海岸带盐沼植物能够减小波浪流速、削弱波能，具有生态缓冲功能，研究河口海岸盐沼植物对波浪的消减机理对于近岸区域的固岸护堤具有重要意义。本研究利用开源CFD软件包OpenFOAM建立三维数值模型。首先模拟了溃坝波越过三角障碍物及孤立波在斜坡海岸的爬坡过程，结果显示OpenFOAM模型可精确地捕捉溃坝波传播和孤立波自由水面的运动过程。随后模拟了孤立波在植物波浪水槽中的形成、发展和衰减过程，孤立波通过植物带后波高明显降低，植物对波浪能量的衰减作用明显。最后探讨了正弦波在植物海岸上的传播过程，结果表明波高衰减程度与入射波波高、植物密度、植物拖曳力以及海岸坡陡均成正比。

As an ecological buffer zone, the salt marsh plants growing in the coastal zone play an important role in reducing the current velocity, weakening wave energy and preventing coastal erosion, it is of great significance to investigate the mechanism of wave attenuation by salt marsh plants in estuaries and coastal zones. Based on the open source CFD software package of OpenFOAM software, a 3D numerical model considering the effect of vegetation on flow and wave was established in this study. Firstly, the model was applied to investigate the propagation processes of dambreak wave over the triangle obstacle and the solitary wave climbing on the sloping beach, the results show that the OpenFOAM model can accurately capture the propagation of dambreak waves and free water movement of solitary waves. Then this model was also used to simulate the formation, development and attenuation of solitary waves in a vegetated wave flume, where the wave height of solitary waves decreases obviously through the vegetation zone, the vegetation can effectively attenuate wave energy on a coastal beach. Lastly, the propagation process of sine waves on the vegetated beach was numerically studied, the obtained numerical results show that the attenuation of wave height is directly proportional to the incident wave height, plant density, the drag force coefficient of plant and the steepness of the coast.