长江口近期水沙运动及河床演变分析

Recent flow-sediment transport and riverbed evolution of Yangtze estuary

利用长江口历史研究成果和近期的水、沙及地形监测资料,系统对比分析和总结长江口水沙特性和河势变化规律,预测长江口河床演变趋势。结果表明:长江口深水航道治理工程建设以来长江口河势总体保持稳定,该工程和南北港分汊口工程的建设对稳定河势起到了重要作用;长江口水沙运动基本规律无明显变化;上游来水来沙条件的变化对长江口滩槽及口外地形变化的影响已有所表现,对北槽深水航道冲淤的影响暂不明显;长江口河势仍会基本按近期变化趋势发展,部分河段的不利变化趋势应当高度重视,必要时须采取相应的工程措施。

The paper uses historical research results of Yangtze estuary and recent flow, sediment and topographic data to analysis and summary of flow and sediment character and regulars of riverbed evolution change, and predict riverbed evolution trend of Yangtze estuary. The results show that since the construction of Yangtze estuary deep-water channel regulation engineering, the river regime remained stable ow^rall, construction of this engineering and the south-north channels engineering are important to remained river steady. The basic law of flow and sediment transport in Yangtze estuary has no obvious change. The upstream inflow and sediment changes cause some changes of foreshore and deep channels, but it＇s not obvious of north deep-water channel, the river regime is still basically according to the recent trend of development, it should pay highly attention to some adverse trends of river, it should take some corresponding engineering measures when it＇s necessary.