三峡水库蓄水后土脑子河段冲淤特性分析  

Analysis of scouring and deposition characteristics of Tunaozi reach after impoundment of the Three Gorges Reservoir

作　　者：魏丽[1] 卢金友[1] 金中武[1] 

机构地区：[1]长江科学院河流所,湖北武汉430010

出　　处：《水运工程》2010年第4期100-103,108,共5页Port & Waterway Engineering

基　　金："十一五"国家科技支撑项目(2006BAB05B02);长江水利委员会长江科学院中央级公益科研院所基金(YWF0711/HL04)

摘　　要：土脑子河段在三峡水库135～139m蓄水运用阶段位于水库变动回水区,156m水位蓄水期间处于水库常年回水区。三峡水库蓄水前土脑子河段年际间冲淤平衡。根据蓄水后原型观测资料结合土脑子河段来水来沙情况及边界条件,分析了该河段的冲淤变化、深泓线、典型断面等变化规律,结果表明三峡水库蓄水后,土脑子河段洲滩岸线无明显的变化,右岸深槽发生周期性冲淤,呈现累积性淤积的趋势。2007年三峡水库156m蓄水后土脑子河段全年持续淤积,河段逐渐由偏"V"型断面向"U"型断面转变。Tunaozi reach is located at the variable backwater zone of the Three Gorges when water stage of the Three Gorges Reservoir fluctuates from 135 m to 139 m,whereas it is located at the perennial backwater zone when the water level of Three Gorges is 156 m.The degradation and aggregation of sediments had been keeping a balance in the reach before the water storage of the Three Gorges Reservoir.According to the prototype field data,the conditions of incoming sediments and flow,as well as the boundary conditions,we analyzed the changing laws on degradation and aggregation of sediments,thalweg,and typical cross-section.The result shows that there are no significant changes in the beach and periodic scouring and silting occur in the deep trough with a cumulative aggregation tendency when the Three Gorges is operated at the level of 156 m,which induces the biased ＂V＂ cross-section transforming into ＂U＂ cross-section from Year 2007 because of the continuous sedimentation.

关 键 词：三峡水库 土脑子河段 累积淤积 

分 类 号：TV146.1[水利工程—水力学及河流动力学]