摘要
本文根据1950年以来的水文资料研究了长江宜昌站在三峡工程修建前的水沙变化趋势,预测三峡水库运用后,在2003-2012年以及2013年金沙江上建成金安桥、溪洛渡和向家坝三个大型水电站后宜昌的水沙变化趋势。根据水文资料的统计分析发现在三峡工程修建以前,宜昌年水量有轻微减小的趋势;而年沙量在1950-1987年以后有大幅度减小,至2003-2004年宜昌站(用三峡水库的入库沙量替代),减沙幅度已达到61.4%。本文根据三峡水库运行后的实测资料对长江科学院三峡水库淤积计算的水库排沙比资料进行了修正。采用1961-1970年十年系列的年水量,分析计算预测2003-2012年宜昌平均年沙量为1.02亿t。在金沙江上三个水电站建成后2013-2022年平均年沙量将减为0.534亿t。
The trend change of incoming runoff and sediment to Yichang hydrometric station is studied before impounding of Three Gorges Project（TGP）. It is predicted after impounding of TGP from 2003 to 2012 and after constructed projects of Jinanqiao, Xiluodo, Xiangjiaba（on Jinshajiang river） from 2013 to 2022. According to the hydrometric data from 1950 to 2004, it is found that the mean yearly runoff of Yichang has reduced down very little, but the mean yearly sediment runoff has reduced very much after 1950- 1987 .Till 2003 -2004,the reducing range of mean yearly sediment runoff to Yichang station（use mean sediment runoff into reservoir instead of Yichang＇ s） has reached to 61.4%. The desihing ratio which was studied by Yangtze River Research Institute in 1980＇s is modified in this paper according to the measured data after the reservoir impounding.
It is predicted by using the yearly runoff series from 1961 to 1970 that the mean yearly sediment runoff of Yichang is 1.02 × 10^8t/a from 2003 to 2012 after Three Gorges Project has built and the mean yearly sediment runoff of Yichang is 0.534 × 10^8t/a from 2013 to 2022 after the thee projects have built on Jinshajiang river.
出处
《水力发电学报》
EI
CSCD
北大核心
2006年第6期103-110,118,共9页
Journal of Hydroelectric Engineering
基金
国家自然科学基金项目(50339010)
973计划课题编号2003CB415206
国家自然科学基金面上项目(430371114)的资助
关键词
河流泥沙工程学
水沙变化趋势
水文分析
宜昌年沙量变化
三峡水库和上游水利水电工程
river sediment engineering
trend change of incoming runoff and sediment runoff
hydrologic analysis
yearly sediment runoff to Yichang
Three Gorges Reservior and the projects on Jinshajiang river
