Selection of cross sections for solitary wave transmission efficient for submeged vertical porous breakwater using Flow-3D model

Abstract

Climate change is causing progressively severe coastal erosion, especially in beaches and tourist areas. Vertical porous breakwaters were chosen to protect the beaches for their effectiveness in reducing waves and preventing erosion. However, submerged vertical porous breakwaters must be applied due to the characteristics of beaches that do not allow shielding. Thus, the width of the porous breakwaters should be increased, incurring construction costs. This study proposes cross-sections of submerged vertical porous breakwaters that have the same width and determines the selected cross-section in those sections that effectively meets the wave height reduction. The Flow-3D numerical model with porous structures and solitary wave boundary conditions was used to simulate 72 scenarios of the interactions between solitary waves and submerged vertical porous breakwaters. The selected cross-section is a parallel configuration, where the distance between the two breakwaters is twice the width of the first breakwater. Dimensionless graph systems defining parallel breakwater parameters according to incoming solitary waves were established.