NUMERICAL SIMULATION OF WAVE REDUCTION WITH MANGROVE FOREST USING DELFT3D MODELING AT BANYUGLUGUR BEACH

Abstract

Coastal erosion caused by continuous sea wave action is destructive. One potential solution to reduce the impact of waves and coastal erosion is the utilization of mangrove forests as natural barriers. The Banyuglugur Coastal Area has a thriving mangrove forest that grows along 5.1 km of coastline. The objective of this research is to determine the percentage reduction of the mangrove forest as an energy buffer and the wave height along the Banyuglugur Coast. The method employed to achieve this goal involves numerical simulation using Delft3D, considering the influence of mangrove forest length, tides, wind, and wavelength. The Delft3D-Coupling model is used, combining two modules, FLOW for tidal simulation and WAVE for wind-wave simulation. Mangroves with a width of 70 m in Zone A are high-density mangrove locations that can reduce wave energy by 62.14%, while low-density mangroves in Zone D with a width of 30 m can reduce wave energy by 44.28%. The simulation results indicate that mangrove forests on Banyuglugur Beach, with an average width of 50 m, can dampen waves by an average of 52.8% and reduce the average wave height by 39% compared to incoming waves.