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Variation of Harbor Oscillations in Yeongil Bay
MinSu Jeon,JoongWoo Lee,JaeHyun Jeong,SangYong Yang,YoungHwan Jeong 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.1 No.-
Today, harbor oscillation problems are the most significant factor to consider when designing harbors serving very large ships. In coastal harbors, large vessels moored in the elastic hawsers are often displaced due to the resonance between long period waves and mooring systems. As a result, cargo handling may be interrupted and the hawsers may be broken, especially when the amplification becomes extreme. The most significant harbor confronted with harbor oscillation problem in Korea is Pohang New port. Many cases of problems are being reported by the pilot association and the local office of MOMAF (Ministry of Maritime Affairs and Fisheries). However, it is difficult to prevent the arrival of long waves causing oscillation within this harbor. Moreover, the Korean government has already started a new port plan at the mouth of Yeongil Bay without addressing the problems that have occurred in Pohang New port. This study deals with the variation of harbor oscillation due to the construction of a 4.1 km breakwater at the bay mouth including the arrangement of the new berths. Numerical methods used are in fairly standard form from the extended mile slope equation. The obtained numerical results were compared with field measurement from the previous and this will bring a certain level of discussion and consideration of variation to the future port development.
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현장계측시험을 통한 고속선터널의 미기압파 방출 특성 분석
윤수환(Su-hwan Yun),남성원(Seong-won Nam),권혁빈(Hyeok-bin Kwon),김상수 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.5
최근 국내에서는 고속열차의 주행속도 향상과 고속선 터널단면적 축소를 위한 연구가 활발히 진행되고 있다. 하지만, 우리나라 고속선에는 터널이 많기 때문에 속도향상과 터널단면적 축소를 위해서는 반드시 미기압과의 영향을 검토해야 한다. 본 논문에서는 신속하고 정확하게 미기압과 예측이 가능한 식을 완성하기 위하여 현장계측을 수행하였다. 고속선 자갈궤도터널과 슬라브궤도에서 각각 터널내압력파 및 미기압파크기를 계측하고 각 터널유형에 따른 미기압파 크기를 비교하였다. 진입속도에 따른 미기압파 크기는 자갈궤도터널이 슬라브궤도터널에 비해 낮게 나타나며, 슬라브궤도터널 중에서는 긴 터널이 짧은 터널에 비해 보다 미기압파가 크게 나타났다. 또한, 시험결과를 이용하여 예측식의 주요인자를 결정하고, 예측식을 이용하여 계산된 미기압파 크기가 시험결과와 잘 일치함을 확인하였다. Recently, many researchers are investigating on both speed-up of high-speed train and tunnel cross sectional area reduction. Micro-pressure wave, however, has to be evaluated to achieve the issues because it could make an environment problem. For this object, field measurement was conducted to obtain tunnel pressure wave and micro-pressure wave. The measured micro-pressure wave is compared between the tunnel types. The micro-pressure wave of a ballasted track tunnel was lower than that of slab track tunnel and the micro-pressure wave from a long tunnel was higher than that from a short tunnel at the slab track. Some important factors for a micro-pressure wave estimative formula were defined with the field measurement data. The micro-pressure wave estimated by the formula well corresponded with the field data.
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