THE EFFECTIVENESS OF TRAPEZOIDAL BREAKWATERAND TRENCH AS WAVE DAMPERS

• Main Author: Natanael
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/81517
• Institution: Institut Teknologi Bandung

Beaches require protection from high waves to prevent abrasion and erosion. This study evaluates the effectiveness of coastal defense structures in reducing incoming wave amplitudes using trapezoidal-shaped trench and submerged breakwater models. These shapes can be seen as extensions of the rectangular models that have been extensively studied previously. Using numerical and analytical approaches, we developed a 1D shallow water equation that accounts for friction factors to calculate the transmission coefficient (Kt) as an indicator of wave attenuation. Analytical solutions were obtained through the method of separation of variables, while the finite volume method on a staggered grid was used for numerical simulations. In this study, a comparison between analytical and numerical solutions is conducted, particularly focusing on the relationship between Kt and the depth ratio as well as the friction coefficient. This study also examines the effectiveness of adding foot domains to the trapezoidal model in reducing wave amplitudes. It is expected that this geometric modification can enhance coastal protection more effectively.