长江仪征水道河床演变及航道条件变化分析

三峡水库蓄水对坝下河道产生长距离的影响，对近坝河段影响尤为显著，而对大通以下河口段的影响尚未进行系统研究。通过对近年来仪征水道航道演变特点及主要影响因素的分析，重点探讨了水沙条件变化与航道条件的对应关系，表明三峡水库的蓄水影响范围已经到达下游河口段，揭示了来沙量逐步减少对航道条件影响的复杂性。指出在三峡水库蓄水的持续影响下，对河口段重点河段洲滩进行守护，维持良好的滩槽型态，对维持航道条件的稳定具有重要作用。

Study on river evolution and change of channel conditions in Yizheng channel of Yangtze River

After the impoundment of TGP,a long-range effect would be generated in the downstream,especially the Jingjiang reach near the dam.However,the impact on the estuary below Datong is not systemically studied.Through the analysis of evolution features and the main influential factors of Yizheng channel,the relationship between changes in water and sediment condition and channel condition is focused.And it shows that the influential range has involved the lower reaches of the estuary.The influence of gradual decrease of sediment on the channel condition is complex.Under the continuing influence of TGP,the stability of some important reaches of the estuary should be maintained,so as to protect the type of shoal and trough and benefit the navigation.