Econ. Environ. Geol. 2001; 34(5): 485-498

Published online October 31, 2001

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Interpretation of Groundwater System and Contamination by Water-Quality Monitoring in the Daejung Watershed, Jeju Island

Nam-Chil Woo1*, Hyung-Don Kim1, Kwang-Sik Lee2, Won-Bae Park3, Gi-Won Koh4 and Young-Suk Moon4

1Dept. Earth System Sciences, Yonsei University, Shinchon-Dong, Sudaemoon-Gu, Seoul 120-749
2Korea Basic Science Institute
3Jeju Development Institute
4Jeju Provincial Water Resources Management Office

Correspondence to :

Nam-Chil Woo

ncwoo@ysgeo.yonsei.ac.kr

Received: August 31, 2001; Accepted: October 23, 2001

Abstract

This study was objected to identify the temporal and spatial variations of groundwater quality and contamination using monthly groundwater monitoring data collected from 30 wells in Daejung watershed, Jeju Island. Water samples were analyzed for major cations, anions, and environmental isotopes including 18O-H2O, 2H-H2O and 15N-NO3. The groundwater represented mostly Na(Mg)-HCO3 type, with local change toward Ca-HCO3 type and Na-Cl type. Groundwater quality depends upon various factors such as the local groundwater flowpaths, input of surface contaminants with recharge events, and sea-water intrusion along the coastal area. Nitrate contamination changed temporally according to recharge events and spatially. δ18O-δ2H data for monthly sampled groundwaters showed
distinctive clusters, implying that groundwater was originated from independent precipitation, and subsequently recharged very fast. Using δ15N-NO3 data, major sources of nitrate and its areas of influence could be identified. The areas under influence of livestock farms showed relatively high NO3-N concentrations and δ15N values higher than 5‰. The agricultural areas in southeastern part showed very high concentrations of NO3-N with the δ15N values of lower than 5‰.

Keywords water-quality monitoring, environmental isotopes, sea-water intrusion, groundwater contamination, nitrate

Article

Econ. Environ. Geol. 2001; 34(5): 485-498

Published online October 31, 2001

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Interpretation of Groundwater System and Contamination by Water-Quality Monitoring in the Daejung Watershed, Jeju Island

Nam-Chil Woo1*, Hyung-Don Kim1, Kwang-Sik Lee2, Won-Bae Park3, Gi-Won Koh4 and Young-Suk Moon4

1Dept. Earth System Sciences, Yonsei University, Shinchon-Dong, Sudaemoon-Gu, Seoul 120-749
2Korea Basic Science Institute
3Jeju Development Institute
4Jeju Provincial Water Resources Management Office

Correspondence to:

Nam-Chil Woo

ncwoo@ysgeo.yonsei.ac.kr

Received: August 31, 2001; Accepted: October 23, 2001

Abstract

This study was objected to identify the temporal and spatial variations of groundwater quality and contamination using monthly groundwater monitoring data collected from 30 wells in Daejung watershed, Jeju Island. Water samples were analyzed for major cations, anions, and environmental isotopes including 18O-H2O, 2H-H2O and 15N-NO3. The groundwater represented mostly Na(Mg)-HCO3 type, with local change toward Ca-HCO3 type and Na-Cl type. Groundwater quality depends upon various factors such as the local groundwater flowpaths, input of surface contaminants with recharge events, and sea-water intrusion along the coastal area. Nitrate contamination changed temporally according to recharge events and spatially. δ18O-δ2H data for monthly sampled groundwaters showed
distinctive clusters, implying that groundwater was originated from independent precipitation, and subsequently recharged very fast. Using δ15N-NO3 data, major sources of nitrate and its areas of influence could be identified. The areas under influence of livestock farms showed relatively high NO3-N concentrations and δ15N values higher than 5‰. The agricultural areas in southeastern part showed very high concentrations of NO3-N with the δ15N values of lower than 5‰.

Keywords water-quality monitoring, environmental isotopes, sea-water intrusion, groundwater contamination, nitrate

    KSEEG
    Dec 29, 2023 Vol.56 No.6, pp. 629~909

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