浅析基于Cs和Ck相对关系的分布函数初步选型  

Preliminary selection of distribution function based on the relative relationship between C_(s) and C_(k)

作　　者：倪世纬 罗兰 饶品隆 NI Shiwei;LUO Lan;RAO Pinlong(Wannian County Water Conservancy Bureau,Wannian 335500,China)

机构地区：[1]万年县水利局,江西万年335500

出　　处：《水资源开发与管理》2021年第4期20-24,共5页Water Resources Development and Management

摘　　要：利用理论分布函数分析水文要素分布规律是水利工程中常用的方法,但在使用过程中如何选择一种合理的理论分布函数是难点所在。本文以万年县境内荷塘水文站多年径流量参数为统计样本,通过对比样本与4种常见分布函数的偏态系数C s和峰度系数C k的相对关系,找到适合样本的理论分布函数,并通过比较4种不同分布函数对样本的拟合结果,进一步验证了该方法的适用性。本文方法可为类似水文参数的理论分布函数选取提供参考。Using theoretical distribution function to analyze the distribution law of hydrological elements is a common method in water conservancy projects,but how to choose a reasonable theoretical distribution function is the difficulty.In this paper,Hetang Hydrological Station in Wannian County multi-year runoff parameter is taken as a statistical sample,and the theoretical distribution function suitable for the sample is found by comparing the relative relationship between the sample and the skewness coefficient C s and kurtosis coefficient C k of four common distribution functions.The applicability of this method is further verified by comparing the fitting results of four different distribution functions to samples.The method in this paper can provide reference for the selection of theoretical distribution function of similar hydrological parameters.

关 键 词：分布函数 径流量 偏态系数 峰度系数 

分 类 号：TV121[水利工程—水文学及水资源]