#TITLE_ALTERNATIVE#

• Main Author: RAMDHANI (NIM. 25511301), MEIRITA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/28841
• Institution: Institut Teknologi Bandung

Coastal forests has been considered as a coastal protection from ocean waves because of its hydraulic <br /> <br /> resistance assumed to be able to attenuating the ocean waves. These theses study the coastal forests ability <br /> <br /> to attenuating tsunami waves and compare the results with other coastal protection structures such as seawall, using the numerical model COMCOT. Located in Pangandaran beach area at month July 2006, 3 models scenario has been executed: Scenario A (to validate the model), Scenario B with coastal forests (presented as equivalent manning roughness) and Scenario C with coastal structures (presented as modification of bathymetry). Two kinds of coastal forests have been executed in the models: existing <br /> <br /> forest (B1) from field survey of Husrin and Kelvin (2013), and parameterized mangrove forests of Husrin (2012). While, for scenario C, the structure that used in the simulation assumed as a simple rectangular structure with specified width and height. The results of scenario A models is validated using 18 point of runup measurement data of Lavigne, et al. (2007) the results shows errors about 18%. Next, the model results of scenario B shows that the existence of existing forests (B1) with minimum width (50 m) shows to be able to attenuate the inundation width until 535 m, meanwhile, the mangrove forests (B2) with maximum width (500m) used in the simulation, the inundation width can be reduce into 657 m. The model results of scenario C shows that, the role of coastal structures to attenuating tsunami waves will be more influenced by the dimension of the stuctures especially the height of the structures. With minimum height and width (T=5; L=4.5 m) the inundation width can be reduced until 330 , and with maximum width and height (T=8; L=9 m) the inundation width can be optimized until 790 m. The simulation results of scenario C has been compared with the events of Japan tsunami 2011. Based on the analisis of the runup height, difference between coastal structures and wave height which struck the structure, it can be <br /> <br /> concluded that the results of model scenario C is comparable with the real tsunami events in Japan (2011). <br /> <br /> While the results with coastal forest has not been compared with any tsunami events so that deeper study <br /> <br /> is needed before implementing this results of scenario B as a real coastal protection.