通州沙西水道整治对12.5m深水航道影响研究及对策分析

为分析通州沙西水道整治工程对长江南京以下12.5 m深水航道整治一期工程的影响,通过物理模型试验进行深入研究。研究表明,西水道整治工程实施后,西水道开挖至-8 m或不开挖,东水道分流比增加,对深水航道影响较小,但会造成深水航道左侧通州沙滩地窜沟的冲刷;随着开挖深度增加,其对深水航道影响逐渐增加,开挖至-12 m、-14.7 m时,航道沿程会出现一定淤积,营船港下航道浅区有淤积的趋势,不利于航道维护,但通州沙滩地窜沟略有淤积。建议:通州沙西水道整治时,西水道疏浚深度不宜过深;尽快实施通州沙潜堤下延工程。

Influences of Tongzhou shoal west channel regulation on 12.5 m deepwater channel and countermeasures

In the existing model of the Yangtze River estuary section,through movable bed model experiment,the influences on 12.5 m deepwater channel phase I project of Tongzhou shoal west channel regulation project are studied.After implementing the west channel regulation project,the -8 m excavation scheme and no excavation scheme are both good for the maintenance of deepwater channel depth,but Tongzhou shoal beach ditches on the left side of the deepwater channel are eroded.With the increase of the excavation depth,the impacts on the deepwater channel increase gradually.When the excavation is to -12 m or -14.7 m,the influences reach Yingchuangang,but beach ditches are slightly deposited,which are favorable for the stability of the sand body.This study proposes that the excavation depth should not be too large,and the downstream extension engineering of Tongzhou shoal submerged breakwater should be implemented as soon as possible.