• 환경생물
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• 제17권4호
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• pp.503-512
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• 1999

한반도와 일본에 서식하는 왕거머리말(Zostera asiatica Miki, Zosteraceae)의 서식 환경에 따른 형태적인 변이를 분석하기 위해 동해연안과 일본 훗카이도에 서식하는 왕거머리말의 식물체와 서식지의 해수 및 퇴적물을 채집 분석하였다. 본 조사를 통하여 왕거머리말은 한반도 지역에서는 수심 8.5∼10 m의 개방된 만과 외해의 영향을 직접 받는 지역에서 주로 서식하며, 동해연안의 공현진리, 동호리, 그리고 영동과 칠포 지역이 왕거머리말의 새로운 자생지로 확인되었다. 그러나 일본 홋카이도의 아케시만(Akkeshi Bay)에 있어서는 한반도와는 달리 1.5∼3m의 수심이 얕은 내만에서 서식하였다. 한반도 동해 연안에서 왕거머리말의 서식지 퇴적물의 입도는 모래로 구성되었다. 한반도 동해 연안의 집단에서는 식물체의 높이가 64.0∼75.7cm, 폭 11.0∼l5.0 mm로 나타났으나, 아케시만에 서식하는 식물체 집단의 높이 187∼234 cm, 폭은 18.0∼l8.7 mm로, 후자의 경우가 훨씬 큰 것으로 나타났다. 이러한 변이에 의해 규정된 한반도 동해연안의 집단간 그리고 일본 아케시만의 집단간핵 리보소옴 DNA의 ITS 염기서열 비교 분석에 의한 유전적 차이는 없는 것으로 나타났다.

• Fisheries and Aquatic Sciences
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• 제11권1호
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• pp.41-49
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• 2008

Internal waves and internal tides occur frequently along the eastern coast of Korea. During the spring-tide period in April 2003, the East Korean Warm Current (EKWC) flowed near the Korean East Coast Farming Forecast System (KECFFS; a moored oceanographic measurement system), creating a strong thermocline at the intermediate layer. Weakened stratification and well-mixed water appeared frequently around the KECFFS, with duration of approximately 1 day. The results suggest the following scenario. Baroclinic motion related to the internal tide generated high frequency internal waves around the thermocline. The breaking of those waves then created turbulence around the thermocline. After well-mixed water appeared, a current component with perpendicular direction to the EKWC appeared within the inertial period. The change in stratification around the KECFFS locally broke the geostrophic balance as a transient state. This local vertical mixing formed an ageostrophic current within the inertial period.

• 대기
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• 제32권2호
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• pp.135-148
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• 2022

This study investigates the influence of atmospheric river (AR) on precipitation over South Korea with a focus on regional characteristics. The 42-year-long catalog of ARs, which is obtained by applying the automatic AR detection algorithm to ERA5 reanalysis data and the insitu precipitation data recorded at 56 weather stations across the country are used to quantify their relationship. Approximately 51% of the climatological annual precipitation is associated with AR. The AR-related precipitation is most pronounced in summer by approximately 58%, while only limited fraction of precipitation (26%) is AR-related in winter. The heavy precipitation (> 30 mm day^-1) is more prone to AR activity (59%) than weak precipitation (5~30 mm day^-1; 33%) in all seasons. By grouping weather stations into the four sub-regions based on orography, it is found that the contribution of AR precipitation to the total is largest in the southern coast (57%) and smallest in the eastern coast (36%). Similar regional variations in AR precipitation fractions also occur in weak precipitation events. The regional contrast between the northern and southern stations is related to the seasonal variation of AR-frequency. In addition, the regional contrast between the western and eastern stations is partly modulated by the orographic forcing. The fractional contribution of AR to heavy precipitation exceeds 50% in all seasons, but this is true only in summer along the eastern coast. This result indicates that ARs play a critical role in heavy precipitation in South Korea, thus routine monitoring of ARs is needed for improving operational hydrometeorological forecasting.

• 지구물리
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• 제8권2호
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• pp.93-96
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• 2005

한반도 동해안에 지진해일 피해를 유발할 수 있는 일본서안지역에 대하여 지진활동도, 지진공백역, 해저단층연구와 같은 기존의 연구결과 및 지진해일 수치모형을 이용한 한반도 동해안 최대파고를 유발할 수 있는 단층해를 제시하였다. 지진정보가 없는 해저단층지역에 대해 지진해일 수치모형을 수행하여 한반도 동해안에 최대의 파고를 유발할 수 있는 단층해를 제시하였다. 특히 주향의 변화에 따라 같은 규모 지진이라도 생성할 수 있는 해안가에서의 해일의 높이는 7배 이상 차이가 날 수 있음을 알 수 있었다. 이 단층해를 이용하여 지역별, 규모별로 도달시간 및 최대해일고를 포함하는 지진해일 시나리오 DB를 구축하고 있으며 향후 기상청 국가지진분석시스템과 연계하여 지진해일 예측체계를 강화할 것이다

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2005년도 공동학술대회 논문집
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• pp.3-7
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• 2005

한반도 동해안에 지진해일 피해를 유발할 수 있는 일본서안지역에 대하여 지진활동도, 지진공백역, 해저단층연구와 같은 기존의 연구결과 및 지진해일 수치모형을 이용한 한반도 동해안 최대파고를 유발할 수 있는 단층해를 제시하였다. 지진정보가 없는 해저단층지역에 대해 지진해일 수치모형을 수행하여 한반도 동해안에 최대의 파고를 유발할 수 있는 단층해를 제시하였다. 특히 주향의 변화에 따라 같은 규모 지진이라도 생성할 수 있는 해안가에서의 해일의 높이는 7배 이상 차이가 날 수 있음을 알 수 있었다. 이 단층해를 이용하여 지역별, 규모별로 도달시간 및 최대해일고를 포함하는 지진해일 시나리오 DB를 구축하고 있으며 향후 기상청 국가지진분석시스템과 연계하여 지진해일 예측체계를 강화할 것이다.

• 한국환경과학회지
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• 제14권10호
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• pp.945-953
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• 2005

Daily time series of longshore sea surface temperature (SST) data at 3 stations, sea surface SST data at 58 stations in the eastern coast of the Korean Peninsular from 2001 to 2005 were used in order to study the temporal and spatial variations of the upwelling coastal cold water occurred in summer season. When the cold water occurred, SST has been decreased more than $-5^{\circ}C$ in a day. The cold water occurred frequently in the eastern coastal areas of Korea such as Ulgi, Kampo, Jukbyun. Daily variations of cold water temperature were quantified using remote control buoy system at Kijang in the southeastern coastal water from July to August in 2004. Hourly variations of SST occurred around $\pm3^{\circ}C$ when cold water disappeared at Kijang. There were close relationship between the strength of East Korean Warm Current, North Korean Cold Water and the scale of spatio-temporal cold water variations in summer season.

• 물과 미래
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• 제16권4호
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• pp.253-257
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• 1983

In an attempt to study the frequency and characteristics of typhoons which hit the Korean Peninsula a period of 40 years from 1946 through 1979 was covered to collect necessary data with respect to occurrence of typhoons and their influence Typhoons which occurred between 1959 and 1980 were grouped according to their treking routes and strengths for detailed analyses. The results are summarized as follow; 1. The average annual occurrence of typhoons in the western pacific ocean was found to be 28, only two of which attacked the Korean Peninsula. 2. The annual probabilities of typhoons attacking were 0.925 for one or more, 0.700 for twice or more and 0.323 for there times or moro. 3. The monthly probabilities were found to be 0.228 in July, 0.434 in August and 0.194 in September. 4. An half of the typhoons which hit the Korean Pennisula passed through the western coast and the rest through the southern and eastern coasts in similan proportions. 5. The western coast is hit most frequently in July and less afterwords, visa-vis the southern and the eastern coast. 6. The minimum SLP averaged 983 mb and ordered by the treking routes as S

• Ocean and Polar Research
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• 제31권1호
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• pp.111-119
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• 2009

Biogenic surface films, which are often present in coastal areas, may enhance the signatures of hydrodynamic processes in microwave, optical, and infrared imagery. We analyzed ERS-1/2 Synthetic Aperture Radar (SAR) and Envisat Advanced Synthetic Aperture Radar (ASAR) images taken over the Japan/East Sea (JES). We focused on the appearance of the contrast SAR signatures, particularly the dark features of different scales caused by various oceanic and atmospheric phenomena. Spiral eddies of different scales were detected through surface film patterns both near the coast and in the open regions of the JES in warm and cold seasons. During field experiments carried out at the Pacific Oceanological Institute (POI) Marine Station 'Cape Shults' in Peter the Great Bay, the sea surface roughness characteristics were measured during the day and night using a developed polarization spectrophotometer and various digital cameras and systems of floats. The velocity of natural and artificial slicks was estimated using video and ADCP time series of tracers deployed on the sea surface. The slopes of gravity-capillary wave power spectra varied between .4 and .5. Surface currents in the natural and artificial slicks increased with the distance from the coast, varying between 4 and 40 cm/s. The contrast of biogenic and anthropogenic slicks detected on vertical and horizontal polarization images against the background varied over a wide range. SAR images and ancillary satellite and field data were processed and analyzed using specialized GIS for marine coastal areas.

• 한국균학회지
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• 제41권3호
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• pp.185-191
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• 2013

국내 자연환경으로부터 다양한 효모들을 분리, 동정하고 나아가 이들로부터 유용물질을 생산하는 효모자원을 확보하기 위한 연구의 일환으로 우리나라 동해안, 서해안, 남해안에 서식하는 야생화들을 채집하여 이들로부터 효모들을 분리한 후 분자생물학적 방법으로 동정하였다. 동해시에서 수집한 야생화로부터는 Candida silvae 등을 포함한 15종에 속하는 27균주의 효모들을 분리하였다. 서해안의 대천시 해수욕장 주위 야생화에서는 Bulleromyces albus를 비롯한 17종 34균주가 분리, 동정되었다. 또한 남해안의 완도군 대문리 주위의 야생화들로부터는 Cryptococcus flavus를 포함하여 13종에 속하는 효모 22 균주들이 분리 동정되었다. 전체적으로 우리나라 동해안, 서해안, 남해안의 야생화로부터 모두 45종에 속하는 효모들 83균주를 분리, 동정하였다.

• Ocean and Polar Research
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• 제24권1호
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• pp.55-61
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• 2002

Eelgrass, Zostera marina L. widely spreads throughout all the coastal areas of the Korean Peninsula. However, some previously reported eelgrass populations disappeared. The disappearance was probably caused by anthropogenic disturbance such as reclamation and pollutant or exceeded nutrient release. Eelgrass beds occurred from the intertidal to the subtidal zone, mainly in lagoon, estuaries, ports, barrier reef and bays. Eelgrass beds were also found at the intertidal mud and sand flats, subtidal mud and sandbank in more exposed areas. Habitat characteristics of eelgrass beds distributed on the coasts of the Korean Peninsula varied among coast areas. Eelgrass distributed constantly throughout the southern coast of Korea, while the distribution was limited at lagoon, bay, port, or barrier reef on the eastern coast, because of steep water depth and high wave energy in that coast. On the western coast, eelgrass mainly appeared at the intertidal and subtidal zones in islands. Sediment characteristics of the Z. marina beds varied with locality, tidal current and water motion. Sediments of Z. marina beds were composed of sand, muddy sand, sandy mud and mud. Mean grain size ranged from 1.5 to 4.1 phi.