Effect of Wave Interaction With Comb-Shaped Floating Breakwater Near Partially Reflecting Seawall and Submerged Porous Structures

This study investigates the interaction of surface gravity waves with a comb-shaped floating breakwater near an inclined partially reflecting seawall at a finite distance from an array of submerged triangular head porous structures. Under the assumption of linearized water wave theory, this study aims to examine the hydrodynamic quantities of interest, including the reflection coefficient, wave run-up coefficient, force exerted on the partially reflecting wall, as well as moments and vertical and horizontal forces on the comb-shaped floating breakwater. Moreover, the radiation of the comb-shaped floating breakwater is tracked by heave, surge, and pitch motion corresponding to added mass and damping coefficients. The numerical model has been developed utilizing the multi-domain boundary element method to analyze oblique wave scattering and radiation. To ensure the precision of the present model, the utilized technique is validated against existing research. The study reveals that as the friction increases, the wave run-up coefficient decreases due to greater drag forces. Moreover, the lower reflection coefficient of the partially reflecting seawall adds internal dissipation and lowers reflected energy peaks; hence, less force is exerted on the breakwater. The intense wave trapping in the confined region between the comb-shaped breakwater and the inclined partially reflecting seawall increased the number of resonance peaks in surge and pitch damping coefficients. Ultimately, this framework enhances the design of adaptive breakwater platforms aimed at providing efficient coastal protection.