ANALYTICAL, NUMERICAL AND EXPERIMENTAL STUDIES OF WAVE ATTENUATION BY VEGETATION

• Main Author: Rayung Andadari, Gita
• Format: Final Project
• Language: Indonesia
• Subjects: Geografi matematis
• Online Access: https://digilib.itb.ac.id/gdl/view/38208
• Institution: Institut Teknologi Bandung

Coastal protection is an important issue that needs to be addressed as soon as possible. In many years, protection of the coastal area is approached from an engineering perspective, such as creating an artificial breakwater and giant sea wall. However, this method is resulting in harm to the underwater ecosystem. Vegetation such as seagrass actually acts like the natural barrier so it can be used as a natural breakwater. The wave attenuation by vegetation can be observed through the decrease of wave height. Attenuation is a general term that refers to any reduction in the waves strength. In this research, we will propose a mathematical model to learn about the wave attenuation by vegetation phenomenon. This model is based on Shallow Water Model that modified by adding friction or diffusion coefficient. The advantage of this model is that not only covers the wave attenuation of a long wave but also a short wave. To accommodate the dispersive effect that appears in short waves, we modify the model by adding the hydrodynamic pressure. This model will be solved numerically using a free-damping-error method. Besides confirming with the analytical solution, the numerical scheme will also be confirmed using experimental data. Moreover, using the proposed scheme, we get the result that vegetation can decrease the amplitude of the incoming wave. We found out that this decrease is due to two main factors, i.e. friction coefficient and the length of vegetation.