PLANNING OF NATURAL COASTAL PROTECTIVE STRUCTURES ON THE NORTH COAST OF PEKALONGAN, JAVA ISLAND

• Main Author: Immanuel Wijaya Malau, Gideon
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61778
• Institution: Institut Teknologi Bandung

Indonesia is an archipelagic country that has a long coastline and takes advantage of it in many ways, both in economic, social and cultural aspects. Therefore, a coastal protection structure is needed to overcome the damage in coastal areas due to erosion. The structure applied in this final project is a natural coastal protection structure, which is a combined or hybrid engineering structure between natural beach protectors using mangrove vegetation and combined with temporary breakwaters in front of the vegetation. Planning of natural coastal protection structures on the North Coast of Pekalongan requires design criteria obtained from observations and processing of environmental data, namely wind data, wave data, tidal elevation data, bathymetry data and soil sediment data. Then an ecological assessment is carried out to compare and select the appropriate type of coastal protection to be applied at the study site to obtain a structural design concept. After obtaining the design concept of the plan, wave transformation modeling was carried out with the help of the SWAN program at the study location. This modeling was carried out to determine the location of the greatest erosion due to high waves with the highest wave height at the review location being 1.28 m. It takes a wave height of 0.6 meters behind the temporary breakwater to ensure the young mangrove vegetation is not damaged. Then modeled the wave height at the review location after being given a temporary breakwater with a certain configuration and layout. With the best configuration results, we managed to get a maximum wave height of 0.6 m with a height reduction of 54.76%. Then calculated the depth of bamboo piling to overcome the problem of scouring and dislodgement. Finally, the final layout of the natural coastal protection structure is made.