A Study on the Performance of Floating Twin-hull breakwaters Including Fish-cage

摘要

A floating multipurpose twin hull breakwater has been studied for the application to a fish cage. Since the floating offshore structure is to be exposed to harsh ocean environments, i.e. wave, wind, and current, these effects should be evaluated and considered in the design of the multipurpose structure. The theoretical analysis is appropriate to the parametric study, while the experiments give information about realistic phenomenon. Both the theoretical analysis and experimental tests are used to comprehend the overall effects of the design factors on wave breaking efficiency. The theoretical calculation uses threedimensional source distribution method without considering viscosity. Experiments are performed in a two dimensional water tank. The results of motion responses and transmission coefficients are compared and discussed with variation of drafts and permeability of the nets that are used for the fish cage. It is concluded that the effect of the net’s permeability is insignificant, but the deeper draft is more effective at the longer wave waves. The computational results are fairly matched to the experimental ones except at the resonant frequency. It is recommended to include the viscosity effect in computation specifically at high frequencies and resonance.