水文频率计算中对数Γ分布的应用

Application of log Γ Distribution in Hydrologic Frequency Computation

简述了对数Γ分布的统计特性和不同CS／CV值时模比系数Kp的制作方法。介绍了估计参数的矩法、混合矩法和适线法。文中认为，可以用水文资料的原系列直接进行频率计算，以避免对数变换引起的误差；并且，可将该型分布作为比较线型，用于进一步的分析研究中。

 The statistical characteristics of log Γ distribution and the estimation method of modulus coefficient Kp for different CS／CV are briefly described． The momentmixed moment and curve－fit methods for estimating its parameter values are introduced． It is thought that the frequency analysis and estimation can be carried out directly by the original hydrologic series to avoid errors produced by the logarithm transformation and this type of distribution could be used to further analyze and investigate hydrologic frequencies as an alternative procedure．