Reflection spectrum analysis of dual-wing floating breakwater under irregularwaves

A numerical model is developed to examine the hydrodynamic interaction of irregular waves with a dual-wing floating breakwater (DWFB) using the boundary element method (BEM). The linear water wave theory has been adopted to investigate the wave scattering problem. For this analysis, three distinct configurations of DWFB geometries are examined. Initially, the numerical results are compared with established analytical solutions from the previous studies under regular wave conditions to validate the proposed numerical method. Subsequently, the reflection (Kr) and transmission (Kt) coefficients of the DWFB, regardless of the shape configuration, were calculated. After the study was extended to the irregular wave conditions to further examine the influence of incident wave characteristics and certain geometrical factors, such as the DWFBs length and submergence depth, on its performance efficiency. To assess the impact of irregular waves on the DWFB, the Pierson-Moskowitz spectrum is considered in the frequency domain, and the incident wave spectra are analyzed to obtain the response spectra for reflection and transmission. This study can aid in evaluating the effectiveness of wave attenuation performance and refining breakwater design to ensure effective coastal protection under various wave conditions.