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长江来水来沙具有水量沙量大,有明显的季节变化。水量与沙量时而相应时而不相应、流量最大月后的沙量比流量最大月前大等特点.口门附近的悬沙浓度和净输沙量在时间上有明显的涨落潮、大小潮和洪枯季变化。在空间上,三条汉道各异,同一汊道拦门沙内外也有较大差异。北港是目前长江输水输沙的主要通道。流域来沙约有50％以上在南支口门附近沉积,南港口外的水下三角洲是主要淤积区。122°30′E～123°E间是悬沙向东扩散的一条重要界线,入海泥沙主要向东偏南方向扩散。
The water coming and going to the Yangtze River has a large amount of sand in the water, with obvious seasonal changes. The amount of water and sediment sometimes and sometimes not corresponding to the maximum flow month after the sand than the largest flow characteristics of the month before the mouth of suspended sediment concentration and net sediment discharge in time there is a clear ups and downs tide, And flood season changes. In space, there are also many differences between the three Han dynasties. North Harbor is the main channel for water transport and sediment transport in the Yangtze River. More than 50% of the sediment in the basin has been deposited near the South Branch Gate, and the sub-delta outside the South Port is the major sedimentation area. 122 ° 30’E ~ 123 ° E is an important boundary of the sediment to the east, the sediment into the sea mainly to the east south of the proliferation.