水科学进展2015，Vol.26Issue(5)：676-685,10.DOI:10.14042/j.cnki.32.1309.2015.05.009
三峡水库运行初期的泥沙淤积特点
Sedimentation characteristics in the Three Gorges Reservoir during the initial operation stage
摘要
Abstract
The sedimentation characteristics in the Three Gorges Reservoir ( TGR) are studied by analyzing measured sediment load and cross section data. Results indicate that the total deposition amount and effective sediment export ra-tio from 2003 to 2013 are 1. 531 billion tons and 24. 5%, respectively, and both are less than those estimated during design. The sediment is primarily deposited in the wide and curved reaches in the permanent backwater region. It dis-tributes evenly over the cross sections in the wide reaches and on the side of the sections with low velocity in the curved reaches. No deposition occurs in gorges. The deposition rates near the dam tend to decrease, while those of the upper reaches are increasing. The longitudinal particle size variation is not obvious, and the median particle diameters of the deposition in the permanent backwater region are mostly less than 0. 01 mm. The thalweg of the gorge reaches have no changes, and the deposition delta is not found. The deposition in the backwater zone and the associated in-creasing of the tail water level are less than previous estimations. These suggest that the gorge reaches play a role of a local erosion base level due to their sufficient sediment carrying capacities, and it is unlikely that a unified equilibrium bed slope will be developed in the TGR.关键词
泥沙/淤积/挟沙力/平衡比降/三峡水库Key words
sediment/deposition/sediment carrying capacity/equilibrium bed slope/Three Gorges Reservoir分类
建筑与水利引用本文复制引用
李文杰,杨胜发,付旭辉,肖毅..三峡水库运行初期的泥沙淤积特点[J].水科学进展,2015,26(5):676-685,10.基金项目
国家自然科学基金资助项目( 51209241) （ 51209241）
交通运输部应用基础研究项目( 2014329814310)The study is financially supported by the National Natural Science Foundation of China ( No. 51209241) and the Basic Research Project of China Ministry of Transport ( No. 2014329814310) . （ 2014329814310）
