关于长江口近期河床演变的若干问题

Some issues of river channel evolution of the Yangtze estuary in recent period

长江水利委员会科学技术委员会组织的长江口河道查勘和综合治理调研活动。根据调查的情况,结合以往收集的资料,概要分析了长江口徐六泾节点附近、扁担沙束窄段、南北港分流口、南港与北港、南槽与北槽、横沙通道以及北支近期河床冲淤变化,认为稳定南北港分流是长江口整治的关键,提出徐六泾与扁担沙节点控制作用和各汊中滩与槽相互关系方面存在的问题,对长江口河床演变的某些趋势阐述了作者的初步看法。

The Technology Commission of Changjiang Water Resources Commission organized river channel reconnaissance and comprehensive investigation on the harnessing of the Yangtze estuary.Based on investigation,some issues on scouring and silting variation in the nearby of Xuliujing node,the constraint reach at Biandan sha shoal,diversion outlet at Nangang branch and Beigang branch,Nancao cannel and Beicao channel,Hengsha pass-channel and north Yangtze river branch in the estuary of the Yangtze river is briefly analyzed.It is considered that the diversion at Nangang channel and Beigang channel is the key of the Yangtze estuary harnessing and the control roles of Xuliujing node and Biandansha node and the correlation of the shoals and channel of the branches are pointed out.The variation tendency of river channel evolution at the Yangtze estuary is analyzed.