Abstract
The present study describes a numerical investigation on the hydrodynamic characteristics of the impinging and overtopping by solitary waves on an emerged impermeable trapezoidal seawall on a sloping beach. A flow solver of Navier-Stokes equations is employed with the constrained interpolation profile method and a volume-of-fluid type method to capture the strong nonlinear free surface. Three typical solitary waves are simulated to validate the capability of the numerical model. A favorable agreement between experimental and numerical results reveals that this model can reproduce the nonlinear hydrodynamic features of solitary wave impinging and overtopping involving vortex, breaking and impacting. Furthermore, parametric studies are conducted by numerical modeling to examine the effects of wave parameters including water level and wave nonlinearity and leeward slope ratio of the seawall on hydrodynamic stability including sliding and overturning stability and erosion potential. Vorticity and pressure fields are exhibited to show the dynamic properties of flow separation, air entrainment and breaking. It is found that the wave parameters and leeward slope ration influence the hydrodynamic stability of the seawall and erosion of the leeward slope in a different way.
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