中文摘要：

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。

英文摘要：

Based on previous studies and field data from long-term, continuous and broad-scale sampling of riverbed sediments, in the paper we analyzed the spatial and temporal distribution characteristics of bed load in South Channel and North Passage, Yangtze Estuary. Discussion from the perspective of riverbed source on the deposition material in the Yangtze Estuary deep water channel was carried out as well. Results showed that the temporal and spatial distribution of the bedload materials in the Yangtze Estuary was uneven as well; Riverbed changed with flooding season, wind blowing sand, bedload sand transit and so on; The seasonal variation of riverbed in South Channel was greater than that in the North Passage. The Yangtze estuary deep water channel deposition material partial was much thicker than suspend load and much closer to surrounding riverbed material, the channel deposition should pay attention to the exchange between beach and deep water channel trough high sediment flow at the bottom.