Numerical Modelling of Wave Motion and Seabed Response around a Submerged Porous Breakwater

摘要

In this study, a numerical model is developed to investigate the wavemotion and seabed response around a submerged porous breakwaterdue to a surface solitary wave. The wave motion is simulated bynumerically solving the extended Navier-Stokes (NS) equations, andthe seabed response is gained from the numerical solutions of poroelastictheory. The existing wave model (COBRAS) and soil model(PORO-WSSI I) are combined to establish the new model--POROWSSIII. The numerical model is applied to investigate the effects ofporosity and equivalent mean diameter of porous media on the wavepropagation in the vicinity of porous structure. The results show thatthe porosity has more impact than equivalent mean diameter on thewave transformation and flow structure. The solitary wave-inducedseabed responses such as pore pressure and vertical effective stressaround the foundation of porous breakwater are presented as a casestudy.