流量过程线分割的新方法——公式推导

A New Method for Base Flow Hydrograph Separation-Formula Derivation

针对现行流量过程线分割方法中存在着缺乏物理基础和客观的、科学的操作方法,以及其他的一些问题,提出了流量过程线的分割应遵循的三条基本原则,在此基础上提出流量过程线分割的新方法。该法通过流域的降雨资料和出口断面的流量资料,经推导得到Horton下渗能力曲线的三参数,并推导出地下净雨量在非饱和带运行时间公式和地下水汇流公式,从而对流域出口断面流量过程线进行分割。

In order to overcome the weaknesses in the traditional methods for base flow separation, such as the lack of both physical basis and feasible proeedures, three basic principles for base flow hydrograph separation were proposed,based on which a new base flow hye]rograph separation method was developed. In this new method,the mathematical expressions of three parameters for Horton infiltration capacity curve were derived in terms of rainfall and runoff data, and the lag time of the effective rainfall in unsaturated zone and the groundwater flow routing equation were also presented. With these equations,the surface runoff and base flow hydrographs at the outlet of the basin can be scientifically separated.