长江中游芦家河水道维护性疏浚技术

Maintenance dredging technology of Lujiahe waterway in middle of the Yangtze River

芦家河水道位于长江中游砂卵石河段中下段,多年来碍航严重,目前主要通过维护性疏浚维持航道畅通。以2018年维护性疏浚为背景,分析河道特点和碍航原因,提出疏浚思路、方案及设计参数,并利用数学模型分析疏浚工程的效果。结果表明,结合芦家河水道复杂的碍航原因,近期宜采用兼顾控制上游水位和水浅问题、坡陡流急与航宽尺度改善相结合、提前疏浚以降低枯水位维护压力、兼顾施工与通航的分区分层作业的疏浚思路,清除三宁化工码头前沿浅包以及毛家花屋航槽右缘乱石堆。工程实施后,能保证枯水期的通航水深,对水位影响较小且降低了疏浚区附近流速,可为船舶上行提供较宽的缓流区。

Lujiahe waterway is located in sandy-pebble section of middle of the Yangtze River,and it is seriously obstructed navigation for many years.At present,maintenance dredging technology is used as the main way to ensure the waterway unobstructed.Combining with the maintenance dredging technology of Taipingkou waterway in 2018,we analyze the characteristics of riverway and the causes of navigation obstruction,propose dredging idea,scheme and design parameter,and analyze the effect of dredging engineering by mathematical model.The results show that according to the complex navigation obstruction reasons of Taipingkou waterway,multiple factors should be taken into account in dredging ideas at present,such as upstream water level control with shallow water depth improvement,steep slope and rapid flow problem improvement with channel width improvement,dredging in advance to reduce maintenance pressure of low water level,layered operation with consideration of construction and navigation.Dredging areas include shallow pack at the front of Sanning Chemical Terminal and rubble piles on the right edge of Maojiahuawu.After the implementation of the project,the navigable depth in dry season can be guaranteed.Influence on water level upstream channel is little.Velocity near the dredging area can be reduced.It can provide a wider slow-flow area for ships.