• 한국환경과학회지
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• 제23권2호
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• pp.261-274
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• 2014

This work investigates the relationship between the sea breeze circulation and ozone concentrations during cold water events in the southeastern coastal area of the Korean Peninsula, where coastal upwelling frequently occur. This analysis was performed based on the classification of two categories, such as cold water and non-cold water events, over the period of 2000-2009. The low air temperature ($0.5^{\circ}C$), low SST ($5^{\circ}C$) and the wind direction(southerly) are the features of the cold water events in the Southeastern coastal area. Moreover, ozone concentrations in the cases of the sea breeze circulation and cold water events were significantly lower (below 30 ppb) than those (70~100 ppb) in the non-clod water events, because of the low air temperature ($10{\sim}20^{\circ}C$) and high wind speed (3~5 m/s) around the southeastern coastal area.

• 한국해양공학회지
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• 제21권2호
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• pp.35-41
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• 2007

In general, coastal damage is mostly occurred by the action of complex factors, like severe water waves. If the maximum storm surge height combines with high tide, severe water waves will overflow coastal structures. Consequently, it can be the cause of lost lives and severe property damage. In this study, using the numerical model, the storm surge was simulated to examine its fluctuation characteristics at the coast in front of Noksan industrial complex, Korea. Moreover, the shallow water wave is estimated by applying wind field, design water level considering storm surge height for typhoon Maemi to SWAN model. Under the condition of shallow water wave, obtained by the SWAN model, the wave overtopping rate for the dike in front of Noksan industrial complex is calculated a hydraulic model test. Finally, based on the calculated wave-overtopping rate, the inundation regime for Noksan industrial complex was predicted. And, numerically predicted inundation regimes and depths are compared with results in a field survey, and the results agree fairly well. Therefore, the inundation modelthis study is a useful tool for predicting inundation regime, due to the coastal flood of severe water wave.

• 해양환경안전학회지
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• 제18권1호
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• pp.15-24
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• 2012

동해연안의 수질특성 및 상태를 파악하기 위하여 2004년부터 2010년까지의 국가해양환경측정망 조사결과를 이용하여 수질인자의 거동을 분석하였다. 본 연구에서는 통계적 방법을 이용한 수질인자간의 상관관계 및 주성분 분석을 통하여 해역별 수질환경 특성을 파악하였으며, OECD의 부영양화 기준과 부영양도, 그리고 유기오염도 지수의 산정으로 해역별 오염상태를 평가하였다. 수질인자간의 주성분 분석에서 동해연안은 클로로필 a와 염분이 주요인자로 설명되는 2개의 요인으로 구분되었다. 해역별로는 죽변을 경계로 남부와 중부로 분류되었으며, 동해 중부 해역에서는 죽변, 그리고 남부해역에서는 감포연안이 별도로 분류되었다. 동해연안의 영양상태는 Oligotrophic~Mesotrophic 수준으로 구분되었으며, 부영양화도는 1 이하로 평가되었다. 유기오염지수는 동해연안 전 해역에서 양호한 수질상태로서 평가되었다.

• 한국환경과학회지
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• 제15권11호
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• pp.1017-1025
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• 2006

This study was conducted to evaluate characteristic of water duality in coastal sea of Incheon using a multivariate analysis. The analysis data in coastal sea of Incheon was aquired by the NFRDI data which was surveyed from March 1997 to November 2003. Eleven water quality parameters were determined on each survey The results were summarized as follow : Water quality in Incheon coastal sea could be explained up to 64.62% by three factors which were included in loading of fresh water and nutrients by the land(36.98%), seasonal variation(16.19%), and internal metabolism (11.24%). The results of time series analysis by factor score, in case of factor 1, station 1 influenced by Han river was shown to high factor score and station 3 located by outer sea was shown to low factor score. In case of factor 2, station 1 was appeared to high variation and station 3 was appeared to low variation. The result of cluster analysis by station was classified into three group that has different water quality characteristics. Especially, station 1 which affected by Han river and station 4 which affected by sewage treatment plant was appeared to considerable water quality characteristics against other station. In yearly cluster analysis, three group was classified and water quality in 2003 years due to high precipitation was different to another year. It could be suggested from these results that it is important to control discharge of fresh water by Han rivet and sewage treatment plant for water quality management of coastal sea of Incheon.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회(2)
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• pp.848-849
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• 2005

• 수산해양기술연구
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• 제59권4호
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• pp.315-327
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• 2023

In the last five decades, there has been a consistent decline in the total catch of fisheries in the Korean jurisdiction since the peak in 1986. The decline in catch slowed and slightly rebounded in the 2000s, but changed back to a decline in the 2010s. As indicators that can identify changes in the marine ecosystem, trophic level (TL), biodiversity index (H'), and the ratio between pelagic fish and demersal fish (P/D) were analyzed by each local marine ecosystem. There were some different changes in each local marine ecosystem, but the mean TL and H' decreased and P/D increased in general in Korean waters. Demersal fish, which were dominant in the 1970s and 1980s, declined, and small pelagic fish and cephalopods have dominantly changed since the 1990s. However, these changes are not simple, and they are fluctuating in complex ways relating to each marine ecosystem and the timing. It is believed that changes in marine ecosystems in Korean waters are likely caused by a combination of fisheries and climate change. The ecosystem indicators reflected a change in the total catch, a sharp drop in catch of demersal fish, and increasing catch of pelagic fish since the mid-1980s.

• Spatial Information Research
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• 제14권2호
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• pp.223-234
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• 2006

연안수질의 시공간적 분포특성을 살펴보기 위하여 1997년부터 2004년 사이에 우리나라 연안해역에서 측정된 수질자료(chlorophyll-a, pH, DO, COD, SS, dissolved inorganic nitrogen, dissolved inorganic phosphorous, salinity, temperature)에 대해 GIS 공간분석 기법을 적용하였다. 본 연구에서 사용된 수질자료는 공간상 모든 위치에 그 값이 존재하나, 실제 간의 수집은 고정관측 위치에서만 수행된다. 따라서 공간적으로 연속적으로 존재하는 연안수질의 분포 특성을 파악하기 위해서는 미관측 지점의 값을 예측할 필요가 있다. 본 논문에서는 공간분석 기법인 IDW를 연안수질 측정자료에 적용하였으며, IDW 기법의 적용 가능성을 평가하였다. 또한 IDW 공간보간을 적용한 후, 전국 연안을 46개 구간으로 구분하여 각 구간의 수질특성을 GIS 시각화 기법을 이용하여 분석하였다. 적용결과 공간보간 및 GIS 기법이 다년간 광범위한 범위에서 수집된 수질 자료로부터 시공간적 분포 특성을 파악하는데 유용함을 확인할 수 있었다.

• Journal of the korean society of oceanography
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• 제38권3호
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• pp.87-100
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• 2003

The monthly observations of hydrography in the Cheju Strait from September 1995 to June 1998 show that the Cheju Strait is occupied mostly by Tsushima Current Water in winter and coastal waters in summer. In summer, the Yangtze Coastal Water appears in the upper layer and cold water in the lower layer. Especially, the Yellow Sea Bottom Cold Water appears in August 1997, and the clockwise flow of warm water along the northwestern coasts of Cheju Island is disturbed by an eastward expansion of the cold water from the northwest. The cold water expansion seems to be partly associated with strong southeasterly winds. Current measurements in the Cheju Strait suggest that there exists steady eastward barotropic component of about 5 cm/sec, which corresponds to 0.2 Sv barotropic transport in the Cheju Strait. Geostropic transport (baroclinic component) ranges from 0.1 Sv in winter to 0.4 Sv in summer. By adding the barotrophic component of 0.2 Sv, the total transport varies from 0.3 Sv to 0.6 Sv, which is consistent with previous estimations. The transport increase in summer seems to be caused by the expansion of coastal water to the Cheju Strait.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회(1)
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• pp.463-464
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• 2005

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2005년도 학술발표회(1)
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• pp.824-825
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• 2005