• Korean Journal of Remote Sensing
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• v.17 no.3
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• pp.219-230
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• 2001

The daytime and nighttime sea surface temperature (SST) differences and their seasonal variabilities in the East Sea were studied using Argos drifters data during 1996~1999. The SST differences for 1,438 data set were derived from 30 Argos drifters related to the NOAA satellite-based location and data collection system. The horizontal variation of SST differences in summer in the East Sea were higher than those in winter. The relationship between the SST differences and the half day moving distances of Argos drifters was studied. Monthly SST difference in the northern and southern part of 38$^{\circ}$N in the East Sea was considered. The SST differences derived from NOAA-14 satellite were compared with those from Argos drifter between daytime and nighttime in the turbulent eddy off Wonsan coast of Korea.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.8 no.3
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• pp.274-284
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• 2003

The analysis of wave parametric characteristics in sea regions in the vicinity of Korean Peninsula have been carried out using the third generation wave model, WAVEWATCH-III (Tolman, 1999) and four observed buoy data of Korea Meteorological Administration (KMA). Significant wave height increases about 2-3 hours later after the increase of wind speed. Maximum correlation coefficient between two parameters appears in Donghae buoy data, which is at off-shore region. When land breeze occurs, it can be found that the correlation coefficient decreases. Time differences between wind speeds and wave heights correspond to significant tidal periods at all of the buoy locations except for Donghae buoy. After verifying the WAVEWATCH-III model results by the comparing with observed buoy data, we have carried out numerical experiments near the Kuroshio current and East Sea areas, and then reconfirmed that when there exist an opposite strong current in the propagation direction of the waves or wind direction, wave height and length get higher and shorter, respectively and vice versa. It has been shown that these modulations of wave parameters are considerable when wind speed is week or mean current is relatively strong, and corresponding values have been represented.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2021.11a
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• pp.221-223
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• 2021

풍랑특보는 우리나라 부근을 항행하는 선박 및 해상 업무 종사자에게 큰 영향을 미친다. 이 연구에서는 최근 11년(2010-2020년) 동안 기상청에서 발표한 서해·남해·동해의 앞바다 및 먼바다, 제주도 앞바다의 풍랑특보와 주요 해양기상부이의 관측자료를 비교·분석하여 풍랑특보의 적절성을 평가하였다. 각 해역에 대한 풍랑특보와 해양기상부이 관측자료를 일별, 월별, 연별로 통계를 내어 연평균, 월평균, 계절별로 비교한 결과, 풍랑특보의 적중률이 전 해역에 걸쳐 매우 낮은 것으로 분석되었다. 해상에서의 풍랑특보가 어선의 어업활동, 여객선 운항 및 관광, 해상 레저활동 등에 미치는 영향을 고려할 때 해양기상 예·특보의 정확성을 개선할 필요가 있음을 확인하였다.

• Journal of Advanced Marine Engineering and Technology
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• v.33 no.1
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• pp.166-174
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• 2009

Gijang Sea is located on the southeastern coast of Korea. This study establishes a basic system to identify optimal sites for the wave power generation. To achieve this goal, the field measurements were made at the field site in front of Dong-am fishing port at Gijang. In addition, we analyzed the offshore wave data at the Donghae buoy operated by Korea Meteorological Administration(KMA) and compared the data with the wave characteristics in Gijang Sea. The main results were as follows. In winter, the wave direction in Gijang Sea ranged between east and south($90{\sim}180^{\circ}$). The main wave direction was east($90^{\circ}$). The Significant wave heights and periods were under 2 m and $5{\sim}15$ sec, respectively. A comparison of water depth and wave direction constitutes one(condition) of the important parameters for selecting the optimal site for the wave power generation.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.10a
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• pp.47-50
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• 2003

대문어(Parotopus dofleini)는 한국 동해안에서 외줄낚시와 통발로 어획되고 있다. 이중 대문어 외줄낚시어업은 강원도를 중심으로 3톤 내외의 소형어선 1,500여척에 의해 연간4천여톤씩 어획되고 있어 동해 북부 어업인들의 주 소득원이 되는 어업 중 하나 이다. 해상에서의 조업방법은 일출 무렵에 출항하여 낚시가 해저바닥에 닿도록 부이줄을 조정하여 50여개의 어구를 수중에 투하한 후 선상에서 육안으로 부이의 상태를 관찰한다. (중략)

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.421-424
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• 2004

한국 동해시 연안역에서 2001년 6월, 2003년 5월 및 2004년 5월 해상실험 및 실시간 모니터링 부이 시스템을 통해 수집된 해양관측(수온, 유속)자료와 SAR (Synthetic Aperture Radar)위성영상을 분석한 내부파의 물리적 특성을 정리하였다. 이를 토대로 음파전달 모델(RAM)을 통해 내부파에 의한 음파전달 영향을 파악하고, 음도파관 불변 이른(Waveguide invariant theory)을 적용하여 내부파에 의한 해양 변동성을 음향학적으로 정량화 하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.476-476
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• 2016

근래 들어 우리나라 동해안에서 이상고파라 불리는 너울성 고파가 자주 발생하여 상당한 인명 피해를 야기하는 등 사회적으로 큰 이슈가 되고 있다. 이상고파는 일반적으로 동해상에서 발달한 강한 저기압에 의해 발생한 고파가 상대적으로 주기가 긴 너울의 특성을 띄며 우리나라 연안에 도달하여 피해를 발생시키는 것으로 알려져 있으며, 연안에 해상상태가 잦아지는 상황에서 갑작스럽게 전파되어 오기 때문에 많은 인명피해가 발생하게 된다. 현재 미국 등의 해양예보 선진국들은 파랑모델을 운용하여 너울을 포함한 파랑예보를 수행하고 있으며, 해상부이 등의 다양한 파랑관측을 통해 그 성능을 향상시키고 있다. 우리나라에서도 선진 해양예보시스템을 활용하여 이상고파를 예측하고자 하는 연구의 필요성이 제기되고 있으며 정부 관련 부처를 중심으로 그에 대한 연구가 점차 진행되고 있다. 본 연구에서는 파랑모델을 활용하여 기존에 발생한 이상고파 피해사례에 대한 후측모의를 수행하고 우리나라에서 발생하는 이상고파의 발달과정을 분석하였다. 또한, 파랑모델의 후측모의 결과를 관측자료와 비교하여 모델의 성능을 검증하고 문제점을 분석하였다.

• Journal of Navigation and Port Research
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• v.46 no.1
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• pp.11-17
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• 2022

The high wind wave alert has a great impact on ships and maritime service workers navigating in the vicinity of Korea. This study aims to evaluate the appropriateness of the high wind wave alert by comparing and analyzing the observation data of major marine meteorological buoys with the high wind wave alerts in the coastal sea and offshore of the West Sea, South Sea, and the East Sea announced by the Korea Meteorological Administration for the past 11 years(2010-2020). As a result of comparing the daily, monthly, and annual statistics of the high wind wave alert and marine meteorological buoy observation data for each sea area by annual, monthly, and seasonal average, the accuracy of high wind wave alerts was very low across the entire sea area. In particular, it was analyzed that the accuracy in the coastal sea of the South Sea and Jejudo was the lowest in winter. It was confirmed that the accuracy of marine weather forecasts and alerts needs to be improved when considering the effects of the high wind wave alerts on fishing vessels, passenger ships operations and tourism, and marine leisure activities.

• Journal of the Korean Society of Marine Environment & Safety
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• v.22 no.5
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• pp.508-520
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• 2016

In this study, variations in water temperature after the passage of typhoons in Korean waters from 2009-2015 were analyzed. Sea surface temperature (SST) images derived from satellite remote sensing data were used, and water temperature information came from real-time mooring buoys at Yangyang, Gangneung, Samcheok and Yeoungdeok, while wind data was supplied by the Korea Meteorological Administration. Differences in SST observed before and after the passage of a typhoon using the SST images were found to be affected by wind direction as well as hot and cool seasonal tendencies. Coastal water temperatures of the eastern part of the Korean peninsula, located to the right of a typhoon, as in the case of typhoons Muifa, Chanhom, Nakri and Tembin, were lowered by a coastal upwelling system from southerly winds across the water's surface at depths of 15m and 25m. In particular, typhoons Chanhom and Tembin decreased water temperatures by about $8-11^{\circ}C$ and $16^{\circ}C$, respectively. However, temperatures to the left of the typhoons were increased by a downwelling of offshore seawater with a high temperature through the mid and lower seawater layers. After the passage of the typhoons, further mixing of seawater at a higher or lower temperature due to southerly or northerly winds, according to the context, lasted for 1-2 or 4 days, respectively.

• Journal of the Korean earth science society
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• v.25 no.7
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• pp.629-636
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• 2004

In order to study developments of the marine atmosphere boundary layer in cloud incoming, important parameters like heat advection, surface layer heat flux, and radiation energy were estimated using the rawinsonde, AWS data, satellite images, and buoy data which was installed at the East Sea. We explained the variation and the development of mixed layer in terms of surface layer heat flux and long wave radiation under the cloudy sky. The heat flux was obtained by means of the bulk method. Conservation of heat was analysed by heat budget equation, which was consist of buoy data in the East sea, and sounding data at Ulleungdo and at Pohang. During the inflow of cloud, radiative cooling at the surface after was suppressed and long wave radiation from cloud played a role of warming. The surface layer temperature was also remained warm by influence of warm advection from south-easterly direction. The air temperature in night was increased, as a result, mixed layer was not destroyed and The nocturnal boundary layer was composed of the mixed layer and the residual layer.