Application of GALDIT in Assessing the Seawater Intrusion Vulnerability of Jeju Island, South Korea

Seawater intrusion (SWI) is a major environmental threat to groundwater resources in coastal regions. GALDIT is an index-based SWI vulnerability model that is increasingly being used in many parts of the world to identify regions that are vulnerable to various types of SWI based on six major paramet...

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Bibliographic Details
Published in:Water (Basel) 2019-09, Vol.11 (9), p.1824
Main Authors: Chang, Sun Woo, Chung, Il-Moon, Kim, Min-Gyu, Tolera, Mesfin, Koh, Gi-Won
Format: Article
Language:English
Subjects:
Aquaculture
Aquifers
Coastal aquifers
Coastal zone
Decision making
Electric properties
Electrical conductivity
Electrical resistivity
Geology
Groundwater
Groundwater data
Groundwater levels
Groundwater management
Hydrogeology
Hydrologic data
Investigations
Management
Methods
Reliability analysis
Saline water intrusion
Salt water intrusion
Sea level
Sea-water
Seawater
Simulation
Surface water
Water
Water resources
Water table
Water, Underground
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Summary:Seawater intrusion (SWI) is a major environmental threat to groundwater resources in coastal regions. GALDIT is an index-based SWI vulnerability model that is increasingly being used in many parts of the world to identify regions that are vulnerable to various types of SWI based on six major parameters. In this study, we conducted a vulnerability assessment of Jeju Island to SWI based on several years of collected groundwater level data and hydrogeological values where the objectives of the study were to visualize the distribution of recent SWI, to increase the reliability of the GALDIT assessment method by improving current GALDIT techniques, and to respond effectively to diagnoses of SWI on Jeju. To improve the GALDIT assessment method to fit the Jeju model, the possibility of electrical conductivity was explored instead of standard GALDIT parameters that represented the existing impact of SWI. Improvements to the GALDIT vulnerability assessment method made it clear that groundwater became increasingly vulnerable to SWI in the existing high-vulnerability group. The results of this research may be used to develop a quantitative index for rational decision-making on policies and suggest the need for further improvements in groundwater management, with a stronger focus on easing groundwater use.
ISSN:2073-4441
2073-4441
DOI:10.3390/w11091824