TRAPEZOIDAL SUBMERGED BREAKWATER AND MANGROVES ON REDUCING RISK OF COASTAL EROSIONS

• Main Author: DELFINA, PRISCILA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/65460
• Institution: Institut Teknologi Bandung

Coastal protection is essential for managing shoreline issues brought on by the continuous population growth in coastline. Mangroves have recently gained popularity as coastal protection structures in recreational and residential shoreside areas because of their environmental and aesthetic benefits. However, if mangroves are constantly struck by incoming waves, they will eventually be destroyed. In this study, we're interested in constructing a submerged breakwater between mangrove trees and the open ocean, in the hope of dampening approaching waves before they reach the mangroves. Therefore, in this research, we investigate the wave damping phenomenon created by trapezoidal submerged breakwater and mangrove using a modification of linear Shallow Water Equations. The model will be solved analytically using separation of variables approach to obtain the wave transmission coefficient. Moreover, a finite volume on a staggered grid is used to numerically solve the model. By comparing the analytical and numerical results, we found that the two approaches yield similar results, implying that the numerical scheme can closely approximate the analytical solution. In addition, we analyse how the friction coefficient, mangrove length, and trapezoidal submerged breakwater dimension affect the wave attenuation. According to the simulation conducted in this study, the wave reduction is amplified as the friction coefficient and mangrove length increase. The breakwater dimension, on the other hand, does not have a significant effect upon the wave amplitude reduction.