Determination of Submerged Breakwater Location for Coastal Protection in Panjang Island Waters Jepara

A R T I C L E I N F O A B S T R A C T Article history: Received: 26 July, 2019 Accepted: 08 September, 2019 Online: 22 October, 2019 Panjang Island is one of the islands which is categorized as a small island and is located in Jepara District, Jepara Regency, Central Java Province. The problem faced by Panjang Island is erosion, which increasingly erodes the shoreline and begins to damage buildings on the beach. A solution that is effective enough to overcome erosion or changes in the coastline is to build coastal shelters to reduce wave energy and increase sediment supply. The purpose of this study is to study the exact location of the submerged breakwater from aspects of wave parameters. The method used is wave forecasting and numerical wave model scenarios for submerged breakwater structures. The results showed wave height forecasting results in the western season (December, January, and February) is 2.66 meters, in the first transition season (March, April, May) is 2.14 meters, at east season (September, October, December) 1.45 meters, in the second transition season (June, July, August) is 2.26 meters. The model simulation results with a scenario based on the plan show the most effective damping in the east season with a reduction of 52.26%.