广州出海航道三期工程对内伶仃洋滩槽演变的影响

Effects of the third phase of Guangzhou seaward channel project on evolution of flats and channels of inner Lingdingyang

广州出海航道三期及其配套项目工程是伶仃洋水域内的一项重大工程,工程实施前,必须要研究和论证工程建设对伶仃洋水域内的泥沙输移和滩槽演变的影响。根据二维潮流泥沙数学模型计算分析,工程会对蕉门延伸段下段、伶仃洋西滩、西槽等冲淤变化有一定影响,对蕉门延伸段上段和凫洲水道及龙穴岛以东水域冲淤变化影响不大。从长期滩槽演变趋势来看,工程后近20 a内,凫洲水道、蕉门延伸段以及内伶仃洋水域内冲淤演变规律不会发生大的变化,冲淤速率逐渐放缓,伶仃洋三滩两槽的格局将继续维持不变。

The third pPhase of Guangzhou seaward channel project and auxiliary projects is a momentous project,so it is necessary to study the effects on the sediment transport and evolution of flats and channels of the Inner Lingdingyang before the implementation of the project.Base on the calculation and analysis by introducing 2D numerical model of tidal current and sediment,it reveals that the effects will primarily occur in the Jiaomen extending riverway,the west shoal and channel of the Inner Lingdingyang,and less effect will occur in the upper section of the extending riverway of Jiaomen and the water areas to the east of Fuzhou riverway and Longxue island.From the long-term view,the evolution in Fuzhou riverway,Jiaomen extending riverway,and the inner Lingdingyang will not be serious,scouring and silting speed will slow down gradually,and the structure of three shoals and two channels will keep unchanged.