基于霍顿下渗能力曲线的流域产流计算研究

Calculation of basin runoff yield based on Horton infiltration capacity curve

以霍顿下渗能力曲线为基础,根据产流机理,对影响流域产流的降雨强度、土壤含水量、下垫面性质等重要因子进行分析,推导出土壤含水量与土壤下渗能力和地下径流入渗率的曲线方程,进而推导出了一种以流域最大蓄水量、稳定下渗率、初始下渗率3个参数为基础的流域产流计算方法。用算例对该算法进行了检验。结果表明,此方法具有一定的物理基础,符合产流基本规律,计算精度高,可为流域产流计算提供一种新的思路。

On the basis of Horton infiltration capacity curve and runoff producing mechanism and the analysis of vital factors af-fecting runoff yield such as rainfall intensity, soil moisture, underlying surface etc. , the relation equations of soil water storage with soil infiltration capacity and soil water storage with groundwater runoff infiltration rate are derived;furthermore, a simple and accuracy method of basin runoff yield calculation with three parameters of maximum basin storage capacity, steady infiltration rate and initial infiltration rate is suggested. The verification of formula with practical data shows that the method is in accordance with runoff yielding law due to its physical foundation and calculation accuracy is high, which can provide a new approach for calculat-ing the runoff yield.