以白花河小流域为例,探讨缺资料地区HEC-HMS模型的适用效果.通过流域DEM等下垫面数据获取流域信息,采用SCS-CN曲线法、SCS单位线法、指数衰退法、马斯京根演算法进行流域产汇流计算及河道洪水演算,构建了HEC-HMS降雨径流模型,结合广东省综合单位线法与推理公式法的结果对模型参数进行率定.结果表明,设计洪水计算结果的误差均小于20%且平均相对误差均小于10%;实测洪水模拟的洪峰流量相对误差小于10%,Nash系数为0.90.HEC-HMS模型进行径流模拟效果较好.可适用于研究区山洪预报.
Taking Baihua River Basin as study area,the applicability of HEC-HMS model in ungauged area is explored.The basin information is acquired based on the underlying surface data such as DEM,and the SCS-CN curve method,SCS unit line method,recession method and Muskingum method are used to calculate basin runoff and river flood evolution.The HEC-HMS model is constructed and the model parameters are calibrated by comparing the results of synthetic unit hydrograph of Guangdong and rational formula of Guangdong.The results show that,(a)all the errors of design flood calculation results are less than 20%,and the average relative errors are less than 10%;and(b)the relative error of measured flood peak flow is less than 10%,and the Nash coefficient is 0.90.The HEC-HMS model has a good effect on runoff simulation,and can be applied to the flash flood forecast in the study area.