长江下游南京至浏河口河段沿程设计最低通航水位分析*

随着长江口12.5 m深水航道上延至太仓,为充分发挥长江口深水航道治理工程的效益,更好地发挥长江下游港口和航道的作用,促进长三角地区经济社会协调发展,深水航道上延至南京迫在眉睫。南浏河段河道条件复杂,受径流和潮汐共同作用,现状条件下,要对长江中下游主航道进行经济合理的整治开发必须以确定合理的设计最低通航水位为保证。不受潮汐影响或是受潮汐影响不明显的河段,设计最低通航水位应该用综合历时曲线法来计算取值,受潮汐影响明显的地方采用低潮位累计频率曲线90%来取值,南浏河段受径流、潮汐共同作用,两种方法的适用范围需深入研究。

Design lowest navigation water level of river reach from Nanjing to Liu river estuary on lower Yangtze River

After the 12.5 m deep water channel of Yangtze estuary extends to Taicang, for making full use of Yangtze estuary deep channel regulation works, making better use of lower Yangtze River harbors and channels, and promoting the social and economic development of the Yangtze delta zone, it is in an urgent need to extend the deep water channel to Nanjing. The south Liu river reach is complex in natural condition, with combined influence by river discharge and tide, so it is necessary to assure the design lowest navigation water level in order to suitably and economically carry out the main channel regulations and exploitation of the middle and lower Yangtze River according to the present condition. For the river reaches without tide influence or with insignificant tide influence, the design lowest navigation water level should adopt the synthetic duration curve method, while for those with obvious tide influence, cumulative frequency as 90% of low tide levels should be adopted. The south Liu river reach is influenced by both tide and river discharge, thus further research is necessary to study the scope of applications of two methods.