三峡水库蓄水后土脑子河段冲淤特性分析

土脑子河段在三峡水库135～139 m蓄水运用阶段位于水库变动回水区,156 m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156 m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.

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

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...