三峡水库提前蓄水对重庆河段泥沙淤积和浅滩演变的影响  

Impact on sediment deposition and shoals change in Chongqing Reach of the impounding water ahead of the schedule of the Three Gorges Reservoir

作　　者：邓金运[1] 李义天[1] 陈建[1] 甘富万[1] 

机构地区：[1]武汉大学水资源与水电工程国家重点实验室,湖北武汉430072

出　　处：《泥沙研究》2008年第3期38-42,共5页Journal of Sediment Research

基　　金：国家973项目(编号:2003CB415203);国家自然科学基金项目(编号:05050920)资助

摘　　要：重庆河段航运地位非常重要,三峡水库提前蓄水后,泥沙淤积可能对该河段浅滩演变及航运条件产生重要影响。本文通过平面二维水沙数学模型,对提前蓄水后重庆河段的泥沙淤积及浅滩演变进行了分析。结果表明,水库运用初中期,提前蓄水后重庆河段泥沙淤积速率明显加快,但随着水库趋于平衡,提前蓄水方案与正常调度方案泥沙累积淤积总量差别不大。提前蓄水仅改变了重庆河段的泥沙淤积速率,并没有改变各浅滩河段的淤积部位。Chongqing Reach is the economic center of the upper basin of Yangtze River with an important navigation position. After the impounding water ahead of schedule of the Three Gorges Reservoir（TGR）, impact of sediment deposition on shoal evolution and navigation would be more and more concerned. In this paper, a 2-D numerical model for flow and sediment is used to study the sediment deposition and shoals change after the impounding water ahead of the schedule. It is shown that the sediment deposition rate becomes larger after the impounding water ahead of schedule of TGR in its initial and middle periods, and the longer the time ahead is, the larger the sediment deposition of Chongqing Reach will be. The amounts of accumulated sediment deposition for different cases at 100^th year are similar for the sediment deposition trends to equilibrium. The impounding water ahead of schedule of TGR only changes the sediment deposition rate of Chongqing Reach, but the sediment deposition location of different shoals is not changed.

关 键 词：提前蓄水 重庆河段 泥沙淤积 浅滩演变 

分 类 号：TV147[水利工程—水力学及河流动力学]