GIS-based Vulnerability Assessment to Saltwater Intrusion of coastal aquifer in Jeju Island, KOREA.
Abstract
The purpose of this study is to assess the vulnerability of saltwater intrusion in Jeju Island, Korea. This study used GALDIT method (Chachadi and Lobo-Ferreira, 2001) that is a quantitative vulnerability assessment method based on GIS technique, which provides a visual overview of seawater intrusion vulnerabilities. Main evaluation factors of this method are aquifer characteristics, aquifer hydraulic conductivity, depth to groundwater level above sea, distance from the coast, current extent of seawater intrusion, and aquifer depth. When the original GALDIT method is applied to Jeju Island, the evaluated GALDIT index were found to be overestimated for the majority of inland areas that are actually safe against saltwater intrusion. The improved methods suggested by this study has made clear the distinction between vulnerable areas of saltwater intrusion and non-vulnerable areas in Jeju Island. The results indicated that four out of 132 observation points on the island's monitoring network were classified as very high vulnerability group of the GALDIT Index, and 15 of them as high vulnerability group. These findings should focus more on ease of index use, considering the possible use as a quantitative indicator of rational decision making for water resources management of coastal aquifers
Key words : saltwater intrusion, vulnerability index, GALDIT test, Jeju Island Acknowledgements. This research was supported by a grant (code number: 18RDRP-B076272-05 ) from the Jeju Regional Infrastructure Technology Development Center funded by Ministry of Land, Infrastructure and Transport of Korean government. References Chachadi A.G. and Lobo-Ferreira, J.P. (2001) Sea water intrusion vulnerability mapping of aquifers using GALDIT method. Proc. Workshop on modelling in hydrogeology, Anna University, Chennai, pp.143-156.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.H23J2044C
- Keywords:
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- 1812 Drought;
- HYDROLOGYDE: 1829 Groundwater hydrology;
- HYDROLOGYDE: 1880 Water management;
- HYDROLOGYDE: 6309 Decision making under uncertainty;
- POLICY SCIENCES