港珠澳大桥工程二维潮流数学模型研究

文章建立了基于无结构网格的港珠澳大桥所在海区平面二维潮流数学模型,并采用潮流数值模拟手段对该海区的潮流动力进行了模拟研究,分析了大桥工程周围海域的潮流动力影响。为了在宽广海域中刻画桥墩的阻水影响,将桥墩概化为陆地,并采用桩基阻力处理方法处理桥墩阻力。通过研究采用了局部网格加密方法,桥墩处最小网格长度仅2.39m。研究结果表明:港珠澳大桥的建设对伶仃洋潮流的影响甚微。若以流速变化0.01m/s作为有显著影响的判断标准,则工程对潮流的影响仅限于内伶仃岛与桂山岛之间的大桥及人工岛附近。大量的研究结果可为论证港珠澳大桥建设方案的可行性提供理论依据。

Research on two dimensional tidal flow mathematical model of the Hong Kong-Zhuhai-Macao Bridge engineering

Based on irregular triangular grids,a 2-D tidal flow mathematical model of the sea area where the Hong Kong-Zhuhai-Macao Bridge located was established in this paper,and the tidal power in the sea area was also studied with the tidal current numerical simulation method.Then the tidal power influence around the bridge project was analyzed.In order to reflect the anti-water influence of piers in broad sea area,the piers were simplified as dry land,and the resistance of bridge pier was treated as the pile resistance.The local grid refinement has been used in the research.The shortest length of grids around bridge pier was 2.39 m.The results show that the construction of the Hong Kong-Zhuhai-Macao Bridge has a little effect on the tidal current of Lingdingyang Bay.If take the change of flow speed correct to 0.01 m/s as the judgment standard of remarkable influence,the effect of the project on tidal current is only limited around the bridge and man-made islands between Neilingding Island and Guishan Island.The research results provide the theory basis for feasibility of the Hong Kong-Zhuhai-Macao Bridge construction plan.