三峡水库蓄水后枝江—江口浅滩河段演变趋势

Analysis of river evolution tendency at Zhijiang-Jiangkou Reach after impoundment of Three Gorges Reservoir

分析了三峡水库蓄水前后砂卵石河段末端枝江—江口河段河床冲刷及枯水位变化特点,同时根据河床勘测资料探讨了河段极限冲刷状态地形,并分析预测了极限冲刷状态水流条件的变化.研究认为,本河段河床抗冲性的差异导致沿程水位降幅不一;在未来河床冲刷和水位下降过程中,局部抗冲性强的河段将可能面临水深不足和坡陡流急的碍航局面.

For the Zhijiang Jiangkou Rearch, the riverbed evolution and low-water level changes before and after the impoundment of the Three Gorges Reservoir is analyzed; and then the utmost-erosion state of riverbed is explored according to the prospect hole data. At the same time, the flow condition connected with the utmost-erosion state of riverbed is analyzed. The research indicates that the difference of riverbed scour resistances can cause the non uniform water level drop; and the navigation channel at some reach which has strong scour resistance will possibly be confronted with the problem of shortage of water depth, steep water surface slope and high flow velocity in future.