• Proceedings of the Korean Environmental Sciences Society Conference
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• 2019.10a
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• pp.61-61
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• 2019

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2019.10a
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• pp.63-63
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• 2019

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2019.10a
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• pp.65-65
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• 2019

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2020.10a
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• pp.84-84
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• 2020

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2004.11a
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• pp.149-153
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• 2004

본 연구에서는 태풍의 천애역 내습시 태풍의 풍역이동과 위험반경내의 풍향 풍속 변화를 해안지형의 특성에 따라 파랑이 충분히 발달할 수 있는 해역을 대상으로 발생가능한 풍향별 취송거리 및 관측된 풍향 풍속으로 천해설계파를 산정하기 위한 한가지 수치해석기법을 소개한다. 이를 통해 구조물 전면에서의 파고계산을 위해서는 구역을 결정할 때 해역의 개방 정도 및 폐쇄성과 태풍중심 이동경로가 천해설계파 산정시 중요함을 강조 할 수 있다. 실시간 해석기법에 대해서 부가적인 재해석 절차가 필요한 상황이지만 본 연구의 해석기법은 연안 해안지역의 천해설계파를 추정함에 있어 태풍의 천해역 통과시 풍역의 변화특성과 이를 고려한 파랑의 불획 정성을 극복하고 보완 할 수 있는 천해설계파 산정을 위한 기초적 연구로서 활용될 수 있을 것이라 판단된다.

• Journal of Navigation and Port Research
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• v.37 no.6
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• pp.611-616
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• 2013

This paper studies relationship between typhoon and El Ni$\tilde{n}$o La Ni$\tilde{n}$a events by using 25 years meteorological data of KMA and JMA. The results are listed below. Annual mean number of typhoon's occurrence in El Ni$\tilde{n}$o event year is 23.9, and that in La Ni$\tilde{n}$a event year is 24.9. The number of typhoon's occurrence decreases in El Ni$\tilde{n}$o event year. Mean central minimum pressure and mean maximum wind speed in El Ni$\tilde{n}$o event year are 959.3hPa and 35.8m/s, and those in La Ni$\tilde{n}$a event year are 965.5hPa and 33.7m/s respectively. Intension of typhoon is stronger in El Ni$\tilde{n}$o event year than La Ni$\tilde{n}$a event year. To be more specific mean central minimum pressure is lower 6.2hPa and mean maximum wind speed is stronger 2.1m/s. This result is closely connected with sea area of typhoon's occurrence. Typhoons in El Ni$\tilde{n}$o event year are more likely to occur in east of 150E and south of 10N, but those in La Ni$\tilde{n}$a event year are more likely to occur in 120-150E and north of 20N. Typhoons which occur in east of 150E and south of 10N can be stronger because the typhoons move in broad sea area of high sea surface temperature in western North Pacific.

• Journal of Navigation and Port Research
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• v.34 no.6
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• pp.453-458
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• 2010

This paper studies relationship between global warming and trends of typhoon variation by using the meteorological long-term data. The results show that yearly mean typhoon's occurrence numbers decrease and maximum wind speeds strengthen gradually. These results are in accord with most of simulated results. While the normal course of typhoon is increased, the westward course of that is decreased. Typhoon trajectories show that the ratios of normal course 6 : westward course 3 : abnormal course 1 in the last 10 years. Among typhoons which affect to the Korea ones pass through the southern coast of Korea are the most. The numbers of typhoon pass through the western coast of Korea are decreased and those pass through the eastern coast of Korea show increasing trend lately. The notable point in relation to the global warming is that typhoon intensity is strengthened gradually. Watch and counterplan in the viewpoint of prevention to the meteorological disasters are required.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2011.06a
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• pp.232-233
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• 2011

이 연구에서는 최근 25년간(1986-2010년)의 우리나라 기상청 및 일본 기상청 자료를 사용하여 엘니뇨 라니냐 현상과 태풍과의 관계를 분석하였다. 여기서는 엘니뇨감시해역의 해면수온의 기준치와의 차의 5개월 이동평균치가 6개월 이상 계속하여 $+0.5^{\circ}C$ 이상 이 된 경우를 엘니뇨현상, $-0.5^{\circ}C$ 이하가 된 경우를 라니냐현상이라고 정의한다. 그리고 엘니뇨 발생년은 엘니뇨현상이 시작된 해부터 종료된 해까지를, 라니냐 발생년은 라니냐현상이 시작된 해부터 종료된 해까지로 정의한다. 주요 분석 결과는 다음과 같다. 전 기간에 대한 태풍의 연평균 발생 수는 25.4개이다. 이는 60년간(1951-2010년)의 연평균 태풍 발생 수 26.3개보다 약 1개 적은 결과로 최근 지구온난화와 관련하여 태풍의 발생 수가 감소 추세를 보이고 있다는 연구 결과를 뒷받침한다. 엘니뇨 발생년의 연평균 태풍 발생 수는 23.9개이고, 라니냐 발생년의 그것은 24.9개이다. 적도 부근 서부 태평양의 따뜻한 물이 동쪽으로 이동하여 동부 태평양의 해면수온이 평년 이상으로 높아지는 엘니뇨 발생년에 태풍의 발생 수가 감소한다는 사실을 알 수 있다. 태풍의 세기를 나타내는 평균 중심최저기압과 평균 최대풍속은 엘니뇨 발생년에 959.3hPa과 35.8m/s, 라니냐 발생년에 965.5hPa과 33.7m/s 그리고 25년 전 기간에 대하여는 962.3hPa과 35.0m/s이었다. 엘니뇨 발생년의 태풍의 세기가 라니냐 발생년의 태풍의 세기보다 강함을 알 수 있다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.27 no.4
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• pp.474-482
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• 2021

An average of two to three typhoons that occur in the Philippines or Taiwan pass through Korea each year owing to the influence of the geographical location and western winds. Because Jinhae Bay is known as Korea's representative typhoon refuge, it is filled with ships during typhoons and later becomes saturated with ships anchored to the surrounding routes. If a strong wind drags an anchored ship, a collision accident may occur because of the short distance between the ships. Therefore, a systematic anchoring safety management of Jinhae Bay is required. In this study, the minimum wind speeds of a dragging anchor based on the water depths of Jinhae Bay anchorages were investigated. When 7-9 shackles were given, the minimum wind speeds were 48-63, 46-61, and 39-54 knots at depths of 20, 35, and 50 m, respectively. As the water depth increased, the length of the cable laid on the sea bed became shorter than 5 m owing to the external force, and the minimum wind speed showed a significant difference of 4-8 knots. In addition, ships with high holding power anchors (AC-14 type) had higher minimum wind speeds than ships with conventional anchors (ASS type). Finally, it was confirmed that at a depth of 50 m, dragging easily occurred even when a high holding power anchor was applied.

• Journal of Navigation and Port Research
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• v.38 no.6
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• pp.695-700
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• 2014

This paper analyzed the peak stage of typhoons by using 10 years(2002~2011) data. The main purpose of this research is to provide the characteristic and tendency of peak stage of typhoons for navigators of ship. The research results show that typhoons of maximum wind speed 20~29m/ s and 40~49m/s account for 25% and 24% of whole typhoon, respectively. Ultra Typhoon of maximum wind speed 50m/ s and over accounts for 24% of whole typhoon. Peak stage mean arrival time from tropical depression and tropical storm are 3.6 days and 2.1 days, respectively. Duration time of peak stage is within 2 days and mean duration time of peak stage is 31hours. Latitudes and longitudes that mainly appears peak stage are at $15^{\circ}{\sim}25^{\circ}N$ and $120^{\circ}{\sim}140^{\circ}E$. This dangerous sea area has the oceanic environmental characteristic that Taiwan and Philippines are locate west side and a vast the North Pacific occupy east side. Navigators of ship in this dangerous sea area keep strict watch. Ultra Typhoons occur most frequently in September. Peak stage of Ultra Typhoon also appears at $15^{\circ}{\sim}25^{\circ}N$ and $120^{\circ}{\sim}140^{\circ}E$.