Saltwater Intrusion Monitoring Evaluation through Automatic Vertical Line Method in a Costal Aquifer of the Eastern Part of Jeju Island

Hojune Jang; Kyoochul Ha; Inuk Hwang; Gee-Pyo Kim; Won-Bae Park

doi:10.7857/JSGE.2021.26.3.001

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Saltwater Intrusion Monitoring Evaluation through Automatic Vertical Line Method in a Costal Aquifer of the Eastern Part of Jeju Island 수직 라인 관측시스템을 이용한 제주 동부 해안대수층에서 해수침투 모니터링 평가

30 June 2021. pp. 1-13

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Abstract

Groundwater monitoring is commonly practiced with real-time sensors placed in several depth spots in aquifer. However, this method only provides monitoring data at the point where the sensors are installed. In this study, we developed a vertical line monitoring system (VLMS) that can provide continuous data of groundwater parameters along the vertical depth. The device was installed in a well located on the coast of the eastern part of Jeju island to monitor electrical conductivity, temperature, salinity, pH, dissolved oxygen, and oxidation-reduction potential over approximately 3 months from September 11 to December 3, 2020. The results indicated that the groundwater levels fluctuated with the tidal change of seawater level, and the upper and lower boundaries of the freshwater and saltwater zone in the groundwater were located at below 16 m and 36 m of mean sea level, respectively. There was a large variation in EC values during the high tide and temperature change was the greatest during flow tide. Although further investigation is needed for improvement of the device to obtain more accurate and reliable data, the device has a potential utility to provide fundamental data to understand the seawater intrusion and transport mechanisms in coastal aquifers.

Keywords

Saltwater intrusion

Monitoring

Vertical line method

Jeju island

Coastal aquifer

References

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Information

Publisher :The Korean Society of Soil and Groundwater Environment
Publisher(Ko) :한국지하수토양환경학회
Journal Title :Journal of Soil and Groundwater Environment
Journal Title(Ko) :지하수토양환경
Volume : 26
No :3
Pages :1-13
Received Date : 2021-04-23
Revised Date : 2021-05-07
Accepted Date : 2021-05-31
DOI :https://doi.org/10.7857/JSGE.2021.26.3.001

Journal of Soil and Groundwater Environment ISSN:1598-6438(Print) 2287-8831(Online) 지하수토양환경

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