摘要
径流曲线法是目前国际上预测无径流观测资料地区降水地表产流的主要模型,由于气候、水文及下垫面的差异,在黄土高原地区的应用受到限制。利用黄土高原地区3个小流域的303场降雨径流资料,针对黄土高原降雨地表径流特点优化模型中的初损率λ,并提出降雨强度修正函数,将降雨强度因子引入径流曲线法。优化后的模型效率E达到0.812,实测径流深与预测径流深的线性回归决定系数R2达到0.822。改进后的SCS-CN模型可用于黄土区小流域降雨地表产流预报,对黄土高原无资料地区侵蚀产流预报、指导水土保持工程配置和设计具有重要的理论和工程实践意义。
The Soil Conservation Service curve number （SCS-CN） method is widely used for predicting direct runoff from rainfall for the areas without observed runoff data, the application of this method in the Loess Plateau was limited because that the difference of climate, hydrology and underlying surface. Focus on the characteristic of rainfall, initial abstraction ration λ was optimized by using 303 rainfall-runoff events from 3 watersheds in the Loess Plateau. And further more, a rainfall intensity adjusting factor for rainfall was developed and incorporated into the SCS-CN method, and its model parameters were optimized with an E value of 0.812, and the R2 of regression equation between the measured and estimated values was 0.822. The results showed that the improved SCS-CN method can be used to estimate runoff in small watershed on Loess Plateau. It has important meaning for predicting direct runoff and soil erosion from rainfall for the area without observed runoff data on Loess Plateau, for guiding configuration and design of soil and water conservation engineering.
出处
《中国水土保持科学》
CSCD
2008年第6期87-91,97,共6页
Science of Soil and Water Conservation
基金
国家“973”专题“坡面土壤侵蚀发生发展过程的动力学机制”(2007CB407201)
关键词
径流曲线法
径流预测
模型优化
小流域
黄土高原
SCS-CN method
runoff prediction
model optimization
small catchment
Loess Plateau
