• Korean Journal of Ichthyology
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• v.31 no.2
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• pp.77-82
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• 2019

The feeding habits of pacific cod (Gadus macrocephalus) were studied by analyses of stomach contents. Specimens of G. macrocephalus (n=407) were collected from the western coastal waters of Korea, monthly from July 2017 to June 2018. The size of G. macrocephalus ranged from 30.4 to 86.0 cm in total length (TL). G. macrocephalus was consumed mainly Pisces (71.5%) and Caridea (24.2%) based on % IRI, whereas other prey items including, Paguroidea, Euphausiacea and Cephalopods showed a low contribution to the diet. The feeding ratio of Caridea decreased with increasing fish size. While this decrease paralleled the increased consumption of fish preys. The feeding ratios of Pisces were the highest during spring, autumn and winter, whereas the proportion of Caridea was higher in summer.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.55 no.3
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• pp.243-251
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• 2019

The ichthyoplanktons were sampled by Bongo net to study the distribution of the eggs and larvae in the West coastal waters of Korea during the study period (February, May, August and October of 2017). Collected fish eggs were divided into Engraulis japonicus and unidentified species. The most dominant species, Engraulis japonicus accounted for 79.52% of the total fish egg, which was followed by unidentified species (20.48%). The total of 36 taxa in fish larvae were identified based on morphological and molecular characteristics. Fish larvae were dominant by Gobiidae species. 48.30% of the total catch in abundance, which was followed by Engraulis japonicus (31.86%). These two taxa composed 80.16% of the total collected fish larvae. The seasonal diversity index of species from the collected fish larvae in the West coastal waters in 2017 was 0.625-1.883 and the evenness index was 0.380-0.865. In addition, dominance index was 0.618-0.920 and richness was 0.573-3.189.

• Korean Journal of Ichthyology
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• v.33 no.4
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• pp.273-277
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• 2021

The feeding habits of the pointhead flounder, Cleisthenes pinetorum were studied in the West Sea in Korea. The samples were investigated using 360 specimens (21.7~48.1 cm in total length) collected by gill net of the coastal waters from January to December 2019. As a result, C. pinetorum consumed mainly Ophiuroidea and Pisces, but also ate small amounts of Macrura, Echinodermata, Amphipoda and Brachyura. The results of this study showed a difference with those of main feed habits of C. pinetorum caught in the coastal waters of Kori (Huh and Baeck, 2003). The proportion of fishes in prey items increased with size-related while that of Ophiuroidea decreased. As total length of C. pinetorum increased the mean number of preys per stomach (mN/ST) and weight of prey per stomach (mW/ST) tended to increase.

• 한국신재생에너지학회:학술대회논문집
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• 2005.11a
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• pp.342-350
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• 2005

우리나라 서해안 중부, 경기만 일대는 강한 조석과 잘 발달된 해만으로 인해 천혜의 조력자원 보고로 알려져 있으나, 1980년대부터 서 남해 연안역에 대한 대규모 매립과 항만개발 등으로 조력개발입지 자체가 상실되고, 조석체계도 변화되고 있다. 한편 조력에너지는 기존의 화석연료를 대체할 수 있는 개발가능한 신 재생 에너지 중에서 거의 유일하게 대규모로 개발이 가능한 것으로 평가되고 있어 개발시 기대효과는 매우 클 것이다. 이에 우리나라 서해안의 조력자원 부존량을 파악하고 주요 후보지에 대한 개발타당성 검토를 통하여 주요 조력자원 후보지를 타 개발로부터 보호하고, 민간참여를 유도하여 조력에너지 개발을 활성화하고자 본 조사를 추진하였다. 한반도 조력자원 개발타당성 검토를 위하여 1) 서해안의 주요 지점에 대한 조석특성을 조사하였고, 2) 주요 조력자원 후보지 위치 및 영역을 설정하였으며, 3) 조석체계변화예측 수치모형실험을 실시하였고, 4) 후보지별 발전소 평면배치계획을 수립하였으며, 5) 후보지별 연간발전량과 개략공사비를 산출하여 6) 후보지별 개략타당성 검토를 수행하였다. 검토결과 우리나라 서해안의 조력개발 가능규모는 215만kW 정도이며, 주요 후보지를 모두 개발할 경우 연간 3,826GWh의 전기를 생산할 수 있을 것으로 조사되었다. 또한 연간발전량 대비 순공사비 비율에 따르면 만 입구가 좁아 개발 경제성 확보가 유리한 가로림만을 우선 추진하고, 이후 인천만, 천수만 순으로 개발하는 것이 유리한 것으로 나타났다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.26 no.3
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• pp.120-130
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• 2014

Change of mean sea level in the western coast of Korean peninsula was estimated with the observed tide data of the KHOA. The cause of the change was investigated. Mean sea levels in the western coast have been changed due to coastal development projects in the coastal zone. The estimated variations, which are significantly different regionally, vary from -6.8 cm in Incheon to 38 cm in Gunsan. The changing rate of mean sea level occurred by natural factors such as global warming varies from 1.1 mm/year in the north to 4.4 mm/year in the south of western coast of Korean peninsula. In Jeju, sea level rise and rise of sea temperature showed a close relationship. Water temperature rise of one degree increases mean sea level to 0.6 mm in Jeju. Rising rate of mean sea level has increased rapidly after the mid-1980s.

• Journal of Marine Life Science
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• v.5 no.2
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• pp.43-50
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• 2020

The aim of this study is toxicity assessment using two types of sea urchins (H. pulcherrimus, M. nudus) that can representative primary consumers in potential coastal environments pollutants, Zinc undecylenate (ZU), which is used for various purposes, such as pharmaceutical agents and anti-bacterial and anti-fungi. The Fertilization rate and normal embryogenesis rate of H. pulcherrimus and M. nudus were concentration-dependent decreased. Besides, EC₅₀ of fertilization rate with H. pulcherrimus and M. nudus were 11.27 mgl^-1 and 1.48 mgl^-1, and EC₅₀ of normal embryogenesis were 0.94 mgl^-1 and 3.78 mgl^-1. NOEC of normal embryogenesis were 0.20 and 0.78 mgl^-1, respectively. In addition, to find the safety criteria of the ZU on the marine environment. PNEC value was 0.0094 mgl^-1, calculated using the toxicity values of two species of sea urchin derived from this study and the acute toxicity results of the coastal area through literature research. The above results will be used as basic data for establishing environmental protection strategies for marine environmental pollutants.

• The Korean Journal of Malacology
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• v.28 no.3
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• pp.225-232
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• 2012

In order to evaluate the relationship of between the contents of inorganic elements in shellfish and surface sediments, we measured the concentration of inorganic elements (As, Ca, Cd, Cr, Fe, Hg, Li, Mn, Ni, P, Pb, Zn) in various shellfish and surface sediments of research area. The enrichment factor (EF) and the index of accumulation rate (Igeo) of the metals showed that the research areas can be classified as moderately polluted, or unpolluted. And also we measured the geochemical characteristics of surface sediments(grain size, chemical oxygen demand (COD), ignition loss (IL) and acid volatile sulfide (AVS). The grain sizes for research areas of surface sediment were similar the ratio of silt and clay in comparison with other sites. The COD and IL in surface sediment ranged from 5.41 to 14.06 mg/g. d.w. (mean $8.78{\pm}3.16$ mg/g d.w.) and from 0.92 to 3.17% (mean $2.08{\pm}0.86%$), respectively. Siginificant differences in metal concentrations also were determinated in the shellfish tissue among the different sites. However, except for metals(Mn, Zn), which showed some elevation of concentrations, the variations in the shellfish tissue were not related to variations in the sediment.

• Journal of the Korean earth science society
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• v.39 no.6
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• pp.555-567
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• 2018

In order to identify the characteristics of sea surface temperature (SST) differences between microwave SST from GCOM-W1/AMSR2 and in-situ measurements in the western coast of Korea, a total of 6,457 collocated matchup data were produced using the in-situ temperature measurements from marine buoy stations (Deokjeokdo, Chilbaldo, and Oeyeondo) from July 2012 to December 2017. The accuracy of satellite microwave SSTs was presented by comparing the ocean buoy data of Deokjeokdo, Chilbaldo, and Oeyeondo stations with the AMSR2 SST data more than five years. The SST differences between the microwave SST and the in-situ temperature measurements showed some dependence on environmental factors, such as wind speed and water temperature. The AMSR2 SSTs were tended to be higher than the in-situ temperature measurements during the daytime when the wind speed was low ($<6ms^{-1}$). On the other hand, they showed positive deviation increasingly as the wind speed increased for nighttime. In addition, increasing tendency of SST differences was related to decreasing sensitivity of microwave sensors at low temperatures and data contamination by land. A monthly analysis of the SST difference showed that unlike the previous trend, which was known to be the largest in winter when strong winds were blowing, the SST difference was largest in summer in Deokjeokdo and Chilbaldo buoy stations. This seemed to be induced by differential tidal mixing at the collocated matchup points. This study presented problems and limitations of the use of microwave SSTs with high contribution to the SST composites in the western coastal region off the Korean peninsula.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2002.04a
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• pp.219-228
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• 2002

Because western sea on the shore development is threatening sea ecosystem by decrease of silt and large size land-reclamation work by industrialization causes surrounding weather change and sea change, generate much changes bottom of the sea topography and coastline. Also, is influencing to route for safe entry into port of ship, departure. Therefore, this research did 0m boundary line, anxiety 2m line which appear to coastline of land portion and the border of silt using sea base level of lowest low tone side that is base line that appear because of sea waves to basis data numerical value Tuesday, numerical value by divide drawing that is changed to 4 area and analyze change degree of new airport construction and new town development, seashore by western sea district along the coast development of tide embankment construction and so on and bottom of the sea recognize.

• Proceedings of the KSRS Conference
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• 2009.03a
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• pp.155-158
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• 2009

본 논문에서는 DLR(German Aerospace Center)에서 운영하는 TerraSAR-X를 이용하여 2009년 1월 19일 18:28 (Local time) 에 서해 대부도/제부도 및 대부도 남쪽 해안을 촬영한 stripmap mode (Dual-Pol: HH, VV) 화상을 취득하여 향후 고해상도 X-밴드 화상의 활용 방안 및 효용성에 대해 검토해 보았다. 함께 취득된 현장자료와의 비교를 통하여 2010 년에 발사될 예정인 아리랑 5 호의 활용방안을 찾고자 한다. 여기서는, 연안에 설치된 양식시설, 소형 선박 그리고 코너리플렉터에 대해서 해석을 수행하였다. 김 양식시설의 경우, 구조와 설치 각도에 따라 다른 후방산란특성을 보였으며, 같은 시설에 대해서도 HH 편파의 후방산란계수가 VV 보다 2.6 dB 높게 나타났다. 그 이유는 김 양식시설이 TeraSAR-X의 전파전파 방향과 수직하게 되어 후방 산란이 많이 일어나는 반면에, B 지역에 설치된 김 양식시설은 TeraSAR-X의 전파전파방향과 약 45 도 비스듬하게 설치되어 있어, 상대적으로 낮은 후방산란계수를 나타내기 때문이다. 또한 한 변의 길이가 각각 1 m, 0.6 m 인 사각면 삼각 수동 전파반사기 두 개를 제부도 북쪽의 갯벌에 설치하여 TerraSAR-X 의 화상에 나타난 후방산란특성을 분석하였다. TerraSAR-X 의 화상이 X-밴드를 사용하고, 높은 해상도로 인해 power spill이 넓게 분포하는 것을 볼 수 있다.