中国防汛抗旱2025，Vol.35Issue(3)：35-38,85,5.DOI:10.16867/j.issn.1673-9264.2024237
基于伽马函数的洪水频率适线方法研究
Research on flood frequency fitness line method based on Gamma Function
摘要
Abstract
In engineering planning and design,the P-Ⅲcurve is usually used to calculate the design flood.However,in recent years,global climate change has led to frequent record breaking of flood peak flows,so from the perspective of engineering safety,it is necessary to adjust the frequency curve so that it is more inclined to the high-value region.In the usual method,this adjustment is realized by changing the ratio of Cv/Cs.However,this method leads to distortion and deformation of the curve,thus deviating from the ideal shape.Based on this,a new method is proposed:based on the gamma function,the high-valued region is appropriately encrypted and the inverse function of the gamma function is utilized for automatic curve fitting.This method not only maintains the reasonable shape of the P-Ⅲcurve and ensures a better fit of the curve to the frequency points,but also realizes the offset of the P-Ⅲcurve to the historical high-value area,thus reflecting the flood risk more accurately.In addition,this method significantly improves the working efficiency and calculation accuracy,providing a more scientific and accurate basis for flood calculation for engineering design.关键词
设计洪水/洪水频率/伽马函数/频率曲线Key words
design flood/flood frequency/Gamma Function/frequency curve分类
天文与地球科学引用本文复制引用
刘媛媛,刘正风,刘业森,李匡,刘舒..基于伽马函数的洪水频率适线方法研究[J].中国防汛抗旱,2025,35(3):35-38,85,5.基金项目
中国水利水电科学研究院揭榜挂帅类项目(减JZ0145B042024) （减JZ0145B042024）
水利青年拔尖人才项目(JHQB202221). （JHQB202221）
