水资源与水工程学报2025，Vol.36Issue(6)：86-94,112,10.DOI:10.11705/j.issn.1672-643X.2025.06.11
三峡水库建成前后长江中下游枯期径流演进特征的对比研究
Comparison of evolution characteristics of dry season runoff in the middle and lower Yangtze River before and after the impoundment of the Three Gorges Reservoir
摘要
Abstract
With the frequent occurrence of drought events,the hydrological situation of the Yangtze River has changed over time.After the impoundment of the Three Gorges Reservoir and other reservoirs,the regulation and operation has further changed the evolution law of runoff in the middle and lower reaches of the Yangtze River,especially in the dry season.Yet,the propagation duration,smoothing and probabili-ty distribution characteristics of runoff evolution in this part of the river in dry season have not been dis-cussed in depth.In view of this,we analyzed and compared these characteristics before and after the im-poundment of the Three Gorges Reservoir based on the hourly measured water level and runoff data of long series from hydrological stations in Yichang to Datong section,using methods of peak-valley identifica-tion,fluctuation coefficient and probability distribution index.The results show that in terms of propaga-tion duration,the average propagation duration of dry season runoff in the upper reaches of Luoshan Hydrological Station was generally shortened by 2-5 hours after the impoundment;whereas the lower reaches remained unchanged.In terms of the smoothing degree,the river sections from Yichang to Jianli station were enhanced after the impoundment(the increase coefficient decreased by 0.02-0.15),but the river sections from Jianli to Hankou station were weakened(the increase coefficient increased by 0.02-0.03).In terms of probability distribution characteristics,the evolution trend of dry season runoff remained stable,but the total runoff increased,the distribution tended to be concentrated,the positive bias was enhanced,and the randomness was weakened.The research results can provide a technical sup-port for fine water replenishment scheduling,ecological scheduling and salt tide control scheduling in the middle and lower reaches of the Yangtze River.关键词
径流演进/枯期/传播历时/坦化程度/概率分布特征/三峡水库Key words
runoff evolution/dry season/propagation duration/smoothing degree/probability distribu-tion characteristics/the Three Gorges Reservoir分类
建筑与水利引用本文复制引用
王现勋,朱怡然,孔振宇,徐雨妮,刘鑫,许银山..三峡水库建成前后长江中下游枯期径流演进特征的对比研究[J].水资源与水工程学报,2025,36(6):86-94,112,10.基金项目
国家自然科学基金项目(U2340213) （U2340213）
国家重点研发计划课题(2023YFC3206003) （2023YFC3206003）
