In this study, the hydraulic gradient was calculated using the groundwater level and rainfall observed in the Hyogyo-ri area for a year, and the change in the hydraulic gradient according to the rainfall was analyzed. It was found that the groundwater level increased as the rainfall increased in all groundwater wells in the research site, and the groundwater level rise decreased as the altitude of the groundwater well increased. The hydraulic gradient in the research site ranged from 0.016 to 0.048, decreasing during rainfall and increasing after the end of the rainfall. As the rainfall increased, the groundwater level rise in the low-altitude area was more than the high-altitude area, and the hydraulic gradient decreased due to the difference in groundwater level rise according to the altitude. Through this study, it was found that the influence of rainfall is dominant for the fluctuation of the hydraulic gradient in the unconfined aquifer.

Abstract
1. 서 론
2. 연구 방법
    2.1. 연구부지 및 지하수위 관측
    2.2. 대수층의 수리경사 및 주흐름방향 산정 방법
    2.3. 지형 고도와 강우에 의한 수리경사 변동
3. 결과 및 고찰
    3.1. 강우와 지하수위 변동 분석
    3.2. 강우에 따른 지하수 수리경사 변동 분석
4. 결 론
감사의 글
REFERENCES

• 박경덕(부경대학교 지질환경연구소) | Kyoung-deok Park (Institute of Environmental Geosciences, Pukyong National University, Busan 48513, Korea)
• 강동환(부경대학교 지질환경연구소) | Dong-hwan Kang (Institute of Environmental Geosciences, Pukyong National University, Busan 48513, Korea) Corresponding Author
• 조원기(온실가스종합정보센터) | Won Gi Jo (Greenhouse Gas Inventory and Research Center, Chungcheongbuk-do 28166, Korea)
• 신인규(국립환경과학원) | In-Kyu Shin (National Institute of Environmental Research, Incheon 22689, Korea)
• 오윤영(국립환경과학원) | Yun-Yeong Oh (National Institute of Environmental Research, Incheon 22689, Korea)
• 김문수(국립환경과학원) | MoonSu Kim (National Institute of Environmental Research, Incheon 22689, Korea)
• 김현구(국립환경과학원) | Hyun-Koo Kim (National Institute of Environmental Research, Incheon 22689, Korea)