Г型地貌瞬时单位线探讨

本文首先利用陕北岔巴沟流域地貌资料对 Horton 形态定量律进行了分析检验。在形态定量律基础上提出了雨滴沿“路径”的等待时间密度函数成Γ(Gamma)型分布的地貌瞬时单位线。此单位线有两个参数α、β,其中α可由优选法定,β由地貌参数定。Γ型地貌单位线在形式上与 Nash 单位线一致,但随流域和降雨而变化,是一个时变单位线。经三川口与蛇家沟两流域十场暴雨洪水检验结果较为满意。

A Study on Geomorphologic Instantaneous Unit Hydrograph with Gamma Type Probability Density Function

This paper proposed a geomorphologic instantaneous unit hydrograph(iuh)with gamma type probability density function(pdf).There are two parameters in the iuh,one can be determined by optimization,the other by geomorphologic parameters.The iuh changes with basins and storms.Using this iuh,the predicted outflows are very good with the observed ones in Cha Ba Gully Basin of Shaanxi Province.