Time-domain IP and Resistivity Sections Measured at Four Landfills with Different Contents

Leroux, Virginie; Dahlin, Torleif; Rosqvist, Håkan

doi:10.3997/2214-4609.20144851

Cited by 18 publications

(18 citation statements)

References 4 publications

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“…A clear distinctive unit reaching 300-450 mV V −1 enhances the waste layer at about 10 m depth. These results agree with Auken et al (2011), Leroux et al (2010) or Carlson et al (2001), who report a high chargeable unit related to the waste bodies.…”

Section: Landfill Mappingsupporting

confidence: 83%

“…They also show how IP can significantly improve the understanding of the engineering properties of the subsurface relative to resistivity imaging alone. Recently, , and Leroux et al (2010) have shown how the combined use of DC-TDIP could be successfully applied to landfill mapping and characterization, as it usually depicts the waste layer with a relatively high chargeable unit.…”

Section: Introductionmentioning

confidence: 99%

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Application of time domain induced polarization to the mapping of lithotypes in a landfill site

Gazoty

Fiandaca

Pedersen

et al. 2012

Hydrol. Earth Syst. Sci.

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Abstract. A direct current (DC) resistivity and time domain induced polarization (TDIP) survey was undertaken at a decommissioned landfill site situated in Hørløkke, Denmark, for the purpose of mapping the waste deposits and to discriminate important geological units that control the hydrology of the surrounding area. It is known that both waste deposits and clay have clear signatures in TDIP data, making it possible to enhance the resolution of geological structures compared to DC surveys alone. Four DC/TDIP profiles were carried out crossing the landfill, and another seven profiles in the surroundings provide a sufficiently dense coverage of the entire area. The whole dataset was inverted using a 1-D laterally constrained inversion scheme, recently implemented for TDIP data, in order to use the entire decay curves for reconstructing the electrical parameters of the soil in terms of the Cole-Cole polarization model. Results show that it is possible to resolve both the geometry of the buried waste body and key geological structures. In particular, it was possible to find a silt/clay lens at depth that correlates with the flow direction of the pollution plume spreading out from the landfill and to map a shallow sandy layer rich in clay that likely has a strong influence on the hydrology of the site. This interpretation of the geophysical findings was constrained by borehole data, in terms of geology and gamma ray logging. The results of this study are important for the impact of the resolved geological units on the hydrology of the area, making it possible to construct more realistic scenarios of the variation of the pollution plume as a function of the climate change.

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Section: Landfill Mappingsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Application of time domain induced polarization to the mapping of lithotypes in a landfill site

Gazoty

Fiandaca

Pedersen

et al. 2012

Hydrol. Earth Syst. Sci.

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“…The first high‐chargeable area fits the eldest part of the waste, containing sludge and coal. This observation concurs with Leroux et al (2010) who reported a significant difference in the IP signal according to the different types of waste and the organic content in particular. The second high‐chargeable area, more in the south‐west direction, on top of metal spring deposits, also fits a high value of

τ

(above 2 s).…”

Section: Discussionsupporting

confidence: 93%

“…Recently, new applications of induced polarization have emerged in environmental geophysics, including the detection and mapping of a contaminant, both at the field scale (Vanhala 1997; Kemna et al 2004; Sogade et al 2006; Flores‐Oroszco et al 2011; Flores‐Oroszco et al 2012) and at the laboratory scale (Vanhala 1992; Abdel Aal et al 2006; Cassiani et al 2009), or for the geological discrimination of clay contents (Schmutz et al 2011; Gazoty et al 2012). In the time domain, the induced polarization method has been successfully applied to landfill characterization, often displaying a chargeable unit related to the waste body (Carlson et al 2001; Johansson et al 2007; Leroux et al 2010; Gazoty et al 2012). The time‐domain field operation is simple and robust when applying standard multi‐channel acquisition systems.…”

Section: Introductionmentioning

confidence: 99%

Mapping of landfills using time‐domain spectral induced polarization data: the Eskelund case study

Gazoty

Fiandaca

Pedersen

et al. 2012

Near Surface Geophysics

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This study uses time‐domain induced polarization data for the delineation and characterization of the former landfill site at Eskelund, Denmark. With optimized acquisition parameters combined with a new inversion algorithm, we use the full content of the decay curve and retrieve spectral information from time‐domain IP data. Thirteen IP/DC profiles were collected in the area, supplemented by el‐log drilling for accurate correlation between the geophysics and the lithology. The data were inverted using a laterally constrained 1D inversion considering the full decay curves to retrieve the four Cole‐Cole parameters. For all profiles, the results reveal a highly chargeable unit that shows a very good agreement to the findings from 15 boreholes covering the area, where the extent of the waste deposits was measured. The thickness and depth of surface measurements were furthermore validated by el‐log measurements giving in situ values, for which the Cole‐Cole parameters were computed. The 3D shape of the waste body was pinpointed and well‐defined. The inversion of the IP data also shows a strong correlation with the initial stage of the waste dump and its composition combining an aerial map with acquired results.

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“…In addition, Bernstone et al (2000) showed that it was not possible to distinguish between different types of material using electrical resistivity mapping alone and that high uncertainty was present in the results. Nevertheless, a combination of electrical resistivity measurements and induced polarization (Leroux and Dahlin, 2010;Dahlin, 2012) has shown promising results, being able to distinguish between waste and geologic material. However, an advanced inversion method is required for the optimization of the results.…”

Section: Introductionmentioning

confidence: 99%

Imaging scatterers in landfills using seismic interferometry

et al. 2013

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A significant problem with landfills is their aftercare period. A landfill is considered to be safe for the environment only after a relatively long period of time. Until it reaches such a condition, it has to be periodically treated. Not only are treatments very expensive, but they could be dangerous as well; for example, when barriers limiting the waste break. So far, there is no established technique that can predict the leachate and gas-emission potential of a landfill, especially in time-lapse monitoring. This potential depends on the channeling of fluids due to the presence of highdensity waste areas and the redistribution of the channels with time. We propose to use seismic interferometry (SI) applied to active reflection seismics to help improve the image of the waste areas (scatterers) and to monitor the subsurface changes in time. Normally, application of SI to reflection recordings from active sources at the surface would result in an erroneous retrieved result, but secondary illumination of the receivers from strongly scattering subsurface, like a landfill, would remedy this problem. We conduct modeling studies to examine the possible benefits of this approach compared to using the conventional seismic reflection method. We show that the reflections retrieved from SI can be used to obtain a clearer image of the shallower scatterers. In addition, we illustrate that time-lapse monitoring using reflections retrieved by SI shows a more repeatable result than the conventional approach in case of source nonrepeatability.

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Time-domain IP and Resistivity Sections Measured at Four Landfills with Different Contents

Cited by 18 publications

References 4 publications

Application of time domain induced polarization to the mapping of lithotypes in a landfill site

Application of time domain induced polarization to the mapping of lithotypes in a landfill site

Mapping of landfills using time‐domain spectral induced polarization data: the Eskelund case study

Imaging scatterers in landfills using seismic interferometry

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