长江口河段近期演变特点与整治研究建议

Recent evolution characteristics and regulation research suggestions of Yangtze Estuary

长江口河段历史上大规模的并岸并洲形成了目前两岸和崇明岛分隔南、北支的宏观边界,同时进一步塑造了近河口段宽窄相间的江心洲分汊河型和河口段"三级分汊、四口入海"的喇叭型河口。阐述了长江口近河口段和河口段2种不同的河型与河床地貌概况,分析了长江口河段近期演变特点和存在的问题,在此基础上提出了应加强河道观测与分析研究工作,尽早实施九龙港节点整治工程,深入研究南港河势控制关系等整治研究建议。

Historically, large - scale shore and continent combination in the Yangtze River estuary formed Chongming Island which separates the Yangtze River into the North and South Branches. Further, the river channel developed as alternation of wide and narrow river reaches separated by middle bars and trumpet estuary with 3 bifurcations and 4 passages to the sea. We present 2 different river types and riverbed forms at near river mouth reach and river mouth reaches respectively, analyze the evolution characteristics and the existing problems of the Yangtze River estuary in recent periods, and on the basis, the suggestions on the regulation and research are put forward ： strengthening river channel observation and analysis work, completing the harnessing work of Jiulonggang node as early as possible, carrying out in - depth research on the river regime control of Nangang Waterway.