• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.613-616
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• 2007

The main structures that comprise a tidal power plant are turbine structure, sluice structure, tide embankment and gate. Since these structures are founded on seabed ground, an extensive geotechnical site investigation to evaluate the engineering properties of field soils must be conducted prior to design and construction. According to the results of geotechnical site investigation conducted at the planned site for construction of Incheon bay tidal power plant, soft ground generally lie 7 meters below the seabed surface level. This research suggests the reliable and economical design of foundations and ground improvements required for construction of main structures in Incheon bay tidal power plant, with considerations on field conditions.

• Environmental Sciences Bulletin of The Korean Environmental Sciences Society
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• v.4 no.3
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• pp.149-156
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• 2000

This study presents an investigation of the changes that have occurred in the coastal ocean area of Kwangyang Bay located in the South Coastal region of Korea using remote sensing data based on Landsat Thematic Mapper (TM) multispectral digital data from 1988 and 1996. The coastal changes were detected using the digital histogram method and vector trace method. All the images were preprocessed, i.e. geometrically corrected, before the training set selection. when comparing the histograms of 7-band TM data, it was found that the band 5 image exhibited two critical Digital Number(DN) peaks, thereby indicating new coastal water and coastal land data. Based on this information, the coastal ocean area of the band 5 image was calculated using the vector tracing method supported by a CAD program. The result shows that the coastal ocean area decreased by about 5 % between 1988 to 1994. Accordingly, this gives a strong indication that the continuing land development will have a serious impact on the ecosystem of Kwangyang Bay.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.11 no.1
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• pp.1-7
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• 1975

The physical oceanographic investigations in Kwang Yang Bay, were carried out for seven times from May 1974 to May 1975. The results of this survey show that the salinity of the bay water is generally lower than that of the adjacent sea water, and mean surface salt ni ty in March and July were 20.8-25.2\ulcorner and 31. 8-32. 5\ulcorner. The month with the minimum surface water temperature was January with $2.5~5.2^{\circ}C:$ the maximum monthly value was $ 23.8-24.2 ^{\circ} C$ in September. The surface water temperature were related to the heat budget at the sea surface in the bay water, the degree of relationship was good. The mean vertical stability in the bay water(0-10m)were 297XI0^{-6} in July and -IXto^{-6} in January. The computed vertical stability indicate that the vertical mixing could move down to the depths of 15m during late autumn and winter, but the rest of season hardly take place to the depths of tom.

• 한국해양학회지
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• v.16 no.2
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• pp.43-48
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• 1981

To carry out baseline studies on monitoring systems for red tides in Jinhae bay, measurements and analyses were made on seawater samples from 15 sampling stations during 15 months from July, 1979. Water quality parameters studied are temperature, pH, DO, salinity, COD, SS, NO$\sub$3/, NO$\sub$2/, PO$\sub$4/, SiO$\sub$2/, Ca, Mg, Cd, Cu, Pb, Zn, Chlorophyll ${\alpha}$, diatoms and dinoflagellates. Multiple regression analyses were undertaken with chlorophyll ${\alpha}$, cell numbers of diatoms and dinoflagellates as the dependent variables and water quality parameters as the independent variables. The results showed that biomass, expressed as total cell numbers of diatoms and dinoflagellates, was largely influenced by COD, salinity and nutrients.

• Korean Journal of Microbiology
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• v.13 no.4
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• pp.165-172
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• 1975

A strain of Azotobacter species was isolated from the surface sea water of Kwang-yang Bay in Korea and was identified as Azotobacter insignis. In order to reveal the natural habitat of this microorganism, growth at various salt concentrations was tested with the result of 3% NaCl beins optimum. Only slight growth was detected in the absence of NaCl. This result was thought to prove (in part) that the natural habitat of the strain dealt with is sea water. Fairly good growth was obtained at 6% NaCl concentration. The study of effects of salt on the growth og this strain to various temperatures and pHs has shown that temperature $30{\circ}C and pH 7.0 are Optimum.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.8 no.2
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• pp.73-84
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• 1975

The present study was conducted to evaluate the effects of oil spill from the wastewater of Yeosu Refinery on water quality of hard clam culture beds in Taein-Ri, Kwang Yang Bay. Wastewater and oil spill may reach to the culture beds in 6-8 hours by tidal current movement. Water quality is nearly normal as unpolluted sea water except the concentration of n-hexane extractive chemicals which shows higher than unpolluted sea water in period of September to October in 1973. It may be caused by wastewater of Yeosu Refinery.

• Journal of the Korean Society of Marine Environment & Safety
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• v.26 no.3
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• pp.242-253
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• 2020

This study examined the ef ects of freshwater discharge by artificial dikes from the Kanwol and Bunam lakes on the dynamics in the Chunsu Bay, Yellow Sea, Korea, during the summer season based on three-dimensional numerical modeling experiments. Model performances were evaluated in terms of skill scores for tidal elevation, velocity, temperature, and salinity and these scores mostly exceeded 90 %. The variability in residual currents before and after the freshwater discharge was examined. The large amount of lake water discharge through artificial dikes may result in a dramatically changed density field in the Chunsu Bay, leading to an estuarine circulation system. The density-driven current formed as a result of the freshwater inflow through the artificial dikes (Kanwol/Bunam) caused a partial change in the tidal circulation and a change in the scale and location of paired residual eddies. The stratification formed by strengthened static stability following the freshwater discharge led to a dramatic increase in the Richardson number and lasted for a few weeks. The strong stratification suppressed the vertical flux and inhibited surface aerated water mixing with bottom water. This phenomenon would have direct and indirect impacts on the marine environment such as hypoxia/anoxia formation at the bottom.

• Journal of Korean Society on Water Environment
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• v.16 no.4
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• pp.421-430
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• 2000

To study the distribution and the behavior of trace metals in Kwangyang Bay, surface water samples were collected four times from August 1997 to May 1998 and were analyzed for trace metals (Cd, Co, Cu, Fe, Ni, Pb, Zn) by Atomic Absorption Spectrometer and Inductively Coupled Plasma Mass Spectrometer. Dissolved Co and Fe concentrations were comparatively high near the Seomjin River mouth. Particulate trace metal contents were relatively high near the Sueochun River mouth and near the Yeochun industrial complex. Distribution coefficients ($K_d$; $Lkg^1$) between dissolved and particulate phases of Fe, Pb, Co, Zn, Ni, Cu and Cd were $1.67{\times}10^8$, $1.37{\times}10^6$, $7.25{\times}10^5$, $4.43{\times}10^5$, $1.39{\times}10^5$, $9.1{\times}10^4$ and $1.8{\times}10^4$, respectively. In Kwangyang Bay, particulate trace-metal concentrations were as high as dissolved ones and showed seasonal and geographic variations.

• 한국해양학회지
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• v.19 no.2
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• pp.172-186
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• 1984

Phyroplankton samples were collected seasonally from March to December, 1982 in order to study the distribution of phyroplankton and their relation to environmental factors in Kwang-yang Bay. A total of 211 taxa of phyroplankton representing 67 genera, 196 species, 14 varieties, and 1 forma have been identified. Seasonal succession of dominant species is evident in this bay; Rhiwosolenia deiicatula, Chroomonas sp. being predominant in spring, Chroomonas sp. in summer, Chaetoceros debilis, C. socialis in autumn, and Skeletonema costatum, Chroomonas sp. in winter, repectively. The standing crops of the phyroplankton vary with time, and hare relevance to NH$\_$3/-N concentration, grazing pressure, and temperature. In spring, diatom blooming is relatively well correlated with the NH$\_$3/-N concentration. The species diversity is rather low in general. The fraction of nanoplankton total cell number represents an annual average of 36.5%, showing a meaningful contribution to the primary production and food web in this water system. Spatial distribution of phytoplankton indicates that this bay could e divided into three chracteristic areas; Seomjin-river mouth area heavily influenced by fresh water, western-half area scarecely affected by the oceanic water, and eastern-half area heavily influenced by the oceanic water. The industrial effluents from the YeochunIndustrial Complex also affected the spatial distribution of phyroplankton.

• Journal of the Korean Society for Marine Environment & Energy
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• v.5 no.1
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• pp.38-50
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• 2002

To study the distribution of organophosphorus pesticides which are extensively used for agriculture in Korea. Surface sea water samples were taken from 2 coastal areas during July and :;eptember of 1999 and sediment samples were collected from Kyeonggi bay in July of 1999. These samples were analyzed using a Gas Chromatography/Nitrogen Phosphorus Detector(GC/NPD). In coastal waters of the study areas IBP was commonly found the most compound. Traces of Diazinon, DDVP, Ethoprouhos and Chlorpyrifos were also encountered. Concentration of the other major organophosphorus pesticides(Disulfoton, Parathion Methyl, Fenchlorfos, Prothiofos, EDDP) were generally be below the detection limit of the employed analytical method. Tn sediment of the study areas Chlorpyrifos w3s found the most compound. Temporal and geographical distribution of individual organophosphorus pesticides is likely to be affected by types of agricultural practices in the watershed.