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http://dx.doi.org/10.7857/JSGE.2012.17.2.028

The Influence of the Surrounding Groundwater by Groundwater Discharge from the Subway Tunnel at Suyeong District, Busan City  

Chung, Sang-Yong (Department of Earth Environmental Sciences, Pukyong National University)
Kim, Tae-Hyung (Department of Earth Environmental Sciences, Pukyong National University)
Park, Nam-Sik (School of Civil Engineering, Dong-A University)
Publication Information
Journal of Soil and Groundwater Environment / v.17, no.2, 2012 , pp. 28-36 More about this Journal
Abstract
This study carried out several kinds of investigations such as geology, hydrogeology, groundwater level and quality, surface-water quality, and the quantity and quality of groundwater discharge from the subway to identify the causes of groundwater contamination around the subway tunnel at Suyeong District in Busan City. Geostatistical analyses were also conducted to understand the characteristics of groundwater level and quality distributions. There are Kwanganri Beach and Suyeong River in the study area, which are basically influenced by seawater. The total quantities of groundwater utilization and groundwater discharge from the subway tunnel in Suyeong District are 2,282,000 $m^3$/year, which is 2.4 times larger than the sustainable development yield of groundwater. The lowest groundwater level around the subway tunnel is about 32 m below the mean sea-level. The large drawdown of groundwater led to the inflow of seawater and salinized river water toward the subway tunnel, and therefore the quality of groundwater didn't satisfy the criteria of potable, domestic, agricultural and industrial uses. Distribution maps of groundwater level and qualities produced by kriging were very useful for determining the causes of groundwater contamination in the study area. The distribution maps of electrical conductivity, chloride and sulfate showed the extent of seawater intrusion and the forceful infiltration of the salinized Suyeong River. This study revealed that seawater and salinized river water infiltrated into the inland groundwater and contaminated the groundwater around the subway tunnel, because the groundwater level was seriously drawdowned by groundwater discharge from the subway tunnel. The countermeasure for the minimization of groundwater discharge from the subway tunnel is necessary to prevent the groundwater obstacles such as groundwater depletion, groundwater-quality deterioration, and land subsidence.
Keywords
Seawater; Groundwater discharge; Sustainable development yield; Groundwater drawdown; Kriging; Groundwater obstacles;
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Times Cited By KSCI : 2  (Citation Analysis)
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