长江口南槽5.5m航道维护特点

利用2013—2015年南槽航道疏浚现场资料,分析南槽5.5 m航道维护特点,并探讨南槽5.5 m航道维护形势。结果表明,近3年来南槽5.5 m航道整体保持易于维护的良好局面,其维护特点主要表现在3个方面:1)航道疏浚部位主要处于九段灯船附近局部浅区;2)航道回淤呈现洪淤枯冲的年内季节性差异;3)航槽目前水深不易受台风骤淤影响。鉴于现阶段5.5 m航道维护特点,南槽航道仍将保持整体易于养护的良好局面。

Maintenance features of 5.5 m navigation channel of south passage in the Yangtze estuary

Based on the dredging site data of year 2013 to 2015 in the south passage waterway,we analyze the maintenance features of the 5.5 m navigation channel of South Passage,and discuss the further maintenance situation of the navigation channel.The results show that the maintenance of the 5.5 m navigation channel of south passage is generally kept in a good situation during the past 3 years,and its maintenance features are mainly as follows:1)the dredging location of navigation channel is mainly in the local shallow region near the Jiuduan Lightship;2)the in-year sedimentation of the 5.5 m navigation channel has seasonal differences with siltation in the flood season and erosion in the dry season;3)the existing depth of navigation channel is not easily affected by typhoon-induced sudden siltation.In view of the characteristics of 5.5 m channel maintenance at the present stage,it will keep in good situation of easy maintenance for the south passage waterway.