水力发电学报2023，Vol.42Issue(12)：48-60,13.DOI:10.11660/slfdxb.20231205
三峡区间年最大降雨与上游洪水遭遇风险研究
Study on coincidence risks for annual maximum rainfall in Three Gorges region and flood events in upper Yangtze River
摘要
Abstract
Rainfall events in the Three Gorges Region(TGR)of the Yangtze River tend to be concentrated on flood season.The coincidence of such rainfalls with flood events occurring in the upper reaches of the river may result in adverse impacts on the flood control of the Three Gorges reservoir.To investigate the characteristics of this coincidence,this paper calculates the joint distribution of the annual maximum rainfall in TGR and the annual maximum flood in the upper Yangtze River based on the Archimedean Copula function,and examines the risk of their coincidence from aspects of both time and magnitude(including peak value and hydrograph).The results indicate that temporal coincidence manifests a bimodal distribution with two peaks,and the annual maximum daily areal rainfall and 7-day areal rainfall in TGR generally occur earlier than the annual maximum flow and 7-day flood volume in the upper Yangtze River.The probabilities of both the flood peak coincidence and hydrograph coincidence increase with the increasing design frequency,and the coincidence that the TGR rainfall occurs earlier than the upper Yangtze River flood has a higher probability in both cases.For a given design frequency,the probability of hydrograph coincidence is greater than that of flood peak coincidence.This study would help the flood control scheduling of the Three Gorges reservoir.关键词
降雨和洪水/三峡区间/长江上游/阿基米德Copula函数/遭遇风险Key words
rainfall and flood/Three Gorges region/upper Yangtze River/Archimedean Copula function/coincidence risk分类
建筑与水利引用本文复制引用
姚礼双,彭杨,廉博勋,罗诗琦,张志鸿..三峡区间年最大降雨与上游洪水遭遇风险研究[J].水力发电学报,2023,42(12):48-60,13.基金项目
国家自然科学基金项目(51679088) （51679088）
