The groundwater level varies according to the characteristics and composite materials of aquifer. In this study, specific yield and reaction factor which are the major two hydrogeological parameters in the WTF(Water Table Fluctuation) method were estimated and analyzed spatial characteristics. 8 groundwater level stations which have enough measuring period and high correlation with rainfall in the Hancheon watershed were used. The results showed that specific yield was randomly distributed and reaction factor showed inverse trend with altitude. If the enough data were collected, reaction factor according to altitude in ungauged points could be estimated by using these parameter characteristics.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 지하수위 변동 해석모델 개요
  2.2 반응계수 산정
  2.3. 비산출율 산정
 3. 연구지역
 4. 지하수위 관측자료
 5. 매개변수 최적화
  5.1. 반응계수
  5.2. 비산출율
 6. 고도에 따른 매개변수 특성
  6.1. 고도별 비산출율
  6.2. 고도별 반응계수
 7. 토의 및 결론
 참 고 문 헌

• 김남원(한국건설기술연구원 수자원연구실) | Nam-Won Kim (Water Resources Research Dept., Korea Institute of Construction Technology)
• 김윤정(한국건설기술연구원 수자원연구실) | Youn-Jung Kim (Water Resources Research Dept., Korea Institute of Construction Technology)
• 정일문(한국건설기술연구원 수자원연구실) | Il-Moon Chung (Water Resources Research Dept., Korea Institute of Construction Technology) Corresponding author