Dense resistivity and induced polarization profiling for a landfill restoration project at Härlöv, Southern Sweden

Abstract

A resistivity and time-domain induced polarization (IP) survey was conducted at a landfill site under restoration at Här-löv in Southern Sweden. The covering of the landfill had begun some years ago, without keeping precise records of the work done, as is usual in such procedures. The survey was conducted in two steps, on two adjacent areas. First, a number of geoelectrical sections were made on a partly covered area that had been investigated earlier by auger drilling, in order to assist restoration. Then, a second area that should have received its final cover was imaged, and some defects in the cover could be detected and repaired. The resistivity and time-domain IP results were consistent with the results of the geotechnical drillings, and they enabled quasi-continuous mapping along the profiles. Three-dimensional visualization showed the overall consistency of the two-dimensional lines, and helped to generate a global view of the site. In spite of some ambiguities, cover and waste could be distinguished in most cases. In particular, fine-grained cover materials could be clearly distinguished from other cover materials.

Geophysical modelling of the central Skellefte district, Northern Sweden; an integrated model based on the electrical, potential field and petrophysical data

“…Beside resistivity, measurement of the induced polarisation (IP) is normally carried out. With IP measurements it is possible to detect the very conductive minerals even in low concentrations, while those minerals may be missed in the resistivity surveys (Leroux et al, 2007;Loke, 2010).…”

An Evaluation of the Potential of the Geoelectrical Resistivity Method for Mapping Gas Migration in Landfills

“…In recent years resistivity has been used at landfills for various applications like mapping landfill cover (e.g. Leroux et al, 2007), detecting and mapping pollution plumes (e.g. Rosqvist et al 2003), and for studies of moisture migration processes during leachate recirculation at bioreactor landfills (e.g.…”

Mapping landfill gas migration using resistivity monitoring

“…The time for the 50% duty injection cycle was 1 s, which is sufficiently short to make it possible to measure all the lines (3888 measurements) within about 1 h and 45 min, and also sufficiently long to allow for the potential to stabilise. Charge-up and polarisation effects are notoriously important at landfills (Carlson et al 1999;Dahlin et al 2002;Leroux et al 2007) and measuring too hastily can result in underestimating the resistivity. The data have to be processed by inversion before a resistivity image of the studied area can be produced.…”

“…An indication for that is the high induced polarisation usually measured on municipal landfills (see e.g. Carlson et al, 1999;Dahlin et al, 2002;Leroux et al, 2007). Other models such as the equation proposed by Waxman and Smits (1968) might then better describe the electrical resistivity in such materials.…”