横沙东滩位于长江口拦门沙区域，该区域建设大型挖入式深水港的关键问题之一是港池及进港航道的可维护性。本文从自然水沙特性出发，对港池及其口门选址、港池及进港航道的可维护性等问题作探讨分析。分析结果认为：港池口门位置宜设置在横沙东滩东侧鸡骨礁及以南区域，开口方向宜偏SE向，口门及进港航道均需设置在10 m以深水域，由此港池及进港航道回淤量较小，港池进潮量较大，具有较好的可维护性。

Hengsha east shoal is a large mouth bar in Yangtze estuary. The main problem of building large excavated-in deepwater harbor basin here is the maintainability of the basin and waterway. In this paper, on the basis of the characteristics of current and sediment, the basin and its entrance sites selection and the maintainability of the basin and waterway are discussed. The results show that the entrance of the basin should be set in the east side of Hengsha east shoal and on the south of Jigu reef, and towards southeast. The entrance and waterway should be built in the area where the depth is greater than 10 m. If do so, the tidal prism is large; the siltation is small, and the maintainability is good.