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Characterization of Groundwater Quality and Recharge using Periodic Measurements of Hydrogeochemical Parameters and Environmental Tracers in Basaltic Aquifers of Jeju Island  

Koh, Dong-Chan (Korea Institute of Geoscience & Mineral Resources (KIGAM))
Cheon, Su-Hyun (Korea Institute of Geoscience & Mineral Resources (KIGAM))
Park, Ki-Hwa (Korea Institute of Geoscience & Mineral Resources (KIGAM))
Publication Information
Journal of Soil and Groundwater Environment / v.12, no.4, 2007 , pp. 60-71 More about this Journal
Abstract
Groundwater from public wells was monitored during one year with two month interval for hydrogeochemical parameters and chlorofluorocarbons (CFCs) as environmental tracers in Jeju Island. Concentrations of major cations and $SiO_2$ show variation less than 10% whereas $NO_3$ and dissolved oxygen (DO) showed larger variation though DO variation did not change oxic or suboxic condition. $NO_3$ concentration has no consistent seasonal pattern with the largest variation of 35%. Groundwater ages determined by CFCs became temporarily younger by 5 years in October for groundwater with ages of 15 to 25 years, which can be attributed to infiltrating water in rainy season. Compared to air temperature, groundwater temperature has much smaller variation with no phase difference, which can be accounted for by a two-component model consisting of infiltrating water from surface and deeper groundwater with negligible temperature variation. The relatively small variation in groundwater age and temperature indicates that groundwater recharge through fast flow-paths is much smaller compared with basal groundwater in terms of aquifer storage.
Keywords
Annual variation; Hydrogeochemistry; Groundwater age; Groundwater recharge; Jeju Island;
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Times Cited By KSCI : 2  (Citation Analysis)
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