Experimental study of wave attenuation performance of vertical pile-restrained pontoon-plates floating breakwater

A new kind of floating breakwater,vertical pile-restrained pontoon-plates floating breakwater is proposed.Laboratory physical model tests were performed to study the wave attenuation performance and heave motion response of different kinds of pontoon-plates models.Influence of model geometric parameters(relative pontoon width,plate width,number of plates,distance between bottom of pontoon and plate) in wave attenuation performance and heave motion response were discussed,as well as the relationship between the wave attenuation performance and heave motion response.The results indicate that the wave attenuation performance of the new structure is improved.Its transmission coefficient and heave motion height are reduced 0.2 and 0.3 Hi(Hi is incident wave height) respectively compared with those of pile-restrained pontoon floating breakwater model at B/L=0.2.Furthermore,the fitting expression of transmission coefficient is obtained by multiple regression analysis.