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http://dx.doi.org/10.9720/kseg.2018.1.081

Analyzing the Change of Surface Water and Groundwater Systems Caused by Tunnel Construction in Northern Ulsan City  

Jeon, Hang-Tak (Department of Geological Sciences, Pusan National University)
Hamm, Se-Yeong (Department of Geological Sciences, Pusan National University)
Lee, Chung-Mo (Department of Geological Sciences, Pusan National University)
Lim, Woo-Ri (Department of Geological Sciences, Pusan National University)
Yun, Sul-Min (Department of Geological Sciences, Pusan National University)
Park, Heung-Jai (Department of Environmental Engineering, Inje University)
Publication Information
The Journal of Engineering Geology / v.28, no.1, 2018 , pp. 81-99 More about this Journal
Abstract
Excessive groundwater discharge by tunneling and tunnel operation can lead to groundwater exhaustion and ground subsidence. Therefore, it is very important to evaluate environmental impact and to establish mitigation measures of the impact related to tunnel excavation based on hydrogeological and modeling approaches. This study examined the depletion of surface reservoirs and valley water due to tunnel excavation through field survey, water quality analysis, tracer test, and groundwater modeling. As a result of field water quality test, the concentration of chemical constituents in groundwater discharge into the tunnel is slightly higher than that of valley water. By the result of laboratory water analysis, both valley water and the groundwater belong to $Ca^{2+}+HCO_3{^-}$ type. Tracer test that was conducted between the valley at the injection point and the tunnel, indicates valley water infiltration into the ground and flowing out to the tunnel, with maximum electrical conductance changes of $70{\mu}S/cm$ in the first test and of $40{\mu}S/cm$ in the second test. By groundwater modeling, the groundwater discharge rate into the tunnel during tunnel construction is estimated as $4,942m^3/day$ and groundwater level recovers in 3 years from the tunnel completion. As a result of particle tracking modeling, the nearest particle reaches the tunnel after 6 hours and the farthest particle reaches the tunnel after 9 hours, similarly to the case of the field trace test.
Keywords
tunnel construction; groundwater discharge; valley water; tracer test; groundwater modeling;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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