EFFECTIVENESS OF ARRAYED DISSIPATIVE-TYPE FLOATING BREAKWATERS WITH A BUNDLE OF HORIZONTAL CIRCULAR CYLINDERS

Floating breakwaters have been adopted in the comparatively deep-sea area with a mild wave climate, such asinland seas. In that area, various aquacultural facilities, such as fishponds, oyster farming facilities and so on, areusually installed. The development of highly dissipative floating bieakwaters has been devoted in that sea area forreducing both transmitted and reflected waves from newly constructed breakwaters. We have already studied a newtype of floating breakwater intending to reduce both the reflected and transmitted waves. The breakwater consists of abundle of horizontal cylinders at the center and rectangular floats at the both ends. Major dissipation mechanism isthe wave slamming loss of the horizontally installed circular cylinders near the water surface. Here, spatialarrangement of such breakwaters is precisely examined for effective reduction of both reflected and transmittedwaves in the real sea. For the comparison, the conventional floating breakwater, such as a pontoon-type floatingbreakwater, is also adopted in the experiment.