When constructing tunnels, it is important to understand structural, geological and hydrogeological conditions. Geumgeong tunnel that has been constructed in Mt. Geumjeong for the Gyeongbu express railway induced rapid drawdown of groundwater in the tunnel construction area and surroundings. This study aimed to analyze groundwater flow system and baseflow using long-term monitoring and groundwater flow modeling around Geumgeong tunnel. Field hydraulic tests were carried out in order to estimate hydraulic conductivity, transmissivity, and storativity in the study area. Following the formula of Turc and groundwater flow modeling, the annual evapotranspiration and recharge rate including baseflow were estimated as 48% and 23% compared to annual precipitation, respectively. According to the transient modeling for 12 years after tunnel excavation, baseflow was estimated as 9,796 - 9,402 m3/day with a decreasing tendency.

Abstract
 1. 서론
 2. 연구방법
  2.1. 지하수 함양률 산정
  2.2. 지하수 모델링 개요
 3. 지하수위 변동 및 지하수 유동 분석
 4. 지하수 평형
  4.1. 지하수 함양량
  4.2. 증발산량
  4.3. 금정산성마을의 지하수 사용량
  4.4. 금정터널내 유출량
  4.5. 동래온천의 온천수 사용량 및 수위
  4.6. 하천유량
  4.7. 지하수 수지
 5. 지하수 유동 모델링
  5.1. 입력변수
  5.2. 정상류 모델링
  5.3. 부정류 모델링
 6. 결 론
 REFERENCES

• 김문수(국립환경과학원 토양지하수과) | Moon-Su Kim (Soil and Groundwater Division, National Institute of Environmental Research)
• 김상현(부산대학교 환경공학과) | Sang-Hyun Kim (Department of Environmental Engineering, Pusan National University)
• 황학수(일신엔지니어링) | Hak-Soo Whang (Ilshin Engineering)
• 유일륜(부산대학교 지구환경시스템학부) | Il-Ryun Yu (Division of Earth Environmental System, Pusan National University)
• 함세영(부산대학교 지구환경시스템학부) | Se-Yeong Hamm (Division of Earth Environmental System, Pusan National University) Corresponding author
• 정재열(한국원자력환경공단) | Jae-Yeol Cheong (Korea Radioactive Waste Agency)