长江下游安庆水道河床演变和航道整治思路

Riverbed evolution and waterway regulation ideas of Anqing Waterway in the lower Yangtze River

文章对安庆水道在三峡工程蓄水前后的演变规律进行了分析,表明自然条件下洲滩周期性变化,河道汊道条件变化较为剧烈,航道条件时好时差,稳定性较差。三峡蓄水后,安庆河段演变规律保持不变,在新洲向右淤长的发展趋势下,左汊进口航道条件向不利方向发展。在河势控制工程实施后,一定程度上改变了新中汊边界条件,河道的周期性演变有所趋缓,有利于维持当前的三汊格局。在总结河段碍航特性的基础上,提出了限制新中汊发展,调整分流、稳定洲滩和束水冲槽的整治思路,以期解决安庆河段的碍航问题。

A comparative analysis of riverbed evolution before and after the impoundment of TGP was carried out in this paper. The results show that the sand beach and bank in Anqing Waterway have a characteristic of periodic changes under natural conditions, and the riverbed and navigation conditions of branches change rapidly. After the impoundment of TGP,the evolution rules remain unchanged,and the navigation condition of the entrance region of left branch will expand towards adverse direction under the tendency of development of Xinzhou sandbar to the right. After the implementation of the river pattern control project,the boundary condition of the new middle branch is changed,and the periodic evolution process becomes slower,which is beneficial to maintaining the current branches pattern. On the basis of summarizing the characteristic of navigation obstruction of Anqing reach,the regulation ideas of limiting the middle branch development,adjusting distributary of branches,stabilizing river beach and scouring the channel by flow contraction for Anqing Waterway were presented in this paper.