Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
권호 표지

Characteristics of Aquifer System and Change of Groundwater Level due to Earthquake in the Western Half of Jeju Island

제주도 서반부의 대수층 체계와 지진에 의한 지하수위 변동 특성

  • Ok, Soon-Il (Division of Earth Environmental System, Pusan National University) ;
  • Hamm, Se-Yeong (Division of Earth Environmental System, Pusan National University) ;
  • Kim, Bong-Sang (Jinsan Engineering, Jeju Special Self-Governing Province) ;
  • Cheong, Jae-Yeol (Korea Radioactive Waste Management Corporation) ;
  • Woo, Nam-Chil (Department of Earth System Sciences, Yonsei University) ;
  • Lee, Soo-Hyoung (Division of Earth Environmental System, Pusan National University) ;
  • Koh, Gi-Won (Institute of Environmental Resources Research, Jeju Special Self-Governing Province) ;
  • Park, Yun-Seok (Institute of Environmental Resources Research, Jeju Special Self-Governing Province)
  • 옥순일 (부산대학교 지구환경시스템학부) ;
  • 함세영 (부산대학교 지구환경시스템학부) ;
  • 김봉상 ((주)진산) ;
  • 정재열 (한국방폐물관리공단) ;
  • 우남칠 (연세대학교 지구시스템과학과) ;
  • 이수형 (부산대학교 지구환경시스템학부) ;
  • 고기원 (제주특별자치도 환경자원연구원) ;
  • 박윤석 (제주특별자치도 환경자원연구원)
  • Received : 2010.07.09
  • Accepted : 2010.08.09
  • Published : 2010.08.28
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Abstract

This study characterizes aquifer system and hydrogeologic property in the western half of Jeju Island where wells were drilled for regional water supply in three sub-areas (northwestern, western, and southwestern sub-areas). The aquifer system of the northwestern sub-area is largely composed of upper high-permeability layer, upper low-permeability layer, lower high-permeability layer, and lower low-permeability layer. On the other hand, the aquifer systems of the western and southwestern sub-areas are mostly composed of upper low-permeability layer, high-permeability layer, and lower low-permeability layer. Transmissivity and specific capacity decrease in the order of the northwestern, western, and southwestern sub-areas. The relationship between specific capacity and the top surface of tuff is negative with a high correlation coefficient of -0.848, indicating that the tuff acts as the bottom of the aquifer. Groundwater level change due to the 2004 Sumatra earthquake is an average of 23.74 cm in the northwestern sub-area, an average of 9.48 cm in the western sub-area, and none in the southwestern sub-area. Further, it is found that groundwater change due to the earthquake has a positive relationship with transmissivity and specific capacity.

본 연구는 서반부지역(북서부 소지역, 서부 소지역, 남서부 소지역)에 광역상수도용 수원지 개발을 위하여 굴착된 지하수공을 중심으로 대수층 체계를 분류하고, 수리지질 특성을 규명하였다. 북서부 소지역의 대수층 체계는 상부 투수층-상부 저투수층-하부 투수층-하부 저투수층으로 구성되고, 서부 소지역과 남서부 소지역의 대수층 체계는 상부 저투수층-투수층-하부 저투수층으로 구성된다. 투수량계수와 비양수량은 북서부 소지역, 서부 소지역, 남서부 소지역의 순으로 낮아진다. 비양수량과 응회암의 산출 고도는 비교적 높은 반비례 관계(상관계수 -0.848)를 보이며, 이는 응회암이 대수층의 밑바닥 역할을 하기 때문으로 판단된다. 3개 소지역에 대해서 2004년 수마트라 지진에 의한 지하수위 변동 분석결과, 북서부 소지역에서 평균 23.74 cm로 가장 크며, 서부 소지역에서는 평균 9.48 cm이고, 남서부 소지역 에서는 지하수위 변동이 나타나지 않았다. 그리고 지진에 의한 지하수위 변화는 투수량계수 및 비양수량과 정비례관계를 가지는 것으로 나타났다.

Keywords

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