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http://dx.doi.org/10.5467/JKESS.2017.38.7.570

An Analysis of Seawater Effect on Groundwater Quality, in the Region of Sinan-gun area, Jeonam, Korea  

Shin, Kyungsun (Department of Science Education, Ewha Womans University)
Koh, Dong-Chan (Korea Institute of Geoscience and Mineral Resources)
Lee, Jeonghoon (Department of Science Education, Ewha Womans University)
Publication Information
Journal of the Korean earth science society / v.38, no.7, 2017 , pp. 570-580 More about this Journal
Abstract
The purpose of the study was to evaluate the groundwater quality of Sinan-gun, Jeollanam-do, an island located in the southern part of the Korean peninsula where the effect of seawater on the groundwater quality had not been investigated in the past. In order to evaluate its effect, the hydrogeological parameters including groundwater quality and major dissolved components were investigated. The water quality was measured four times in the field, and 74 of 163 samples that showed the high conductivity value of more than $500{\mu}S/cm$ and the influence of seawater on the groundwater were analyzed by $Cl^-/HCO_3{^-}$ molar ratio. The results showed that, 40 samples out of 74 were found to have a value of 2.8 or more, indicating severe and very severe effects. According to the type of groundwater quality, the ratio of samples belonging to Na-Cl type, which is considered to be influenced by the direct seawater, is 35.3% for bedrock groundwater and 52.5% for weathered zone and alluvial groundwater. In the evolution stage of groundwater due to seawater infiltration, the type of Ca-Cl prior to the Na-Cl type is 44.1% in bedrock groundwater and 45% in weathered zone and alluvial groundwater. The effect of sea water on the aquifer is likely to be influenced by distance from the shore, pumped water, and tide.
Keywords
archipelago; seawater intrusion; groundwater; electrical conductivity;
Citations & Related Records
Times Cited By KSCI : 9  (Citation Analysis)
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