三峡水库2003年蓄水以来库区干流泥沙淤积初步分析

Sedimentation in Yangtze River above Three Gorges Project since 2003

基于三峡水库2003年蓄水至2010年间的实测资料,对库区干流的泥沙淤积量、淤积分布及断面淤积方式进行了详细分析。结果表明,三峡水库干流河道泥沙淤积主要发生在常年库区内,平面上呈不连续分布,其断面淤积形态主要有三种。三峡库区干流泥沙淤积分布与河道的平面形态以及断面的平均水深和平均流速等参数关系密切,本文统计分析得出了发生泥沙淤积时断面平均流速与水深间的经验关系。

Analysis based on field data of the Three Gorges Project （TGP） since 2003 shows that sedimenta- tion in the Yangtze River above the TGP mainly deposited in the permanent backwater region. However, in the permanent backwater region the sedimentation did not spread widely and continuously. Totally, there are mainly three kinds of deposition section form. Sedimentation in the Yangtze River above the TGP has a close relationship with the plan form of the channel, the average water depth and the average cross-sectional veloci- ty. The empirical relationship between the average water depth and the average velocity when sedimentation happening is obtained by statistic analysis finally.