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A midwater artificial floating reef is set in the middle layer of the depth from 500m to 1500m. The fish reef has a cylindrical shape. Its diameter and height are 2m and 7m respectively. The upper part of the mooring line is made of the wire rope with a diameter of 32mm. The lower part of the mooring line is made of the polyester rope with a diameter of 42mm.This fish reef rarely is carried away to the sea surface by the snapping of the mooring line. As this measure, the fish reef has the alarm sending device and sonar reflecter. However it is generally difficult to recognize to floating fish reef after sunset and the sound of engine hinder the warning sound. Further, the safety devices are not always normality operated by an attached organism. So, we have to consider the possibility of that the fishing boat has a collision with the floating reef.In this study, we investigate the collision force between the fishing boat and the floating reef on sea surface by the hydraulic model experiment.

EXPERIMENTAL STUDY ON COLLISION FORCE BETWEEN A FISH BOAT AND A MIDWATER FLOATING FISH REEF BY AN ACCIDENT