Analysis of Wave Spectrum Change of Porous-Saw Floating Breakwater

The theory and the performance of floating breakwaters have been widely researched and developed by researchers, both physical and numerical models. This study has tested the floating breakwater model with pontoon, saw, and saw-porous types. These models have been analyzed experimentally on irregular waves with JONSWAP spectra at various wave heights and periods and water depths of 35 cm, 40 cm, and 45 cm. This experiment has been carried out to know the change in the shape of the wave spectrum before and after passing the floating breakwater, indicating the occurrence of energy reduction (Δm₀). This study has found out that the saw-type floating breakwater has an average reduction in wave spectrum energy of 25.75% greater than the pontoon type. The porous saw type has an average wave energy spectrum reduction of 1.78%, smaller than the pontoon type. The relationship between the transmission coefficient (K_t) and Δm₀ on a floating breakwater is generally inversely related. The smaller K_t value indicates more effective attenuation than the floating breakwater, while at Δm₀, the more significant value indicates more effective attenuation than the floating breakwater.