摘要
三峡水库于2003年6月1日开始蓄水，开始发挥防洪、发电、航运等综合效益。根据水文泥沙观测资料，对三峡水库进出库水沙特性进行了较为系统的分析。结果表明，1991～2005年与1990年前相比，长江上游水量变化不大，但输沙量减少明显，长江寸滩站和嘉陵江北碚站年均输沙量减少约32％和75％；与多年均值相比，2003～2005年三峡水库入库沙量减少43％～63％，三峡库区淤积泥沙3．77亿t，水库排沙比为40％；受三峡水库拦沙作用影响，坝下游输沙量减少幅度较大，含沙量明显变小，悬沙颗粒有所变粗。
Since impoundment of Three Gorges reservoir on June 1,2003,TGP began to play comprehensive benefit in flood control,power generation,navigation etc.According to hydrologic and sediment observation data,the flow and sediment features flowing into and out of Three Gorges reservoir are analyzed systematically.The analysis results demonstrate that comparing with that before 1990,the water volume in upstream of the Yangtze river had less variation during the period of 1991-2005,but sediment yield decreased obviously.The annual sediment yield at Cuntan hydrologic station on the Yangtze river and Beipei station on the Jialing river decreased about 32% and 75% respectively.Comparing with mean annual amount,the sediment into Three Gorges reservoir during the period 2003-2005 decreased by 43%～63%,the sedimentation in Three Gorges reservoir was 377 million t,sediment discharge ratio is 40%.Influenced by sediment retaining of Three Gorges reservoir,the sediment yield in the dam downstream decreased largely,sediment content became smaller obviously and granular size of suspended sediment became more coarser.
出处
《人民长江》
北大核心
2006年第8期1-3,6,共4页
Yangtze River
基金
国家"973"资助项目(2003CB415205)
关键词
径流量
输沙量
水沙特性
三峡水库
flow and sediment feature
run off
sediment yield
Three Gorges reservoir
