NUMERICAL MODEL EFFECT OF BREAKWATER ON RUNUP WAVE

• Main Author: Listya Elfandana S, Josephine
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/47710
• Institution: Institut Teknologi Bandung

In this research, the writer wants to analyze the optimal breakwater size in reducing runup wave height. Runup waves are the high water levels achieved due to the waves that hit the coast or beach buildings which are calculated from the elevation of calm water levels. High runup waves are the main cause of the phenomenon of abrasion. The phenomenon of abrasion is one of the causes of coastal damage, so we need a solution to reduce abrasion so that the beach will function properly. The height of the wave wave can be reduced using a breakwater. In this final project, the breakwater used is a submerged rectangular breakwater. The shape of the beach used is a beach with one slope. To find out the optimal breakwater in reducing the runup wave, the runup coefficient is used. This is the ratio between the height of the runup wave and the amplitude of the initial wave or R/Am. In addition, to find out the optimal breakwater in numerical wave reduction, a sufficient ratio of wavelength and wavelength ratio is used by comparing numerical and experimental results conducted by Shing Tony (2014). From the results of the validation of numerical simulations with analytic solutions, an error for the R/Am value is quite small. The optimal breakwater size of the analytical solution can be determined by looking at the smallest R/Am value. The numerical simulation results are then validated by Shing Tony’s (2014) experiment, and it is found that the runup height value error is quite small. This means that numerical simulations can visualize the phenomenon well. From numerical simulations, an optimal breakwater size can also be determined based on incoming wavelengths.