• 제목/요약/키워드: typhoons

검색결과 551건 처리시간 0.029초

남해 해수면온도 변화와 태풍 세기와의 관계 (Relations between Variation of Sea Surface Temperatures in the South Sea of Korea and Intensity of Typhoons)

  • 설동일
    • 한국항해항만학회지
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    • 제32권5호
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    • pp.403-407
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    • 2008
  • 이 연구에서는 36년간(1970-2005년)의 장기 데이터를 이용하여 우리나라에 영향을 미치는 태풍의 대부분이 통과하는 남해의 해수면 온도와 태풍의 세기 변화와의 관계를 분석, 연구하였다. 우리나라 남해의 해수면온도는 연구 기간 동안 지속적으로 상승하는 추세를 보인다. 1996년 이래 10년간(1996-2005년)의 평균 해수면온도는 $16.77^{\circ}C$로 1970년대 10년간(1970-1979년)의 평균 해수면온도 $15.74^{\circ}C$보다 $1.03^{\circ}C$나 높다. 특히, 1994년 이후 그 상승폭은 크다. 태풍의 세기는 최저해면기압에 의하여 나타낼 수 있다. 남해를 통과하면서 우리나라에 영향을 미친 태풍의 최저해면기압의 변화를 살펴보면, 1970년 이후 지속적으로 하강하고 있음을 알 수 있다. 1996년 이래 10년간(1996-2005년)의 평균 최저 해면기압은 979.2hPa로, 1970년대 10년간(1970-1979년)의 평균 최저해면기압 989.3hPa보다 10.1Pa이나 낮다. 상관분석에 의하여, 1970년 이후의 태풍 세기 강화는 남해 해수면온도의 상승과 상관이 있다는 사실을 확인하였다.

태풍 내습후 낙동강 하구 사주해안의 쓰레기 분포 (Distribution of Marine Debris collected from the Sandbar Coastline of Nakdong River Estuary after the Typhoons' Passage)

  • 박순;윤한삼
    • 해양환경안전학회지
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    • 제13권4호
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    • pp.1-7
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    • 2007
  • 본 연구는 최근 우리나라에 영향을 미친 태풍 우사기(USAGI)와 나리(NARI) 내습시 낙동강 진우도 해안쓰레기량을 조사하여 그의 양, 종류 및 구성 성분을 평가하고, 수치모형실험을 통한 태풍 내습 파랑분포와의 상관성을 비교하였다. 그 결과에 따르면, (1) 태풍 내습시 낙동강 하구 진우도 해안쓰레기는 $5,769/86kg/km^2/day$의 퇴적속도로 퇴적되는 것으로 산정되었다. 이는 평상시보다 약 14.42 배 많은 양이다. (2) 진우도 전면해역에서의 태풍 내습시 파고분포는 4.1-3.5m였으며, 진우도 전면해역이 도요등 전면해역보다 파고비가 약 1.0배에서 2.5배 상승하여, 파랑에너지의 집중도가 크고, 보다 많은 양의 부유물질(쓰레기)의 밀집이 예상된다.

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태풍 내습후 낙동강 하구 사주해안의 쓰레기 분포 (Distribution of Marine Debris collected from the Sandbar Coastline after the Passage of Typhoons, Nakdong River Estuary)

  • 박순;윤한삼
    • 해양환경안전학회:학술대회논문집
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    • 해양환경안전학회 2007년도 추계학술발표회
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    • pp.15-21
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    • 2007
  • 본 연구는 최근 우리나라에 영향을 미친 태풍 우사기(USAGI)와 나리 (NARl) 내습시 낙동강 진우도 해안쓰레기량을 조사하고 그 종류 및 구성 성분을 평가하고, 수치모형실험을 통한 태풍 내습 파랑분포와의 상관성을 비교하였다. 그 결과에 따르면, (1) 태풍 내습시 낙동강 하구 진우도 해안쓰레기의 퇴적량은 $5,769.86kg/day/km^2$의 해안쓰레기가 퇴적되는 것으로 산정되었다 이는 평상시보다. 약 14.42배 많은 양이다 (2) 진우도 전면해역에서의 태풍 내습시 파고분포는 4.1- 3.5m였으며, 진우도 전면해역이 도요등 전면해역보다 파고비가 약 1.0배에서 2.5배 상승하여, 파랑에너지의 집중도가 크고, 보다 많은 양의 부유물질(쓰레기)의 밀집이 예상된다.

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Estimation of the National Burden of Disease and Vulnerable Population Associated with Natural Disasters in Korea: Heavy Precipitation and Typhoon

  • Han, Hyun-Jin;Kim, Jong-Hun;Chung, Soo-Eun;Park, Jae-Hyun;Cheong, Hae-Kwan
    • Journal of Korean Medical Science
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    • 제33권49호
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    • pp.314.1-314.15
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    • 2018
  • Background: Despite its growing significance, studies on the burden of disease associated with natural disasters from the perspective of public health were few. This study aimed at estimating the national burden of disease associated with typhoons and torrential rains in Korea. Methods: During the period of 2002-2012, 11 typhoons and five torrential rains were selected. Mortality and morbidities were defined as accentual death, injury and injury-related infection, and mental health. Their incidences were estimated from National Health Insurance Service. Case-crossover design was used to define the disaster-related excess mortality and morbidity. Disability-adjusted life years (DALYs) were directly assessed from excess mortality and morbidity. Results: The burden of disease from typhoons increased with the intensity, with 107.7, 30.6, and 36.6 DALYs per 100,000 per event for strong, moderate, and weak typhoons, respectively. Burden of disease from torrential rains were 56.9, 52.8, and 26.4 DALYs per 100,000 per event for strong, moderate, and weak episodes, respectively. Mental disorders contributed more years lived with disability (YLDs) than did injuries in most cases, but the injury-induced YLDs associated with strong typhoon and torrential rain were higher than those of lower-intensity. The elderly was the most vulnerable to most types of disaster and storm intensities, and males younger than 65 years were more vulnerable to a strong torrential rain event. Conclusion: The intensity of torrential rain or typhoon was the strongest determinant of the burden of disease from natural disasters in Korea. Population vulnerable may vary depending on the nature and strength of the disasters.

A Three-Dimensional Numerical Study of Effects of Typhoons on Oceanographic Conditions in the Korea Strait

  • Hong, Chul-Hoon
    • Journal of the korean society of oceanography
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    • 제34권2호
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    • pp.73-85
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    • 1999
  • When typhoons passed around the Korea Strait, some observation in this strait carried out by Mizuno et al. (1986) gives us the following oceanographic features; 1) the direction of the observed current was opposite to the northeasterly wind, 2) temperature rapidly increased having a time lag as the depth deepens, after then decreased with oscillation. A primitive equation ocean model that makes use of a sigma-coordinate system and incorporates a typhoon model was used to examine the mechanism to generate these phenomena. The model region covers the East China Sea, the Yellow Sea, and a portion of the East Sea (Japan Sea). The model well reproduces the observed features, especially in temperature field, and clearly manifests how the above observed features happened. From early time when the typhoon was located in low latitude, an alongshore northward current in the west of Kyushu (hereafter the West Kyushu Current) is generated by an alongshore wind in the typhoon. This current flows into the eastern channel, as a coastal jet, regardless to the wind field within the Korea Strait during this period. The above observed phenomena are generated by this current. The model results indicate that when typhoons pass around the Korea Strait, the West Kyushu Current is generated, and oceanographic condition in the strait should be greatly influenced by this current.

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태풍에 의해 발생하는 한국근해 해황이상변동 (Abnormal Oceanic Conditions Caused by Typhoons Around the Korean Peninsula)

  • 서영상;구지영;황재동;이나경;김복기;장이현;강용균;이동인
    • 한국수산과학회지
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    • 제36권4호
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    • pp.417-429
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    • 2003
  • Abnormal oceanic conditions associated with the passage of typhoons are examined using hydrographic and satellite data 1990-2002. During the passage period of typhoons in the Korean waters, an abrupt decrease of sea surface temperature (SST) in range of 5 to $8^{\circ}C$ was observed. The areas of SST decrease were an order of 100-200 km, and the low SST lasted about 15-25 days after passage of typhoon. After passage of typhoon, the water temperatures in the surface mixed layer of 30 m show negative anomalies for quite a long period. In addition, stratification parameters were substantially decreased and chlorophyll a density was rapidly increased.

태풍통과시 3차원 원시모델을 이용한 녹산만 담수역의 시공간 변화특성 (Temporal and Spatial Variation in the Freshwater Region in Noksan Bay with the Passage of Typhoons Using the POM)

  • 홍철훈;박세영
    • 한국수산과학회지
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    • 제46권1호
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    • pp.59-69
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    • 2013
  • Temporal and spatial variation in the freshwater region, created by river runoff, of a small bay, caused by the passage of typhoons was examined using a three-dimensional primitive equation model (the Princeton Ocean Model, POM). Numerical experiments were implemented focusing on temporal evolution in the freshwater region in association with typhoon tracks. The model domain covered most of the estuary around the Nakdong River, including Noksan Bay, where river water is periodically released from upstream (Noksan dam). The model showed that the extension of the freshwater region outside of the bay depended strongly on the tracks of typhoons, specifically the associated wind directions and inner flow fields that are accompanied by new clockwise eddies. The model also showed that entrainment from typhoon passage frequently creates salt wedges in the estuary, indicating that organisms in the bay are biologically and chemically influenced with variation in the freshwater region.

1차원 모델상에서 태풍통과시의 혼합층 수온 변화 (Temperature Variations in the Mixed Layer with the Passage of Typhoons Using One-Dimensional Numerical Model)

  • 홍철훈;마스다 아키라
    • 한국수산과학회지
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    • 제51권1호
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    • pp.107-112
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    • 2018
  • One-dimensional numerical model is implemented to investigate temperature variations in the mixed layer depth (MLD) with the passage of typhoons. In the model, we assume a non-divergent, infinite ocean and consider wind effects only, excluding isostatic effects (inverse barometric effects) and upwelling with vertical movement of the water column. Numerical experiments investigate the effects of typhoon tracks on temperature variations, including their dependence on vertical resolutions in the MLD and these results are compared with those in a three-dimensional primitive equation model (POM). The model reproduces features of the observed temperature variations in the MLD fairly well, and implies that wind effects, rather than isostatic effects, play a predominant role in temporal and spatial temperature variations in the MLD. After the passage of typhoons, however, the model does not reproduce well the temperature variations observed in the MLD, because a limitation of the model is its inability to reproduce events such as cyclonic eddy formation (Hong et al., 2011; Masuda and Hong, 2011). The model also shows well the so called 'rightward bias' (Price, 1981) of sea surface cooling which is the most predominant in the right hand side of typhoon's track.

Abnormal oceanic conditions around the Korean peninsula caused by typhoons

  • Suh, Young-Sang;Gu, Ji-Young;Hwang, Jae-Dong;Lee, Na-Kyung;Jang, Lee-Hyun;Jeon, Kyoung-Ok
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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    • pp.640-641
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    • 2003
  • Abnormal oceanic conditions associated with the passage of typhoons are examined using hydrographic and satellite data 1990-2002. During the passage period of typhoons in the Korean waters, an abrupt decrease of sea surface temperature(SST) in range of 5 to 8 $^{\circ}$ was observed. The areas of SST decrease were an order of 100-200km, and the low SST lasted about 15-25 days after passage of typhoon. After passage of typhoon, the water temperatures in the surface mixed layer of 30m show negative anomalies for quite a long period. In addition, stratification parameters were substantially decreased and chlorophyll a density was rapidly increased.

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태풍 시뮬레이션을 통한 한반도 극한풍속 추정 (Estimation of Extreme Wind Speeds in Korean Peninsula using Typhoon Monte Carlo Simulation)

  • 이승수;김가영
    • 한국전산구조공학회논문집
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    • 제29권2호
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    • pp.141-148
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    • 2016
  • 국내 서해대교, 인천대교와 같은 장대교량은 대부분 빈번하게 태풍에 의해 영향을 받는 해안에 위치하였으며, 교량의 길이가 긴 만큼 풍하중에 의한 영향이 다른 하중에 비해 상대적으로 크기 때문에 내풍 안정성을 확보하기 위해 정확한 설계풍속을 산정하는 것이 매우 중요하다. 본 연구에서는 태풍의 기후학적 특성 인자로 중심기압깊이, 태풍이동속도, 태풍이동방향, 최단접근거리를 결정하였으며, 태풍의 기후학적 특성들의 확률 분포를 추정하고, 바람장 모형과 중심기압상승 모형을 적용하여 몬테카를로 시뮬레이션을 실시하였다. 분석결과, 대체적으로 제주도와 남해안 지역의 재현기간 풍속이 크게 나오며 고위도로 갈수록 작아지는 특징을 나타냈다. 이와 같은 특징이 나타난 가장 큰 원인은 고위도 분석지점 표본 태풍의 중심기압이 저위도 분석지점 표본 태풍의 중심기압보다 높기 때문으로 판단되며, 또한 우리나라에 해상에서 육지로 이동하면서 쇠퇴기를 겪어 점차 약해지기 때문인 것으로 분석되었다. 또한, 시뮬레이션 결과를 도로교 설계기준 100년 재현기간 풍속(10분 평균, 지상 10m, 지표조도 II)과 비교한 결과, 태풍시뮬레이션의 결과가 낮게 나타났으며, 이러한 점을 볼 때 도로교 설계기준의 기본 풍속이 높게 산정되어 있다고 판단되며, 기상자료 분석과 같은 추가적인 연구를 통해 기본풍속 조정에 대한 연구가 수행 되어야 할 것으로 사료된다.