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Analysis of Groundwater Discharge into the Geumjeong Tunnel and Baseflow Using Groundwater Modeling and Long-term Monitoring

금정터널내의 지하수 유출량과 기저유출량 변화 분석

  • Cheong, Jae-Yeol (Korea Radioactive Waste Agency) ;
  • Hamm, Se-Yeong (Division of Earth Environmental System, Pusan National University) ;
  • Yu, Il-Ryun (Division of Earth Environmental System, Pusan National University) ;
  • Whang, Hak-Soo (Ilshin Engineering) ;
  • Kim, Sang-Hyun (Department of Environmental Engineering, Pusan National University) ;
  • Kim, Moon-Su (Soil and Groundwater Division, National Institute of Environmental Research)
  • 정재열 (한국원자력환경공단) ;
  • 함세영 (부산대학교 지구환경시스템학부) ;
  • 유일륜 (부산대학교 지구환경시스템학부) ;
  • 황학수 (일신엔지니어링) ;
  • 김상현 (부산대학교 환경공학과) ;
  • 김문수 (국립환경과학원 토양지하수과)
  • Received : 2015.10.28
  • Accepted : 2015.12.11
  • Published : 2015.12.29

Abstract

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 $9,796-9,402m^3/day$ with a decreasing tendency.

Keywords

Groundwater modeling;Long-term monitoring;Baseflow;Geumjeong tunnel;Groundwater discharge

Acknowledgement

Supported by : 한국연구재단

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