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长江口属缓混合陆海相潮汐河口,口内为江心沙多岛型河道。长江口径流量大,潮流强,在两股强劲动力的相互作用下,涨落潮流路分离,在河中形成沙岛,构成长江口有规律的分汊。自徐六泾以下平面呈喇叭型,徐六泾江面宽度5.8km,苏北启东嘴与上海南汇嘴之间江面宽达90km,崇明岛将长江口分为南、北二支;长兴岛和横沙岛又将南支分为南北二港;九段沙将南港分为南、北二槽,长江口呈三级分汊,四口入海之势。在如此复杂的河势中又存在着许多相同形态和规律的河段,在长江口江苏海门头兴港至三和港河段、
The Yangtze River estuary slowly mixed land and sea tidal estuary, the mouth of the River Sands multi-channel. Under the interaction of the two strong motives, the fluctuation tidal current is separated and the sand island is formed in the river, forming a regular subdivision of the Yangtze Estuary. Since the plane below Xu Liujing is trumpet-shaped, the width of Xu River is 5.8km, the width of the river between Qidongzui of Jiangsu Province and Nanhui mouth of Shanghai is 90km. Chongming Island divides the Yangtze River estuary into south and north two. Changxing Island and Hengsha Island and the South Branch is divided into two northern and southern Hong Kong; Jiuduansha South Port will be divided into South and North two troughs, the Yangtze River Estuary was divided into three levels, four into the sea potential. In such a complex river there are many similar forms and laws of the river, in the Yangtze Estuary head Haixing Haixin to Sanhe Port section,