Econ. Environ. Geol. 2001; 34(3): 255-269
Published online June 30, 2001
© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY
Correspondence to : Yong Kwon Koh
The geochemical studies on groundwater in the borehole, which is straddled by multi-packer (MP) system, were carried out from a volcanic terrain in the Yeosu area. The pH of groundwater collected from selected sections in the MP-installed borehole is much higher (up to 9.6) than that of the borehole groundwater (7.0~7.9) collected using conventional pumping technique. Hydrochemistry shows that the groundwater has a typical chemical change with increasing sampling depth, suggesting that the groundwater is evolved through water-rock interaction along the fracture-controlled flow paths. The groundwater from the deeper part (138~175 m below the surface) in borehole K1 is characterized by the Ca-Cl2 type with high Ca (up to 160 mg/L) and Cl (up to 293 mg/L) contents, probably reflecting
seawater intrusion. The groundwater also has high sodium and sulfate contents compared to the waters from other boreholes. These observed groundwater chemistry is explained by the cation exchange, sulfide oxidation, and mixing process with seawater along the flow path.
Keywords borehole groundwater, multi-packer, geochemistry, seawater mixing, water-rock interaction
Econ. Environ. Geol. 2001; 34(3): 255-269
Published online June 30, 2001
Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.
Yong Kwon Koh*, Kyeong Su Kim, Dae Seok Bae, Chun Soo Kim and Kyeong Won Han
Korea Atomic Energy Research Institute, P.O. Box 105, Yusung, Taejon 305-600, Korea
Correspondence to:
Yong Kwon Koh
The geochemical studies on groundwater in the borehole, which is straddled by multi-packer (MP) system, were carried out from a volcanic terrain in the Yeosu area. The pH of groundwater collected from selected sections in the MP-installed borehole is much higher (up to 9.6) than that of the borehole groundwater (7.0~7.9) collected using conventional pumping technique. Hydrochemistry shows that the groundwater has a typical chemical change with increasing sampling depth, suggesting that the groundwater is evolved through water-rock interaction along the fracture-controlled flow paths. The groundwater from the deeper part (138~175 m below the surface) in borehole K1 is characterized by the Ca-Cl2 type with high Ca (up to 160 mg/L) and Cl (up to 293 mg/L) contents, probably reflecting
seawater intrusion. The groundwater also has high sodium and sulfate contents compared to the waters from other boreholes. These observed groundwater chemistry is explained by the cation exchange, sulfide oxidation, and mixing process with seawater along the flow path.
Keywords borehole groundwater, multi-packer, geochemistry, seawater mixing, water-rock interaction
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