安徽省芜湖长江大桥下游河道演变及治理对策

Downstream river channel evolution of Wuhu Yangtze River Bridge in Anhui Province and control measures

安徽省芜湖长江大桥建成运行20 a来,受建桥及上中游水库运用后水沙条件变化等多重因素影响,桥位下游局部河势调整变化频繁,对河势稳定、两岸港口运行及航道稳定带来不利影响。对工程河段水下地形等资料进行了河势演变分析。结果表明:芜湖长江大桥建成后,该河段演变主要表现为陈家洲、曹姑洲及其前沿浅洲等洲滩冲淤摆动以及洲滩间串沟随之交替变化,陈家洲、曹姑洲等洲滩不稳、汊道冲淤反复演变。建议尽早实施曹姑洲分汊段整治工程和大拐护岸加固工程,稳定芜湖河段下段河势及陈家洲汊道分流格局。

Wuhu Yangtze River Bridge in Anhui Province has been built and operated for 20 years.Due to the influ⁃ence of multiple factors,such as the change of flow and sediment conditions after the construction of the bridge and the operation of the reservoir in the upper and middle reaches of Yangtze river,the local river regime in the down⁃stream of the bridge adjusts and changes frequently,which brings adverse effects to the stability of the river regime,the operation of the ports on both sides and the stability of the waterway.The evolution of river regime was analyzed based on the underwater topography and other data of the project reach.The results showed that after the completion of Wuhu Yangtze River Bridge,the evolution of the reach was mainly characterized as the erosion-deposition and swing of the middle bars of Chenjiazhou,Caoguzhou as well as Qianzhou at front of 2 bars;the alternative changes of channels between bars.The Chenjiazhou,Caoguzhou and etc.were unstable with the repeated erosion and deposi⁃tion of the in-between channels.It is suggested that Caoguzhou branch regulation project and the Daguai bank pro⁃tection reinforcement project should be carried out as soon as possible to stabilize the river regime of the down⁃stream part of Wuhu reach and the distributary pattern of Chenjiazhou branch.