蓄水方案改变对三峡水库变动回水区航道的影响

Influence on the Navigation Channel of the Fluctuating Backwater Area of theThree Gorges Reservoir Caused by the Change of Operation Regulation

在分析蓄水方案变化对三峡水库枯水期保证水位回水末端的影响的基础上,计算对比了三峡蓄水方案变化前后重庆河段的淤积发展、分布及其对航道的影响,结果表明:随着水库运用初期河势调整或者炸礁措施的投入及枯期消落水位155m回水末端的上延,重庆河段是变动回水区碍航的重点区域;蓄水方案改变对重庆河段初期淤积量有一定影响,但影响不大,随着蓄水时间增长,蓄水方案调整前后河段的淤积量及淤积分布差别逐渐消失;蓄水方案调整后,淤积量逐年增长,泥沙淤积纵向分布仍然集中宽阔的浅滩段,横向分布仍然集中在汛期的回流区或边滩部位,部分浅滩随着水库运用时间的增长出现碍航问题,与蓄水方案调整前基本一致,总的来说,蓄水方案调整对重庆河段的航道影响不大。

Based on analyzing caused by the change of operation the influence on the terminal of backwater of 155 m of the Three Gorges Reservoir regulation, with the two-dimensional, unsteady flow and non-uniform sediment mathematical model, deposition development, distributing and the influence on navigation channel in Chongqing reach are compared. A conclusion is drawn that Chongqing reach will become the main foreclosing shipping area with the regulation works put in practice and the headward extension of backwater of 155 m. At forepart, a little influence on the deposition of Chongqing reach is brought by the change of regulation operation, the influence will disappear with the time increasing. The deposition area and changing the operation regulation. In a word, the change of tion channel of Chongqing reach. the main foreclosing shipping area change little after operation regulation has little influence on the navigation channel of Chongqing reach.