Dynamic Behavior Analysis of Porous Saw Floating Breakwater under Regular Waves

Abstract

Porous saw floating breakwaters are floated and tethered breakwaters for coastal protectors with typical steep, deep, and relatively large choppy contours, designed with saw porous, to be able to absorb waves efficiently and effectively. A proposed numerical model was developed for the porous saw type, while the model for the pontoon and the saw type will be used as a comparative study. All types of the structure breakwaters were physically placed inside the flume tank in which the direction of waves was perpendicular (to the structure) with 3 cm height and 1.1 seconds of period conducted in 41 cm depth of water. The numerical model shows that the Response Amplitude Operators (RAO) only affect the sway, heave, and roll motions. The porous saw floating breakwater demonstrates the smallest RAO value among other types i.e. sway 0.66 cm/cm, heave 2.1 cm/cm, and roll 0.86 deg/cm. It means the porous saw type more advantages since the ability to absorb the wave. Moreover, some of the wave energy will be reduced when the wave passes through the structure. Therefore, the wave energy received by the structure and the mooring rope becomes smaller.