人民黄河2024，Vol.46Issue(4)：37-42,6.DOI:10.3969/j.issn.1000-1379.2024.04.006
大型水库运用对河口尾闾河道出汊的影响研究
Study on the Influence of Large-Scale Reservoir Operation on Channel Avulsion of the Tail Reach of Estuaries
摘要
Abstract
In order to quantitatively study the effects of the Xiaolangdi Reservoir on the channel avulsion of the tail reach of the Yellow River estuary,a method for determining the avulsion threshold was proposed based on the improved entropy weight method.According to the meas-ured flow-sediment data,the avulsion threshold index calculation equation and the corresponding channel avulsion threshold in the tail reach of the Yellow River estuary were determined,on the basis of restoring the adjustment process of flow and sediment and the channel morpholo-gy when there was no Xiaolangdi Reservoir,and combined with the avulsion threshold,the difference in the probability of the channel avul-sion in the tail reach of the Yellow River estuary with and without the Xiaolangdi Reservoir was compared and analyzed.The results show that the river facies coefficient and fluvial erosion intensity are the two dominant indicators in the boundary and flow-sediment conditions respec-tively.Based on the measured data,the avulsion threshold index calculation equation established by these two dominant indicators,and the avulsion threshold of the tail reach of the Yellow River estuary is obtained as 38.16,that is,when the avulsion threshold index is greater than 38.16,the channel avulsion occurs in the tail reach.The application of the Xiaolangdi Reservoir restricts the amount of sediment entering into the tail reach of the Yellow River estuary,and the probability of the channel avulsion is significantly reduced.关键词
河道出汊阈值/水沙条件/河床调整/黄河口尾闾段/小浪底水库Key words
channel avulsion threshold/flow and sediment regime/channel adjustments/tail channel of the Yellow River estuary/Xiaolangdi Reservoir分类
建筑与水利引用本文复制引用
杨卓媛,夏军强,宋红波,刘国强..大型水库运用对河口尾闾河道出汊的影响研究[J].人民黄河,2024,46(4):37-42,6.基金项目
国家重点研发计划项目(2021YFC3200202) （2021YFC3200202）
