Use the Electrical Resitivity Image as a Non-Invasive Method to Study the Characterization of Landfills

摘要

Electrical resistivity imaging is used increasingly as a geophysical exploration technique in contaminated land research. The presented work demonstrates the efficiency of electrical imaging in monitoring pollution plume evolution under the landfill and geological mapping around the landfill, employing electrical resistivity and time domain induced polarization (IP) methods. Nine electrical resistivity imaging (ERI) surveys were conducted in the summer of 2005, in which five surveys around the landfill mapped the geology and four on the landfill mapped the leachate distribution. The ERI survey coupled with ground truthing by borehole logging revealed the geology around the landfill has a clay layer varying 5 to 20 m followed by a sand zone with a varying thickness of 5 to 40 m, followed by till. The ERI conducted north and south of the landfill indicated the presence of large areas of leachate accumulation with low resistivity values of less than 8 m and IP values greater than 20 mV/V measured in terms of chargeability. The ERI profile conducted at the north top of the landfill mapped the presence of a high resistive zone at 30 m below the surface, possibly due to the high organic load of the backfilled oil disposal pit.