Abstract
Long-period waves cause failure of cargo handling and break mooring ropes in many ports. One of the counter plans against long-period waves is to extend offshore breakwater in a port. It is an effective way to reduce long-period waves in a port.
In this paper, we propose the method that evaluates such counter plans against long-period waves in terms of the cargo handling operation rate. We examined the difference of the cargo handling operation rate by changing evaluation indices, such as wave height, long-period wave height, and ship motion. Finally, we applied the proposed evaluation method to Hitachinaka port and investigated the effect of long-period wave counter plans.
