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A Geophysical Approach For Seawater Intrusion Assessment In The Eastern Coast Of Volcanic Island, Jeju, Korea
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 9th Congress of the Balkan Geophysical Society, Nov 2017, Volume 2017, p.1 - 5
Abstract
To characterize coastal aquifers, geophysical well logging and borehole temperature monitoring were applied systematically to the coastal area of Jeju Island, Korea. Geophysical well logging, especially electrical conductivity and temperature logs, determined spatial variations in the distributions of fresh water and salt water. Borehole temperature monitoring enabled us to characterize the variability of coastal aquifers at a high temporal and spatial resolution, and furthermore, heterogeneous aquifer systems and the behavior of fresh water and salt water could be estimated. A conceptual model of seawater intrusion in the eastern part of Jeju Island was proposed based on interpretation of the geophysical well logging and borehole temperature monitoring data. Freshwater-saltwater interfaces and main aquifers primarily formed the geological boundaries, implying that the coastal aquifers flow through the boundary between each volcanic formation. Consequently, geophysical well logging and borehole temperature monitoring could enhance knowledge of the subsurface structure of basalt and interactions of fresh water and salt water in coastal areas. This approach is expected to increase our understanding of and ability to manage groundwater systems of a volcanic island.