直接求解P-Ⅲ型分布函数的水文频率计算  

Direct solution to hydrologic frequency of Pearson type Ⅲ distribution function

作　　者：张春[1] 苟东明 

机构地区：[1]四川华能宝兴河电力股份有限公司,四川省雅安市625000 [2]中国水电顾问集团北京勘测设计研究院,北京100024

出　　处：《西北水电》2010年第1期10-12,共3页Northwest Hydropower

摘　　要：皮尔逊Ⅲ型(P-Ⅲ型)频率曲线作为中国规定的水文频率线型,其累计频率的计算一般是借助查"P-Ⅲ型频率曲线离均系数Φ值表"进行的。介绍不使用Φ值表的水文频率计算方式:用程序直接求解P-Ⅲ型频率分布函数的水文频率计算。该计算方法可以对P-Ⅲ型频率曲线的3个统计参数进行优化计算。阐述了利用IMSL FORTRAN程序库编写该程序的要点。The Pearson type Ⅲ （P-Ⅲ） frequency curve is specified as the type of hydrologic frequency curve in China, and the cumulative frequency is calculated by means of ＂Table of Ф values of P-Ⅲ frequency curve mean deviation coefficient＂. The paper describes the method for calculation of hydrologic frequency without using the table of Ф values. It uses program to provide direct solution to the hydrologic frequency of P-Ⅲ frequency distribution function. This method can optimally calculate the 3 statistic parameters of P -Ⅲ frequency curve. The paper also presents the key points for preparing the program based on the IMSL FORTRAN library.

关 键 词：水文频率计算 P-Ⅲ型频率分布函数 IMSL FORTRAN程序库 

分 类 号：TV124[水利工程—水文学及水资源]