三峡水库变动回水区铜锣峡河段演变研究

Evolution Research of Tongluoxia River Reach in Changing Back Water Region of TGP Reservoir

三峡水库铜锣峡河段泥沙模型进行了正常蓄水位１６０ｍ，１７０ｍ，１７５ｍ及１８０ｍ方案的浑水试验；该河段分别处于各种方案的变动回水区上、中、下段位置。文中综合分析了这些试验成果，认为变动回水区内各河段悬移质泥沙淤积量的多少，主要取决于汛期壅水高度，因此优化三峡水库调度是解决变动回水区航道、港口泥沙问题的重要手段之一。建库后卵石推移质主要淤积在回水末端附近和变动回水区上段，应针对不同河段特点实施整治工程。

The muddy water model tests for various schemes corresponding to TGP's designed normal high water levels 160m, 170m, 175m, and 180m, respectively, have been conducted by using the Tongluoxia river reach sediment model. In these schemes, the Tongluoxia river reach is located at the upper, middel, or downstream stretches, respectively of the changing back water region in the TGP reservoir. The test results are synthetically analysed. It is noted that the amount of sediment from suspension load in each reach of changing back water region primarily depends on the back water level in flood season, so optimizing the TGP reservoir regulation is one of the important measures for resolving the sediment problems of the navigation pass and harbor in the changing back water region. After the dam completion, the gravel bed loads are primarily settled at the end and the upper stretch of changing back water region, and , thus, the regulation engineering must be employed in accordance with variant river reach characters.