泥沙研究2025，Vol.50Issue(4)：1-8,8.DOI:10.16239/j.cnki.0468-155x.2025.04.001
向家坝水电站下游河道冲淤演变规律
Study on the channel evolution downstream of the Xiangjiaba Hydropower Station
摘要
Abstract
Based on observed data from 2008 to 2023,the channel evolution of erosion and deposition downstream of the Xiangjiaba Hydropower Station was systematically analyzed,and the estimate extreme scour depth near the dam during high flow events was simulated.The results show that the downstream channel remains relatively stable with erosion and deposition in general balance under natural conditions.However,the significant scouring has been observed within 4.0 km downstream of the dam during the construction period,where the deep thalweg line undercut by an average of approximately 5.0 m,while changes beyond 4.0 km are minor.Since the operation of the hydropower station,an average thalweg undercut of 0.33 m has occurred in the entire study area of 32.0 km in length,the undercut in the reach 13.0 to 16.0 km downstream of the dam is about 5.0 m,which is mainly caused by the sand mining.Between 2012 and 2023,totaled cumulative erosion is 11.03 million m3,of which 9.17 million m3 resulted from artificial sand mining and only 1.86 million m3 from natural erosion.Numerical simulations show that under a high flow discharge of 20 000 m3/s,the extreme scour depths can reach to 3.63 m at 2.1 km and 2.21 m at 6.0 km downstream of the dam,suggesting that significant scouring may still occur when the strong flood occurs.关键词
向家坝水电站/冲淤演变规律/人工采砂/极限冲刷深度/粗化层级配Key words
Xiangjiaba Hydropower Station/erosion and deposition/sand mining/extreme scour depth/size distribution in armoring river bed分类
建筑与水利引用本文复制引用
冯志毅,邓安军,陆琴,冯胜航,吕瑞茹..向家坝水电站下游河道冲淤演变规律[J].泥沙研究,2025,50(4):1-8,8.基金项目
国家自然科学基金项目(U2040217,U2340223) （U2040217,U2340223）
