长江南京以下深水航道设计最低通航水位初析

长江南京以下深水航道地处感潮河段，如何计算设计最低通航水位是航道建设技术论证的首要工作。通过初步论证分析，得到一些基本认识：对于南京以下河段，现行航道水深起算基面不能视同为设计最低通航水位、不宜轻易调整航道水深起算基面、设计最低通航水位宜统一采用海港方法计算并根据水文条件变化作必要调整、个别河段航道设计水深需大于12.5 m。

On design lowest navigable water level of deep-water channel in Yangtze River reach below Nanjing

Deep-water channel in Yangtze River reach below Nanjing is located in a tidal reach, and how to calculate its design lowest navigable water level is an essential work to the technical demonstration of its channel construction. According to a preliminary demonstration and analysis, some basic conclusions are obtained as follows:the initial base plane of existing channel depth for Yangtze River reach below Nanjing shall not be regarded as its design lowest navigable water level and it shall not be easily adjusted; its design lowest navigable water level shall be calculated by adopting a recommended method listed in Code of Hydrology for Sea Harbor and is necessarily adjusted in the light of a change in hydrological conditions; the design water depth at very few sections should be larger than 12.5 m.