항만공진주기와 선박동요량을 고려한 항만가동율 산정
Evaluation of Effective Working Days in a Harbor Considering Harbor Resonance and Moored Ship Motion
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초록
본 연구는 선박의 크기, 계류조건, 파랑의 주기, 파향 등에 의한 계류선박의 동요량을 해석하고 선박의 하역한계파고 산정 및 항만가동율을 평가하는 방법을 제시한 것이다. 본 방법은 포항신항 제8부두의 파랑관측자료를이용하여 타당성을 검증하였다. 하역중단 시 파랑관측 자료는 파고 0.10~0.75 m, 주기 7~13 s 이었으며, 이때 계류된 선박은 800~35,000톤 이었다. 그리고 본 방법으로부터 산정된 제 8부두의 하역한계파고는 선박 5,000, 10,000,30,000톤에 대하여 파고 0.19~0.50 m, 주기 8~12 s로 산정되었다. 본 방법의 결과는 연구대상 선박의 크기가 현지선박의 크기와 정확히 일치하지는 않아서 파고는 관측치와 다소 차이를 보이지만 주기변화에 따라 하역한계파고를잘 재현하고 있음을 알 수 있었다. 그리고 파향이 75도 인 경우의 본 방법에 의한 하역한계파고는 현행 항만설계기준에 제시된 한계파고 보다 장단주기 파를 고려하면 16~62% 감소하였고, 단주기 파랑만 고려하면 0~46%감소하였다. 특히 현행 항만설계기준의 하역한계하고는 10,000톤 이하의 선박에 대해서는 과대 평가되었음을 확인할 수 있었다. 한편, 선박의 동요량을 고려하여 산정된 포항신항 제 8부두의 가동율은 설계기준 파고에 의한 가동율 에 비하여 6.5% 감소하였다.
Abstract
This study proposed an estimation method of allowable wave height for loading and unloading of theship and evaluation of effective working days considering moored ship motion that is affected by sip sizes, mooringconditions, wave periods and directions. The method was examined validity by comparison with wave field data atpier 8thin Pohang New Harbor. The wave field data obtained with wave height of 0.10~0.75 m and wave period of7~13 s in ship sizes of 800~35,000 ton when a downtimes have occurred. On the other hand, the results of allowablewave height for loading and unloading of the ship in this method have obtained with wave heights of 0.19~0.50 mand wave periods of 8~12 s for ship sizes of 5,000, 10,000 and 30,000 ton. Thus this method well reproduced thefield data respond to various a ship sizes and wave periods. And the results of this in Korea are didn’t respond tovarious the ship sizes and wave periods, and we h method tended to decrease in 16~62 percent when haveconsidered long wave, and it is decreased in 0~46 percent when didn’t consider long wave than design standards incase of the ship sizes of 5,000~30,000 ton, wave period of 12 s and wave angle of 75o. The allowable wave heightsfor loading and unloading of the ship proposed by design standards in Korea have found that overestimated onsmaller than 10,000 ton. On the other hand, the rate of effective working days considering ship motion at pier 8thinPohang New Harbor reduced in 6.5 percent when compare with the results without considering ship motion.
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