This study analyzed fluctuations of ground water level of ground water wells developed in Seongsan watershed of Jeju Island until 2013 using MODFLOW, a numerical analysis model. Ground water level shows greater fluctuations from increase of pump capacity compared to the number of ground water wells. The development of ground water at the top of watershed was found to have direct influence on ground water level. Ground water wells developed until 2013 were used to continue pumping for 50 days, and ground water level of coastal region was reduced below 50% compared to the standard water level. In addition, the range of fluctuation of water level was large in the east coast region, which represents the direction of flow of ground water.

1. 서론
 2. 연구방법
  2.1. 대상유역
  2.2. 지하수 개발현황
  2.3. 정상류 상태의 지하수흐름
 3. 결과 및 고찰
  3.1. 지하수 개발에 따른 수위변화
  3.2. 양수기간에 따른 수위변화
 4. 결론
 R
EFERENCES

• 김민철(제주대학교 토목공학과, Department of Civil Engineering, Jeju National University) | Min-Chul Kim
• 양성기(제주대학교 토목공학과, Department of Civil Engineering, Jeju National University) | Sung-Kee Yang Corresponding author
• 이준호(제주대학교 토목공학과, Department of Civil Engineering, Jeju National University) | Jun-ho Lee