EFFECTIVENESS OF HYBRID ENGINEERING COMBINATION OF CEMENTED PVC AND USED TIRES, PROTECTING MANGROVE VEGETATION AND PREVENTING ABRASION ON KALIWLINGI BEACH, EAST BREBES, BREBES REGENCY, CENTRAL JAVA, INDONESIA

Abstract

Brebes Regency has experienced severe coastal abrasion, leading to significant mangrove deforestation, particularly in Kaliwlingi Village, where 186 ha of land has been lost. This research aims to develop and implement a hybrid engineering approach for Wave Breaking Equipment (APO) to protect the coastline and mangrove ecosystems. The study, conducted from July to September 2023, involved field observations at three stations, assessing mangrove vegetation and hydrodynamic conditions. Two dominant mangrove species, Rhizophora mucronata and Avicennia marina, were identified, with an average density of 4,166 trees/ha. Hydrodynamic analysis revealed the influence of tidal currents on erosion, necessitating the embedding of hybrid structures at a depth of at least 1.07 m for stability. The APO was constructed using locally available materials such as bamboo, wood, and PVC reinforcements. The study highlights the effectiveness of hybrid engineering in mitigating coastal abrasion and emphasizes the role of mangrove conservation in shoreline protection.