• Title/Summary/Keyword: 수질 변동

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Temporal and Spatial Fluctuations of Coastal Water Quality and Effect of Small Tide Embankment in the Muan Peninsula of Korea (무안반도 연안수질의 시ㆍ공간적 변동과 소규모 방조제의 영향)

  • Lee Dae-In;Cho Hyeon-Seo;Lee Gyu-Hyung;Lee Moon-Ok
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.6 no.4
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    • pp.24-36
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    • 2003

  • In this study, we estimated the seasonal fluctuations of water quality and effect of small tide embankment in coastal water around the Muan Peninsula, which is located in the northern part of Mokpo city, and layer farming ground is spread around there. Some physical and chemical factors were analyzed to characterize water quality from Jan. to Oct. in 1994. The results were as follows: Dissolved oxygen was slightly under saturation in the almost areas of July, and in some bottom layer at ebb tide of October. Distribution of COD showed high values that over 2㎎/L in October and flood tide of April by the discharge of freshwater and resuspension of benthic sediment, which exceeded water quality criteria II. Maximum values of dissolved inorganic nitrogen ware appeared in surface layer during the flood tide of October, while minimum of that showed in surface layer in April. Concentration of dissolved inorganic phosphorus was higher at July than the others, which ranged from 0.24 to 2.08㎍-at/L. Mostly mean values of N/P ratio were lower than 16, it mean that nitrogen is more limiting nutrient than phosphorus for the growth of phytoplankton. The values of eutrophication index were in the range of 0.07~0.81. However, very high values due to increase of COD were estimated near the tide embankment and southern part in relation to tidal current in October. Water quality around tide embankment was suddenly changed worse within a short period after opening the water gate during the rainfall.

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Characteristics of Long-term Water Quality Trend of Dongrae Hot Spring (동래온천의 장기적인 수질 변동 특성)

  • Jeon, Hang-Tak;Hamm, Se-Yeong;Lee, Cholwoo;Lee, Jong-Tae;Lee, Jeong Rak
    • The Journal of Engineering Geology
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    • v.30 no.3
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    • pp.379-397
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    • 2020

  • In this study, Long-term change of water quality in Donrae Hot Spring was characterized using water quality data from 1922 to 2019. According to Mann-Kendall analysis and Sen's slope using long-term water quality data of Dongnae Hot Spring from 1922 to 2019, temperature, Ca, SiO2, and HCO3 show an increasing trend whereas EC, Na, K, Mg, Cl, and SO4 show a decreasing trend or negligible trend. In addition, the water type of Dongnae Hot Spring stably belongs to Na-Cl type over time. The spatial distributions of water temperature and chemical constituents in 2004, 2009, 2014, and 2019 show variable patterns with showing some difference depending on sampling locations in different years. These results indicate that despite the long-term pumping of the hot spring water, the water quality is quite stable during the entire study period.

  • https://doi.org/10.9720/kseg.2020.3.379 인용 PDF KSCI HTML

Water Quality Management of Kwangyang Bay by Point Pollution Source Control (점원 오염부하 제어에 의한 광양만의 수질관리)

  • Lee Dae-In;Park Chung-Kil;Cho Hyeon-Seo
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.4 no.3
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    • pp.28-39
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    • 2001

  • The eco-hydrodynamic model was used to simulation water quality of Kwangyang Bay according to the environmental variation for appropriate water quality management. The mean concentration of COD was 3.3㎎/L, this exceeded the third class of water quality criteria. Waste water discharging loads showed approximately 90% of total pollutant loads. For satisfaction to below 10㎍/L of Chl. a and 2㎎/L of COD, above 35% reduction of present pollutant loads of point sources are needed.

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