameters were calibrated and verified by selecting four rain storms in the basin.The results show that:the main sensitive parameters of the model are CN(curve number),impervious area ratio,lag time,peaking coefficient,recession constant and ratio to peak.The errors of peak discharge are less than 20%,the errors of total flood are less than 20%,the errors of peak time are not more than 3 h,and the Nash coefficient is more than 0.7,which shows that the model has good application in rainfall flood simulation in Guanshan River Basin.