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http://dx.doi.org/10.9719/EEG.2011.44.3.239

Hydrologic Characterization through Ground Water Monitoring in a Coastal Aquifer  

Shim, Byoung-Ohan (Geological Research Division, Korea Institute of Geoscience and Mineral Resources)
Lee, Chol-Woo (Geological Research Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Economic and Environmental Geology / v.44, no.3, 2011 , pp. 239-246 More about this Journal
Abstract
Groundwater in small islands is used as main water resource but the overuse of groundwater may cause seawater intrusion and temperature decrease in geothermal wells. This study aimed to characterize the hydrogeology of Maeum-ri area in Seokmo Island of Ganghwagun using long-term monitoring at groundwater wells and geothermal wells. In the monitoring period seasonal water level change, consistent drop or increase of water levels are not detected. The groundwater temperature about 10m below ground surface shows year cycle variation having two to five months difference with ambient temperature cycle. The storativity was calculated by tidal method. The storativity estimated by adapting tidal efficiency factor showed some larger values than that by using tidal time lag. The result suggested that the tidal method assuming several assumptions on aquifer condition may produce broad ranges but the calculated ranges at this application are reasonable. The similar shape of groundwater level change and tidal effects was observed at several wells clustered east-south-east direction which may implicate the distribution of vertical fracture system strongly related with groundwater flow channels. The applied methodology and study results will bc valuable to evaluate optimal pumping rate for the preservation of groundwater resources, and to manage geothermal development.
Keywords
coastal aquifer; tidal method; geothermal well; hydrogeology; long-term monitoring;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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