Planning of coastal protection structures in the area of Arung Dalam Beach, Central Bangka

Abstract

Arung Dalam Beach underwent significant process of coastal erosion. This study aimed to determine the Hydro-Oceanographic conditions in Arung Dalam Beach using MIKE 21 FM and planning of coastal protection structures. The currents pattern during high tide was dominant from the northwest to the east with a rate of 0.042-0.09 m/second. The current pattern was dominant at low tide from the east to the northwest with a rate of 0.056-0.112 m/second. The wave pattern in the west season is prevalent from the north to the southwest with a height of 0.35-0.75 m; the wave pattern in the east season is prevalent from the northwest to the southwest with a height of 0.08-0.56 m. Sediment transport was perpendicular to the coast, which caused coastal erosion, with average coastal erosion occurring at -0.52 m/year. Coastal protection structures to overcome coastal erosion were offshore breakwater structures using crushed stone material. The length of the breakwater is 250 m; peak elevation 3.7 m; breakwater height 4.2 m; grain weight of protected layer 0.3 tons; the width of the crest of the breakwater is 2 m; 1.2 meters thick layer of protection; the number of grains per unit area of 1 m2, totalling 5 grains.