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在前人研究及大量长时间、连续、大范围河床底质现场采样资料的基础上,对长江口南港北槽河床底质时空分布特征进行了初步分析,并从河床底质的角度对长江口深水航道回淤物质来源进行了初步的探讨。研究表明:长江口河床质具有总体较细、上粗下细以及时空分布不均匀等特点;南港北槽河床质的变化与风浪掀沙、底沙过境、洪枯季变化等因素有关;南港段河床质季节性变化大于北槽;南港河段河床底质有细化的趋势;长江口深水航道回淤物质偏粗且与周边河床质组成相近,航道回淤应关注滩槽泥沙以近底高含沙水流方式的交换。
On the basis of previous studies and a large number of on-site sampling data of long-term, continuous and large-scale river bed sediments, the spatial and temporal distribution characteristics of sediment in the south-north-north channel of the Yangtze Estuary were analyzed. From the sediment quality of the Yangtze River estuary, Deepwater channel back silting material sources were discussed. The results show that the river bed quality of the Yangtze River estuary is characterized by its fineness, coarseness and fineness, uneven distribution in time and space. The river bed quality changes in the north-south channel are related to the storm surge, sediment transport and flood season changes. The seasonal variation of river bed quality is greater than that of the north channel; the bed quality of the riverbed in Nangang section is refined; the material of backwater in the Yangtze River Estuary deepwater channel is thicker and similar to the surrounding river bed mass composition; Sandy water flow exchange.