为对比分析HEC-HMS模型三种降雨损失方法在沁河流域的适用性.借助Morris筛选法识别降雨损失方法的关键参数,选用流域内5场雨洪资料进行参数率定和模拟精度分析.结果表明:(1)SCS CN值曲线法、Green-Ampt法、Initial and Uniform法主要敏感性参数分别为CN值、土壤饱和导水率、恒定损失率.(2)选取洪峰流量、洪水总量、峰现时刻误差以及Nash系数对模型模拟精度进行评价,SCS CN值曲线法和Initial and Uniform法模拟结果达到乙等精度,Green-Ampt法模拟结果达到丙等精度.研究成果可为半湿润地区中小流域降雨损失方法的选择提供参考.
Comparative Study on Different Rainfall Loss Methods of HEC-HMS Hydrological Model
In order to assess the suitability of three rainfall loss methods in the Qinhe River Basin.This study selected five storm runoff datasets from the Feiling-Weizhai segment of the Qinhe River and employed the Morris screening method for model parameter calibration and validation.The results indicate that:(1)The sensitivity parameters for the SCS Curve Number method,Green-Ampt method,and Initial and Uniform method are CN,soil saturated hydraulic conductivity,and constant loss rate,respec-tively.(2)The accuracy of model simulations was evaluated based on peak flow,total flood volume,peak timing error,and Nash coefficient.The SCS CN method and Initial and Uniform method achieved a grade B level of accuracy in their simulations,while the Green-Ampt method achieved a grade C level of accuracy.The results could provide references for the selection of rainfall loss methods for small and medium-sized basins in the sub-humid area.
HEC-HMSflood simulationrainfall loss methodsparameter sensitivity analysisQinhe River Basin
万方数据
维普
