• 환경생물
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• 제26권4호
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• pp.303-310
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• 2008

Heavy metal concentration of Fe, Zn, Cu, Cd and Pb were analysed from seaweeds (Ulva pertusa, Sargassum thunbergii, Caulacanthus okamurae), sediments and seawater at the two experimental sites of Daebul and Sabjin industrial complex in Mokpo coastal area with a control site (Heugsando). Highest values of heavy metals were found at two experimental sites influencing by various pollution sources such as industrial drains, sewage and harbours. In contrast, the lowest concentrations was observed at the control site without any pollution source. The concentration levels of accumulated heavy metals were in the following order: seaweeds > sediments > seawater. Similar spatial distribution patterns were observed at the seaweeds, sediments and seawater for the highest mean values of the different heavy metals. This result show that seaweeds could be used as a biomonitors of heavy metals at coastal region.

• 한국환경과학회지
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• 제32권3호
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• pp.181-189
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• 2023

In this study, sediment cores from unvegetated tidal flats in the Hampyeong Bay (west coastal wetland) and Dongdae Bay (south coastal wetland) were sampled, the blue carbon stock in the sediments was calculated, and the characteristics of the blue carbon stock were analyzed based on particle size of the sediments. The sediments in the Hampyeong Bay tidal flat had large particle size and low mud content, and the Dongdae bay tidal flat had small particle size and high mud content. The organic carbon content and blue carbon stock in the sediments were higher in the Dongdae tidal flat than in the Hampyeong Bay tidal flat. As a result of the regression function, in both the Hampyeong Bay and Dongdae Bay tidal flats, the sediments had the smaller particle size and higher mud contents the higher the organic carbon content and blue carbon stock. The sediments with smaller particle size had the larger specific surface area, so were feasible to adsorb and store more organic matters.

• 한국지구과학회지
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• 제24권4호
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• pp.337-345
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• 2003

황해 남동해역의 제주도 연안에 분포하고 있는 퇴적물의 근원지를 조사하기 위해 표층 퇴적물의 입자조직, 지화학 성분 그리고 점토광물 분석이 이루어졌다. 본 연구에서 Ti/AI, Nb/Al 그리고 Rb/Al 비 등을 포함한 특징적인 원소성분도(geochemical discrimination diagram)와 희토류 원소들의 함량 특성은 퇴적물의 근원지를 판단하는데 매우 유용한 지시자들로 제시된다. 이들 결과에 의하면, 연구해역의 세립질 퇴적물은 대부분 증국의 양자강으로부터 기원 ${\cdot}$ 운반 퇴적되었으며, 조질질 퇴적물은 주변 화산암의 풍화 잔류물인 것으로 해석된다. 창해와 동중국해에서 치근 조사된 해수의 순환 패턴과 물리-화학적 특성은 양자강으로부터 기원된 세립 퇴적물이 연구해역을 포함한 한반도 남해(황해 남동해역) 연안역까지 운반 퇴적될 수 있음을 보여준다.

• 환경위생공학
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• 제11권3호
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• pp.9-12
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• 1996

Polychlorinated biphenyl (PCBs) is one of major toxic pollutants in marine environments, This artificial chlorinated compound has been found in freshwater, seawater, soil, sediments and organismes living in various environments. Because of its toxicity and degradability, its uses in industrial processes have been banned after 1984 in Korea. Coastal area is an important environment for agriculture, industry, transportation, reduction of pollution loads through biogeochemical processes, cycling of nutrients and recreation. Input of pollutants from land and freshwater has been occurring through runoff, rivers and estuaries. Concentrations of PCBs were determined with GC-ECD. Concentrations of PCBs were in the range of 1.0 - 19.2 ng/g-dry weight of sediment(g-d.w.) at Ulsan, 4.5 -8,2 ng/g-d.w. at Onsan, 2.7 - 33.5 ng/g-d.w. at Masan and 4.0 - 60.7 ng/g-d.w. in Kwangyang, In Inchon area, PCBs were not detected in sediments. In sediments of Nakdong estuary, the distribution of PCBs' concentrations was 0.19 - 303 ng/g-d.w.

• 한국환경과학회지
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• 제10권4호
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• pp.275-280
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• 2001

In an attempt to evaluate the possibility of producing an organic fertilizer using sediments from coastal farming areas, the chemical composition, bacteriological quality and heavy metals in the sediments alkalized by conditions : a 1:4 mixture of dry sediment to food wastes and the addition of 30% quicklime to the mixture. According to the classification standard for compost constituent by Higgins, all composts had a low or intermediate grade in T-N and $K_2O$ content, a low grade in $P_2O_5$ and a high grade in CaO and MgO content. Stabilization by quicklime and magnesium hydroxide is likely to inhibit th bacterial decomposition of organic matter and the actigity of pathogenic organic. Raising the pH of stabilized sediment to 12 for 2 hours(PSRP criteria of EPA) allowed 99.99% of the coliform group, fecal group and viable cell count to be reduced. the results suggested that the crude fertilizer produced by alkaline stabilization method was innoxious and thereby the sediments from coastal farming areas could be used as organic fertilizer.

• 자원환경지질
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• 제31권1호
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• pp.69-84
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• 1998

A geochemical study was carried out to define how marine shore sediments are related to their terrestrial source rocks in the region of Taean and Byunsan Peninsula, western Korea. The lithology of the coastal part of the study area is composed of Pre-Cambrian granite gneiss, schist, Jurassic terrestrial sedimentary rocks, and Cretaceous plutonic intrusives. Shore sediments are transported from three drainage tributaries. The sediments consist of quatrz with clay minerals, such as illite, kaolinite, smectite, chlorite. Heavy minerals include hematite, ilmenite, rare amount of zircon and apatite. Compared to those in coastal rocks, amount of heavy minerals in the sediments is considerably low. The low content of heavy minerals is thought to be attributed to the heavy mineral detainment in the river beds and influences of tidal currents which cause heavy minerals to accumulate in specific spots. Chemical composition of the major and trace elements, trace elements, and REE chondrite normalized pattern suggest that shore sediments transported from the corresponding drainage tributary show close mineralogical and geochemical relationships with the source rocks distributed in the Taean and Byunsan Peninsula.

• 한국수자원학회논문집
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• 제32권5호
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• pp.547-555
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• 1999

연안표사이동경로를 Lagrangian 관점에서 파악하는데 이용되는 형광사를 저렴한 비용으로 제작하는 방법을 제안하였다. 형광도료는 형광안료, 아세톤, 크실렌 등을 배합하여 제작하였다. 모래는 가마미 해수욕장에서 채취한 후, 염분을 제거하기 위하여 감수로 세척하였으며, 미세입자의 비산을 방지하기 위하여 실내에서 건조하였다. 건조된 표사는 체분석하여 원하는 크기로 분류하여 준비된 형광도료와 배합하여 7가지 색상의 형광사를 제작하였다. 제작된 형광사는 영광 원자력발전소 취수로 내로 유입되는 표사공급경로를 파악하기 위하여 사용되었다. 형광사를 이용한 현장실험 결과, 강한 북서계절풍 및 조류에 의하여 부유·확산되고 있는 표사가 창조시 취수로의 강한 흡입유속에 의하여 취수로 내부로 유입되는 양상을 보였다. 또한, 모든 형광사 투입지점에서 표사유입이 확산된 점으로 미루어 보아 표사가 취수로 내부로 인근해역의 모든 방향에서 공급되고 있는 것으로 파악되었다.

• Fisheries and Aquatic Sciences
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• 제3권2호
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• pp.126-134
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• 2000

We investigated the distribution of the marine cladoceran resting eggs in the intertidal sediments of Gomso Bay, Korea and compared the data with those in the subtidal sediments. The abundance of the eggs in the top 6cm of the sediments was higher than that in the other depths. The abundances of the eggs in seaward intertidal sediments below mean sea level (MSL) were higher than those in the sediments over MSL, but were not significantly different from those in the subtidal sediments. The distribution of the resting eggs of cladocerans in the intertidal sediments was affected by the grain-size and moisture content of sediments. The results of the present study suggest that the intertidal sediments as well as the subtidal sediments are a potential egg bank which plays important roles in population dynamics of zooplankton in coastal waters, in particular, recruitment of eggs into plankton.

• 한국지하수토양환경학회지:지하수토양환경
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• 제26권1호
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• pp.17-23
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• 2021

In order to investigate change of shear strength of coastal muddy sediment by mixing pretreated oyster shells with different pyrolysis temperatures and particle sizes, a vane shear test was carried out. The shear strength of the sediment with oyster shells pyrolyzed at 800℃ was twice higher than that of the control, with a maximum shear strength of ca. 0.2 kPa. The Ca2+ concentration in the pore water was the highest at sediment with oyster shells pyrolyzed at 800℃ with a concentration of ca. 790 mg/L. From the above results, it is concluded that the application of the oyster shells pyrolyzed at 800℃ can affect the increase in shear strength of coastal sediments through the aggregation of clay particles and pozzolanic reactions with sediments.

• 한국해안해양공학회:학술대회논문집
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• 한국해안해양공학회 2000년도 한국해안해양공학발표논문집 Proceedings of Coastal and Ocean Engineering in Korea
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• pp.140-148
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• 2000

The nearshore currents are required for the preservation of coastal areas and the more pressing environmental problems since they cause sediments to be in suspension and transport the sediments into tranquil regions. Numerical models are often used to calculate current patterns formed around man-made or naturally caused changes around the coastal area. (omitted)