HEC-HMS水文模型不同降雨损失方法对比研究

Comparative Study on Different Rainfall Loss Methods of HEC-HMS Hydrological Model

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。

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,respectively.(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.