• 대한지리학회지
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• 제33권2호
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• pp.143-163
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• 1998

In order to clarify the depositional environment and sea-level change at Ilsan area including Gawaji and Saemal valley plains, which is located at the right side in downstream of the Han River, boring data, radiocabon dating and diatom analysis were comprehensively investigated. As a result, the palaeogeographies fo this area altered by the transgressions and regressions after 7,000 y. BP could be restored. The high tide sea-level(mean high water level of spring tide) was arrived ca. 7,000y. BP at the valley plain and risen to ca. 5.5m at ca. 5000y. BP. Since then, the sea-level was kept up the same level to ca. 3,200 BP. The descended sea-level to ca. 2,300 BP was risen up to ca. 5.8m in ca. 1,800 y. BP. It is presumed that such a sea-level change as well as the different sediments in quantity supplied from the river basin of the valley plain could be effected to change diversely the depositional environment of the study area and eventually to the prehistoric human life.

• 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.

• 한국수산과학회지
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• 제44권5호
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• pp.506-515
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• 2011

To elucidate demersal organism community structure, abundance, and biomass by period and region in the Uljin marine ranching area, otter trawl surveys were conducted at six stations from February 2008 to December 2009. During the survey period, a total of 118 species was collected in the Uljin marine ranching area, including 76 pisces, 27 mollusca and 15 crustaceans. The average abundance of individuals was 806 ind./$m^2$ and average biomass was 31,853 g/m2. The numbers of species, species richness, individuals per area and biomass per area were higher in 2009 than in 2008. Cluster and MDS analysis, based on a Bray-Curtis similarity matrix of fourth root transformed data of number of species and individuals per area, showed division into two different groups of demersal organisms in 2008 (Group 1) and one demersal organism community in 2009 (Group 2). From cluster and MDS analysis using the similarity of the demersal community among six stations, the Uljin marine ranching area was divided into Group A (St. 2, St. 4, St. 5 and St. 6) and Group B (St. 1 and St. 3).

• 해양환경안전학회지
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• 제10권1호
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• pp.35-40
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• 2004

선박은 물을 떠날 수 없고, 항로의 자연환경에 따라 항행해야 하기 때문에 항행하는 해역환경에 의하여 선박의 특성이 결정된다. 중국의 남방과 북방의 해역은 상이한 특징을 가지고 있다. 즉 남방의 해역은 수심이 갚고, 북방의 해역은 수심이 얕다. 중국의 조선기술은 이러한 해역특성에 적응하여 상이한 선형이 발명, 발전되었다.

• 한국대기환경학회지
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• 제24권2호
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• pp.259-270
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• 2008

The regional air movement in a coastal area is generated by the different heat capacities of sea and land sides, which is called sea/land breeze. In the west coast area, the local air quality is significantly influenced by this sea/land breeze. In this study, the mathematical model is proposed to estimate the effective area of sea/land breeze. A commercial air model, that is suggested as an alternative air model by USEPA, is introduced to simulate the mechanism of sea/land breeze generation. From this study, it is confirmed that the numerical approach proposed in this study is reliable to predict the effective area of sea breeze in a coastal area. It implies that the current application of common air model needs to be carefully reviewed especially when dealing with a coastal air quality issue. It is also found that the sea breeze in Incheon area has the impact in the range of approximately 24 km in-land side, so-called penetration length.

• 해양환경안전학회지
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• 제5권2호
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• pp.125-139
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• 1999

Thanks to the fact that the 1953 Korea Armistice Agreement does not have any clear provisions on the sea demarcation line, the North Korea insists that the sea demarcation line in the Yellow Sea Area should not be the NLL designated by the Commander in Chief. UN Command, unilaterally, but the hypothetical extention of the Latitude Parallel from the end of the provincial boundary line between Whanghae-do and Kyongki-do In those unique situations at the end of the Korean War, the cease-fire line on the part of the western sea area, a logically indispensable element of the contents of an armistice agreement, however has formed and crystallized by the act of the UN Command designating the NLL. In implementing the South-North Korean Basic Relations Agreement, a fair and clear common consent on the sea demarcation line in the western sea area should be deliberated.

• 해양환경안전학회지
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• 제24권6호
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• pp.726-734
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• 2018

최근 3년간 검토된 환경관리해역에서 이루어진 해역이용협의 건수는 총 60건으로 조사되었다. 환경보전해역에서는 지속적으로 감소하였고, 특별관리해역에서는 증가하는 양상을 나타내었다. 환경관리해역의 개별사업유형을 분석한 결과 인공구조물 설치사업이 가장 높은 비율을 차지하였고, 그 외 항만 어항개발, 연안정비 및 해수 인 배수사업유형이 많이 이루어졌다. 환경관리해역에서 국가해양환경정보통합시스템(MEIS) 자료를 활용하여 2006~2017년까지 경년별 수질변화경향을 비교한 결과, COD는 뚜렷한 증감의 변화는 보이지 않았으나 환경보전지역은 다소 증가하였으며, TN과 TP의 농도는 다소 감소하는 경향을 보였다. 특별관리해역인 광양만과 마산만 및 환경보전해역인 가막만에서는 주로 하계에 빈산소수괴가 출현하였다. 이러한 환경관리해역에서의 이용 개발행위가 지속적으로 이루어지고 있으므로, 이에 따른 해양환경부문 환경영향평가(해역이용협의)시에는 충분한 수질변화에 대한 실태분석 및 사업추진에 따른 수질영향과 퇴적물의 오염상태를 철저히 진단해서 오염원관리에 대한 대책이 중점적으로 평가되어야 할 것으로 판단된다. 특히, 각 환경관리해역의 지정 목적에 따른 유지 수질목표를 명확히 설정하여, 오염원 및 연안오염총량관리와 연계하여 오염 부하량 저감대책을 제시하여야 할 것이다.

• 한국대기환경학회지
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• 제20권3호
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• pp.345-360
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• 2004

The late sea-breeze and its impacts on ozone distributions were investigated during April to September from 1998 to 2002, in the Busan metropolitan area (including surrounding areas) using the surface ozone concentrations (obtained at 9 monitoring sites), local meteorological variables (obtained near the shore), together with synoptic data. The urban scale ozone concentration was also simulated using the MM5/UAM-V to better understand the role of late sea-breeze in Busan. The results from observation study showed that most of the late sea-breeze occurred when weak offshore synoptic flow (northwesterly) suppressed development of sea - breeze, and the ozone concentration level and frequencies exceeding ozone standard increased with the onset time of sea breeze. We also found that the late sea-breeze clearly induces relatively weak wind speed and high temperature during the daytime As a result it enhances the photochemical ozone accumulation and delays the occurrence time of the averaged maximum ozone concentrations. The results of simulation for high ozone episode (24 August, 2001) by MM5/UAM -V revealed that the late sea-breeze interacted with weak offshore synoptic wind can contribute significantly to high ozone concentration in the coastal urban area. The simulated horizontal and vertical distribution of ozone concentration indicated that ozone can be accumulated over the sea under stagnant condition and return to the land in the late afternoon with the sea breeze, suggesting both the relationship between late sea-breeze and recirculation and the importance of late sea -breeze effects influencing severe ozone pollution in Busan.

• 한국대기환경학회지
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• 제20권1호
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• pp.1-15
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• 2004

Sea/land circulation system is a representative mesoscale local circulation system in coastal area. In this study, wind fields around coastal area. Pohang, which is affected by this system was investigated and its detailed characteristic analysis was carried out. The following can be found out from the numerical simulation. Generally, at nighttime mountain winds prevail and land breeze toward the coastal area was well simulated During daytime, valley wind and sea breeze was simulated in detail. Especially, as a result of analyzing the land breeze path, it could be found along the coastline as it flows out through low land coastal area. In order to investigate the accuracy of model results. wind speed, temperature and wind direction of continuous typical sea/land breeze occurrence day was compared with observation data. Analyzing the characteristics of local circulation system was very hard because of horizontally sparse observation data but from the above result, a numerical simulation using RAMS, which satisfies the spatial high resolution, will provide more accurate results.

• 한국환경과학회지
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• 제22권10호
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• pp.1363-1371
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• 2013

In this study, we estimate the interannual spatial and temporal distributions of fishing grounds at night in the East Sea based on satellite and in-situ data. We observe that the $15^{\circ}C$ thermal front moves in the north-south direction according to the movement of the warm water (above $18^{\circ}C$) in the Tsushima Warm Current (TWC) area, forcing the cold water area (below $10^{\circ}C$) to either expand or shrink. The interannual variations of sea surface temperature (SST) in winter represented by the indicator SST of $6^{\circ}C$ are consistent with the east-west zonal areas in the central East Sea which represented over $1^{\circ}C$ standard deviation of SST in February during 1990-2000. Annual SST in the fishing grounds of common squid fishing vessels, observed both by fishing vessels and satellites range from 9-$22^{\circ}C$, with the satellite-observed data having a larger range than the fishing vessel-based ones. The interannual distributions of the common squid fishing grounds in the East Sea are mostly concentrated in the TWC area in the southwestern part of the East Sea and in the coast of southern Honshu and Hokkaido in Japan. The interannual distributions of the nighttime fishing vessels are consistent with the catches investigated from the fishing vessel.