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

전체 글

(1) , 34, 5 , 485-498, 2001 Econ. Environ. Geol., 34(5), 485-498, 2001.

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(5) . . . . . . . . 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 1. Dept. Earth System Sciences, Yonsei University, Shinchon-Dong, Sudaemoon-Gu, Seoul 120-749 Korea Basic Science Institute 3Jeju Development Institute 4 Jeju Provincial Water Resources Management Office 2. 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 .. . . water-quality monitoring, environmental isotopes, sea-water intrusion, groundwater contamination, nitrate.

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(93) . . Spatial variation of electric conductivity of groundwater: (a) March, (b) July..

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(115) . . . 4+ ). . . (). . . . Relationship between Cl and NO3-N concentrations in groundwater: The best-fit line was drawn only for the data with Cl concentration less than 50 mg/L..

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(129) 'O5 ï0. sQ from selected wells (28, 7, 20, 5, 15, 25): JN-1 and JN-2 Z |}=* k ºúrM >,* Ñ X5 ¥ indicate that there were two sampling rounds in June.. . . . .

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(150) . . 0.4 3.5 0.5 200. 60. 0.9 10. 00. 0.6 0.1 0.1 19.5 2.1 20. 0.4 0.3 0.3 00. 00.. . . Daily precipitation at the Kocheng Weather Station of Jeju island in 2000 Jan. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31. .

(151) . . ?/+. (unit : mm). Feb. Mar. Apr. May. Jun. Jul. Aug. Sep. Oct. Nov. 0.3 2.7 1.8 0.4 0.1 0.2 1.3 0.6 -. 3.1 10.9 00. 2.8 180. 0.2 00. 0.2 0.2 1.4 00. 0.4. 0.2 00. 50. 1.5 0.2 1.9 0 00. 0.6 2.5 0.1 16.5. 0.2 0.9 0.1 3.3 0.1 0.1 8.3 0.2 250. 18.5 110.. 1.3 70. 0.5 9.3 0.3 3.1 2.3 5.9 38.5 0.6 8.6 6.7 0.2 00. 11.6 25 0 0.6. 22.5 560. 0.8 0.4 0.7 13.2 0.1 0.7 -. 1.3 0.8 1.2 1.6 5.7 0.2 00. 6.4 450. 12.5 00. 00. 590. 0.8 0.2 1.2 0.5 1.1 00. 1.2 90.5. 0.2 00. 6.6 00. 1.1 0.3 1.7 4.2 3.3 154.5 2.5 00. 00. 0.3 0.4 130. 10.1. 00. 180. 0.6 23.5 00. 20. 00. 0.5 7.8 6.5 0.1 00. 12.3. 210. 3.1 00. 00. 0.5 18.5 00. 11.3 22.5 00. 13.1. Shaded dates indicate sampling periods..

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(187) M ´ ë=* 5 há ½ + ´+ O = Z

(188) 9 Am 4+ T9

(189) M 7 M? + ´Z ´= ÑO + ×M * d

(190) £B Õ+ + \ $hZ ×5 -QT- yZ P A òÔ , # O¥l= Z

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(198) + T9

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(227) -

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(230) ( $(Z ØT h ÇB Ù .=* iîJ ( $(A T- ¢y"#1 -.¾ .Z ¥s#= >, ¯ à DQA Ù L 9

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(233) ( $(Z HN i+ ¸5 1 ´+ *# M? . ¥s#= ÀÁJ 6 L9

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