港珠澳大桥对伶仃洋滩地演变影响试验研究

介绍了珠江河口整体潮流泥沙物理模型的主要特点.通过清水定床、局部动床及悬沙淤积试验,研究了港珠澳大桥修建后对伶仃洋滩地演变的影响.研究结果表明:港珠澳大桥修建后对河道的行洪、排涝有一定程度的影响;伶仃洋海区涨落潮主流没有明显改变.工程后主流区附近桥址断面局部河床将出现明显的冲刷调整.与无工程相比,工程后伶仃洋各主要浅滩10 a累积淤积厚度有所增大,但量值较小;主要浅滩发展速度呈增大趋势,但变化幅度不大.工程实施后,伶仃洋三滩两槽的总体格局基本保持不变.

Experimental study on evolution of Lingdingyang beach after completion of Hong Kong-Zhuhai-Macao Bridge

The main characteristics of the Pearl River estuary′s tidal current and its sediment physical model are introduced in this paper.Based on the experiments of fixed bed,local movable bed and suspended sediment deposition,the evolution of the Lingdingyang beach after completion of the Hong Kong-Zhuhai-Macao Bridge is studied.The results show that the flood control and drainage in the river channel have some influences and the mainstream of Lingdingyang sea area has no significant change after the project completion.The local river bed near the mainstream section of the bridge site has visible erosion after the project completion.Compared with the situation without the project,the thickness of accumulated sediment in ten years at the Lingdingyang beach has increased,but the increase is small;the rate of development at the main beach has increased too,but slightly.The entire configuration of the three beaches and two grooves will be maintained.