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http://dx.doi.org/10.7582/GGE.2013.16.3.154

An Electrical Resistivity Survey for the Characterization of Alluvial Layers at Groundwater Artificial Recharge Sites  

Won, Byeongho (Geologic Environment Division, Korean Institute of Geoscienceand Mineral Resources)
Shin, Jehyun (Geologic Environment Division, Korean Institute of Geoscienceand Mineral Resources)
Hwang, Seho (Geologic Environment Division, Korean Institute of Geoscienceand Mineral Resources)
Hamm, Se-Yeong (Department of Geological Sciences, Pusan National University)
Publication Information
Geophysics and Geophysical Exploration / v.16, no.3, 2013 , pp. 154-162 More about this Journal
Abstract
Vertical electrical sounding and 2D electrical resistivity survey were applied for evaluating the characteristics of alluvial layers at a groundwater artificial recharge site. The fine particles in alluvial layer, main target layer of groundwater artificial recharge, may cause clogging phenomena. In this case, electrical resistivity method is an effective technique to verify the spatial distribution of low-resistivity layers, such as saturated silts and clays. On the other hand, much attention should be paid to interpret the resistivity data in unconsolidated layers, because thick clayey overburden sometimes produces a masking effect on underlying interbedded resistive sands and gravels. Considering these points, we designed 35 points arranged in a grid form for vertical electrical sounding and 10 lines for 2D electrical resistivity survey, and concentrated our effort on enhancing the vertical and horizontal resolution of resistivity images. According to the results, 15 meters thick layers consisting of sands and gravels are located in 30 meters below ground. And the spatial distribution of silts and clays are mapped, which may cause clogging. Consequently, this approach can contribute to design and determine the location and depth of injection and observation wells for groundwater artificial recharge.
Keywords
Groundwater artificial recharge; Vertical electrical sounding; 2D electrical resistivity survey; Alluvial layer;
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