• Case for Detection and Prevention of Inflow Section for Contaminant through Annular Space in Borehole, Jeju Island
  • Sung-Ho Song1*·Dongjun Hwangbo2·Jin-Sung Kim3·Won-Seok Yang4

  • 1Rural Research Institute, Korea Rural Community Corporation
    2Jeju Headquarter, Korea Rural Community Corporation
    3Gyungbuk Headquarter, Korea Rural Community Corporation
    4Water Policy Division, Jeju Special Self-Governing Province

  • 제주도 관정 공벽 내 오염물질 유입 구간 탐지 및 차단 사례
  • 송성호1*·황보동준2·김진성3·양원석4

  • 1한국농어촌공사 농어촌연구원
    2한국농어촌공사 제주지역본부
    3한국농어촌공사 경북지역본부
    4제주특별자치도 물정책과

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


Most wells developed in Jeju island before the enactment of the Groundwater Management Ordinance in 2002 are vulnerable to aquifer contamination due to inflow of upper groundwater having the high concentration of nitrate nitrogen, likely due to incomplete grouting in upper section of the wells. Although these wells require entire reinstallation, it is often necessary to rehabilitate the existing wells due to various constraints. Therefore, to identified the inflow section of contaminants, the thermal level sensor (TLS) technique was firstly applied for three wells, which enables to monitor temperature variations in every 50 cm depth. Then, the grouting material was injected to the upper section to prevent the inflow of upper contaminated groundwater into the entire aquifer. By applying TLS technique, it was found that the temperature deviations in the upper groundwater inflow section decreased sharply. Moreover, both the change in the concentration of nitrate nitrogen in the rainy/dry seasons and the average concentrations were found to decrease rapidly after grouting material injection. Consequently, the application of TLS proposed in the study turned out to be appropriate to prevent aquifer contamination.

Keywords: Aquifer contamination, Nitrate nitrogen, Thermal level sensor (TLS), Grouting material injection, Jeju Island

This Article

  • 2022; 27(3): 1-10

    Published on Jun 30, 2022

  • 10.7857/JSGE.2022.27.3.001
  • Received on May 24, 2022
  • Revised on May 26, 2022
  • Accepted on Jun 10, 2022

Correspondence to

  • Sung-Ho Song
  • Rural Research Institute, Korea Rural Community Corporation

  • E-mail: shsong@ekr.or.kr