长江中游监利河段河床演变与航道整治思路

River bed evolution and waterway regulation thought of Jianli section in the middle reach of the Yangtze River

长江中下游分汊河道众多,碍航问题突出。以典型弯曲分汊河道监利河段为例,通过对三峡水库蓄水前后演变规律的对比分析,认为乌龟夹将作为主汊长期存在,在三峡蓄水运用以后,乌龟夹的主汊地位将会进一步加强。但乌龟夹口门处的浅区将继续存在,加之水库汛后蓄水期间水位快速退落,退水冲槽的能力大幅减弱,碍航问题将更为严峻。在总结河段浅滩碍航特性的基础上提出了保持现有分汊格局,稳定洲滩,束水冲槽,结合清除下段水下碍航物的整治方案,以期从根本上解决监利河段的碍航问题。

There are many branching reaches in the middle and lower reaches of the Yangtze River,which maintain seriously the navigation-obstruction problems.Taking the Jianli section as an example of typical curvedbranching reach,the contrasting analysis of bed evolution law before and after the impoundment of the Three Gorges reservoir is carried out.It is thought that the Wuguijia of the Jianli section＇s right branching will acts perennially as the main branching.After the impoundment of the Three Gorges reservoir,the main branching status of Wuguijia will enhance further.However,the shoal of inlet of Wuguijia will continue existing,together with the fast falling of the water level after flooding during the impoundment,the scouring ability of the falling water will be weakened greatly.The navigation-obstruction problems will get more serious.Based on the analysis of the characteristics of shoal＇s navigation-obstruction of the Jianli section,this paper presents the regulation thought of keeping the existed branching pattern,stabilizing the bar and island,contracting water and scouring pool,and clearing away the underwater navigation-obstruction barriers of the down section,so as to solve the problem of navigation-obstruction of the Jianli section basically.