长江口南槽5.5m航道维护特点

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

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。

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.