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Analysis of Effect of Railway Tunnel Excavation on Water Levels of a National Groundwater Monitoring Station in Mokpo, Korea  

Lee Jin-Yong ((주)지오그린21)
Yi Myeong-Jae ((주)지오그린21)
Choi Mi-Jung ((주)지오그린21 환경기술과)
Hwang Hyoun-Tae ((주)지오그린21 환경기술연구소)
Moon Sang-Ho (한국지질자원연구원 지하수지열연구부)
Won Jong-Ho (한국수자원공사 조사기획처 지하수조사부)
Publication Information
Tunnel and Underground Space / v.16, no.1, 2006 , pp. 73-84 More about this Journal
Abstract
Effects of railway tunnel excavation on water level at a national groundwater monitoring station in Mokpo were evaluated by field investigation and numerical groundwater modeling. The water level at the station has experienced a decline of about 5 m within 1 year since July 2002. From the field investigation, it was concluded that decrease of precipitation oo increase of grundwater use was not reason for the decline. The Mokpo tunnel of new Honam railway, 70 m apart from the national station, appeared most plausible cause and a period of the tunnel excavation generally well matches up that of the drawdown. To quantify the effects of the tunneling on the water level, a groundwater flow modeling was performed. Especially, a most probable conceptual model was optimized through multiple preliminary simulations of various scenarios because there were few hydrogeological data available for the study area. The optimized model was finally used for the quantification. Based on the field investigation and the numerical simulations, it was concluded that the tunnel excavation was one of the most probable reasons for the substantial water level decline but further hydrogeologic investigation and continuous monitoring are essentially required for the surrounding area.
Keywords
National groundwater monitoring stations; Groundwater modeling; Tunnel excavation; Groundwater level; Mokpo-yongdang;
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