Abstract
The -12m berth in the Misato District of the Port of Kochi is a facility that has already gone into service before the breakwater completion, and then the cargo handling troubles, which are considered to be caused by long-period waves, have ever occurred when mooring ships. Therefore, we installed a reduction system for low-frequency ship motions as a provisional countermeasure until the breakwater is completely constructed, and conducted the field demonstration experiments. This system has winches equipped with high-strength mooring ropes (Tetron Dyneema ropes) on land in addition to the mooring ropes of a ship. The system has a function to control the resonance by shifting the natural period of the mooring system from the predominant period of the long-period waves. In this paper, we described the results of the five field experiments conducted for moored ships during the handling of cargo from FY2014 to FY2015, and confirmed the effects of the reduction system from the experimental results.
