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DOI : ,    Vol.6, No.4, 15 ~ 27, 1998
Title
A Study on Salinization of Groundwater by Seawater Intrusion in the East Area of Cheju Island
최윤영Yun Young Choi,고병련Byong Ryun Ko,심창석Chang Suk Sim,최정우Jung Woo Choi,고수현Soo Hyun Ko
Abstract
The study area is the eastern part of Cheju island where salinization occurs severely by seawater intrusion. Physical and chemical water quality analysis is performed for widely spread groundwater tube wells of 32 points and springs of 15 points in the east area of Cheju island. It is found that Gujwa and Sungsan zone show the water quality component of Cl-SO₄ and Cl-SO₄-HCO₃, and Pyosun zone HCO₃-Cl-SO₄ from the results of classification by Back`s type(1961). From the characteristics of March and September, Gujwa and Pyosun zone don`t show the variation of water quality but Sungsan zone shows the movement of a part from Na-Ca type to Ca-Na type on the side of the positive ions. The causes of water quality variation and water property are from the seawater intrusion. It is thought that Gujwa and Sungsan zone have strong correlation of Cl and Na that is the index of the salinization while their correlation in Pyosun zone is weak from the result of comparision and examination by the statistical method of SAS for extraction of the ionic factors that indicate the salinization source among the study areas.
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