Evaluation of Effective Working Days in a Harbor Considering Harbor Resonance and Moored Ship Motion

摘要

This study proposed an estimation method of allowable wave height for loading and unloading of the ship and evaluation of effective working days considering moored ship motion that is affected by sip sizes,mooring conditions,wave periods and directions.The method was examined validity by comparison with wave field data at pier 8th in Pohang New Harbor.The wave field data obtained with wave height of 0.10~0.75 m and wave period of 7~13 s in ship sizes of 800~35,000 ton when a downtimes have occurred.On the other hand,the results of allowable wave height for loading and unloading of the ship in this method have obtained with wave heights of 0.19~0.50 m and wave periods of 8~12 s for ship sizes of 5,000,10,000 and 30,000 ton.Thus this method well reproduced the field data respond to various a ship sizes and wave periods.And the results of this in Korea are didn’t respond to various the ship sizes and wave periods,and we h method tended to decrease in 16~62 percent when have considered long wave,and it is decreased in 0~46 percent when didn’t consider long wave than design standards in case of the ship sizes of 5,000~30,000 ton,wave period of 12 s and wave angle of 75o.The allowable wave heights for loading and unloading of the ship proposed by design standards in Korea have found that overestimated on smaller than 10,000 ton.On the other hand,the rate of effective working days considering ship motion at pier 8th in Pohang New Harbor reduced in 6.5 percent when compare with the results without considering ship motion.