长江下游口岸直水道鳗鱼沙浅滩深水航道整治方案初探

On channel regulation of Manyusha shallow in Kou'an straight reach of the Yangtze River

鳗鱼沙浅滩位于长江下游口岸直水道,属顺直宽浅水下分汊型沙质浅滩。顺直宽浅的河道属性使鳗鱼沙心滩和左、右两槽不稳定,年际间滩槽冲淤变化较大,甚至出现滩槽易位的现象,是长江下游深水航道主要的碍航浅滩。基于河床演变分析和模型试验相结合的方法,分析鳗鱼沙浅滩近期演变特征以及浅滩成因,确立了维持水下分汊的整治思路,提出江中实施龟背状潜格坝群的整治工程措施,并进行整治工程方案实施前后对比试验,分析研究整治工程方案实施后对航道条件的改善以及对工程河段河势可能产生的影响。

Manyusha shallow is located at the Kouan straight reach, which is an underwater braided channel. Manyusha shallow is one main navigation obstacle shallow in the Yangtze River downstream. Based on the analysis of riverbed evolution and the physical model test, we analyze the evolution characteristics of Manyusha shallow in the recent period and the navigation obstacle characterisitcs and the causes, and establish the regulation idea and regulation engineering scheme of Manyusha shallow. According to the results of the model test, we analyze the regulation effects after the implementation of the recommended project and the effects on the river regime of Yangzhong reach.