2004 Volume 20 Pages 221-226
Furubira and Bikuni Fishery Ports are on the Sea of Japan in Hokkaido, Japan. At these ports, mooring lines have broken from the oscillation of fishing boats moored to the mooring quay. In Bikuni Fishery Port, the hull of a fishing boat was seriously damaged when water level rise drove the boat against the mooring quay. When this happened, the sea ws rough due to a low-pressure storm system, but the waves in the port were not strong enough to cause oscillation of fishing boats.Onsite surveys at these two ports determined that long-period waves are largely responsible for such oscillation. Based on the survey results, the critical wave height for cargo handling was determined, and analysis of port calmness was made under the condition of long-period waves. The analysis showed that countermeasures against the long-period waves are needed in the abovementioned ports.
