The Coastal Protection in Ampenan Diesel Power Plant,Mataram City, West Nusa Tenggara : Layout Design Phase

Abstract

High waves and beach erosion are a problem in the Ampenan Diesel Power Plant facility at the Tanjung Karang Beach, Mataram City, West Nusa Tenggara Province, every year. The coastal protection structures are needed in that facility, considering the facility's importance as the electricity power supplier in Mataram City and its surroundings. This article presents the planning of coastal protection structures, especially the best layout to reduce beach erosion in that location. Firstly, the wind measurement data is analyzed, followed by the analysis of wave prediction from that wind data. The coastal process is analyzed based on available evidence to determine the cause of beach erosion in that location. Three structure alternatives were proposed and analyzed using the One-Line Model to obtain the best layout. The third alternative layout gives the best protection, which consists of a 75 m T-shape and a 75 m parallel breakwater. The construction cost estimation and method analysis also give the best result for the third alternative. The third alternative makes significant shoreline advancement in the location and gives minor adverse effects (shoreline retreat) for the surrounding area. The third alternative is still easy to build despite its significant construction cost.