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http://dx.doi.org/10.5467/JKESS.2011.32.6.537

Resistivity Imaging Using Borehole Electrical Resistivity Tomography: A Case of Land Subsidence in Karst Area Due to the Excessive Groundwater Withdrawal  

Song, Sung-Ho (Rural Research Institute, Korea Rural Community Corporation)
Lee, Gyu-Sang (Rural Research Institute, Korea Rural Community Corporation)
Um, Jae-Youn (Rural Research Institute, Korea Rural Community Corporation)
Suh, Jung-Jin (Office of Environmental Geology, Korea Rural Community Corporation)
Publication Information
Journal of the Korean earth science society / v.32, no.6, 2011 , pp. 537-547 More about this Journal
Abstract
Electrical resistivity tomography surveys using boreholes were applied to reveal the cause of a catastrophic land subsidence accompanied by the excessive groundwater withdrawal in urban karst area and to map the connectivity of disseminated cavities over the study area. In order to understand the hydrogeological characteristics, resistivity using exsitu core samples, groundwater level for five boreholes, and hydraulic conductivity using slug test were measured. The hydraulic conductivity variation ranging from 0.8 to $9.3{\times}10^{-4}\;cm/s$ for five boreholes and a gentle slope of groundwater level indicated that there is no significant characteristics of hydraulic heterogeneity. Core samples of the lime-silicated rock were classified as three groups including cracked, weathered, and fresh and measured the resistivity values ranged from 103 to 161, 218 to 277, and 597 to 662 ohm-m, respectively. Drilling results that showed the cavity filled with clay materials and tomogram for this region indicated resistivity value lower than 50 ohm-m. From the inverted resistivity results for each section with five boreholes, cavity and fractured layer were distributed along the depth between 10 and 20 m overall area and cavities ranging from 4 to 6 m filled with clay materials.
Keywords
cavity in karst area; land subsidence; electrical resistivity tomography; hydraulic conductivity;
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Times Cited By KSCI : 3  (Citation Analysis)
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