The variation of the seawater/freshwater interface at the coastal aquifer in Yongho bay, Busan

This study site is the coastal aquifer in Yongho bay, Busan and is intruded by seawater. Aquifer media are formed reclaimed sedimentary layer, weathered soil layer, weathered breccia layer and bedrock. The bedrock consists of tuffaceous sedimentary rock, andesite and andesitic volcanic breccia. A monitoring well is approximately 180 m away from the coastal line. The developed and casing depth of the monitoring well are 120 m and 19 m below ground surface, respectively.

It needs groundwater level, density and pressure for estimating a seawater/freshwater interface. For calculating density of freshwater and seawater in the monitoring well, the electrical conductivity was measured by TLC meter. And, the variation of groundwater level and pressure were measured by Levelogger. Groundwater level was observed from August 21 st 2008 to October 18th 2008 and the variation of groundwater level appears by tide level and precipitation. The seawater/fresh water interface which was estimated by groundwater level, density and pressure was influenced by variation of tide level. However, periodicity of the interface was not precise as compared with tide level. The correlation coefficient between the interface and groundwater level appeared a high value (0.922), but the correlation coefficient between the interface and tide level was not (0.169). As a result of the linear regression analysis between the interface and groundwater level, the coefficient of determination in the freshwater and seawater zone appeared greatly high for the coefficient is 0.983 and 1.000, respectively. Through this study, the variation of the seawater/freshwater interface by the groundwater level at the coastal aquifer in Yongho bay was confirmed.



Copyright: © Aristotle University of Thessaloniki
Quelle: 2nd International Conference 2009 (Juni 2009)
Seiten: 7
Preis inkl. MwSt.: € 5,00
Autor: S.S. Kim
D.H. Kang
T.Y. Kim
S.I. Yang
B.H. Kwon

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