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정재열 ( Jae Yeol Cheong ),함세영 ( Se Yeong Hamm ),유일륜 ( Il Ryun Yu ),황학수 ( Hak Soo Whang ),김상현 ( Sang Hyun Kim ),김문수 ( Moon-su Kim ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.12
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.