Abstract
As a kind of marine plant, kelp plays an important role in the improvement of marine environment. In addition, kelp arrays exhibit a great potential for wave attenuation. In this paper, a kelp-box type floating breakwater is proposed and experimental studies are carried out. Firstly, comparative experimental studies of the wave attenuation performance of kelp-box type floating breakwater with different kelp lengths, planting intervals and the number of rows of kelp arrangements are conducted. Secondly, the mooring force and motion responses of kelp-box type floating breakwater with different arrangements of kelp are compared exhaustively. Finally, a numerical model of the interaction between wave and kelp-box type floating breakwater is set up. The mechanism of wave energy dissipation is analyzed based on the velocity field, evolution of vorticity and turbulent kinetic energy around the kelp-box type floating breakwater. The results indicate that kelp improves the wave dissipation capacity of box floating breakwater. And kelp-box type floating breakwater with longer kelp lengths, denser planting intervals and more rows of planting exhibits better wave attenuation performance, especially for long waves. In addition, variations in turbulent kinetic energy and shedding of vortices are the main causes of wave dissipation of kelp-box type floating breakwater.
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