Numerical Modeling of the Effect of Porosity on Mooring Tensions in a Porous Double-slope Floating Breakwater

Department of Ocean Eng., Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia

^* Corresponding author: sujantoko@its.ac.id

Abstract

A floating breakwater is a structure used to solve existing problems due to activities around the coast. Floating breakwaters are becoming a more attractive alternative because of their mobility, costeffectiveness in deep coastal waters, and reduced impact on the marine environment. Floating breakwaters consist of floaters with buoyancy to support facilities above the water surface. Floating breakwaters are moored when operating on the high seas using conventional mooring systems or mooring lines. In this study, a numerical investigation of the mooring tension was conducted on a porous double-slope floating breakwater with variations in porosity in the configuration of the mooring ropes of the marine system. Based on the results of numerical testing, it can be seen that the greater the porosity level, the greater the resulting maximum tension. At 5% and 10% porosity, the maximum tensions are 83.12 and 76.14 N on a 45° slope and 82.46 and 82.95 N on a 60° slope, respectively.