基于HEC-HMS模型的不同雨型下泥石流清水流量特征探讨

DISCUSSION ON CLEAN WATER FLOW CHARACTERISTICS OF DEBRIS FLOW UNDER DIFFERENT RAINFALL TYPES BASED ON HEC-HMS

基于HEC-HMS模型,选择SCS及Kinematic wave理论为基础构建了曾达沟泥石流的流域模型,并设置不同类型的12种降雨模型进行了流量计算以探讨不同降雨类型下泥石流清水流量的特征。结果显示泥石流沟口清水流量同降雨峰值到来时间、降雨集中程度(降雨模型幂次数)分别线性正相关;流量峰值延时(沟口峰值流量到来时间相较峰值雨强时间的延后值)同降雨峰值到来时间、降雨集中程度分别呈二次相关,相关关系主要为负相关,但随着第三变量的增加,相关关系不再单调;对前后两组各3个变量进行了二元多次方程拟合,拟合效果良好;将计算结果同生产中常用的推理公式法的计算结果进行对比,并分析了两者的区别及优缺点。

This study builds the basin model of Zengda gully using SCS method and Kinematic wave method in HEC-HMS.Then it calculates the clear water flow of basin model under 12 different types of rainfall and discusses the flow characteristics under different rainfall types. The results show that the peak flow rate is linear positive correlation with the arrival time of the peak of rainfall and the concentration degree of rainfall （the power number of rainfall model） .The delay time of peak flow is twice correlation with the arrival time of the peak of rainfall and the concentration degree of rainfall. The two elements multiple equation fitting for the two groups of variables and the fitting effect is good. By comparing the calculated results of HEC-HMS with the results of the inference formula method, the differences between the two results and their advantages of each method are evaluated.