多向聚焦波作用下跨海桥梁围堰水动力特性数值模拟研究

Numerical Study on Hydrodynamics of Coastal Bridge Cofferdam under Impacts of Multidirectional Focused Wave Groups

该文采用开源程序REEF3D研究了多向聚焦波浪与跨海桥梁围堰之间复杂的相互作用,并且系统讨论了有效波高、谱峰周期、波浪方向分布、波浪入射角、围堰吃水深度和水深等因素的影响。计算结果表明:前五个因素对跨海桥梁围堰所受到的水动力载荷有显著影响,而水深变化对围堰的水动力特性影响较小。围堰的水动力的载荷随有效波高和谱峰周期的增大而增大。波浪方向分布对围堰的水动力载荷也有一定的影响,波浪方向范围越小,载荷越大;随着波浪入射角的增大,围堰所受的水平波浪力随之增大,垂直波浪力变化却不明显;随着围堰吃水深度增加,围堰水平波浪力明显增大,垂直波浪力却减小。该研究结果为跨海桥梁围堰更好地施工提供了相关参考。

In this study,the open-source flow solver REEF3D is applied to investigate the complex interactions between multidirectional focused wave groups and the cofferdam of coastal bridge.Influences of several main factors,such as significant wave height,peak wave period,wave spread angle,wave incident angle and cofferdam draught,and the water depth are systematically discussed.The results show that significant wave height,peak wave period,wave spread angle,wave incident angle and cofferdam draught have significant effects on the hydrodynamic loads of coastal bridge cofferdam,while the variation in the water depth has limited influences on the hydrodynamic characteristics of the coastal bridge cofferdam.The peak values of hydrodynamic loads of the coastal bridge cofferdam tend to increase with the increase of effective wave height and peak wave period.The wave spread angle of the incident waves also has certain effects on the hydrodynamic loads of coastal bridge cofferdam.A decreasing in the wave spread angle of the incident waves can result in an increasing in the hydrodynamic loads of the coastal bridge cofferdam.Although the peak value of the horizontal load exerted at the cofferdam increases with the wave incident angle,the vertical load does not change noticeably with the wave incident angle.With the cofferdam draught increasing,the horizontal load increases largely,and the vertical load decreases.It is believed that the results of this study can provide relevant reference for better construction of coastal bridge cofferdam.