Three-dimensional inversion of induced polarization data from simulated waste

Weller, Andreas; Frangos, William; Seichter, M.

doi:10.1016/s0926-9851(98)00036-6

Cited by 16 publications

(7 citation statements)

References 19 publications

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“…During the last decade, the scope of time-domain-induced polarization (TDIP) has considerably broadened from mineral exploration to environmental geophysics, e.g., for clay and peat identification and lithological discrimination (Slater and Lesmes, 2002;Slater and Reeve, 2002;Kemna et al, 2004), landfill characterization (Weller et al, 1999;Dahlin et al, 2003) and detection of soil contamination (Vanhala, 1997;Kemna et al, 2004). Furthermore, modern instruments allow multichannel acquisition of induced polarization (IP) data with multicore cables and steel electrodes (Dahlin et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Time-domain-induced polarization: Full-decay forward modeling and 1D laterally constrained inversion of Cole-Cole parameters

et al. 2012

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Time-domain-induced polarization has significantly broadened its field of reference during the last decade, from mineral exploration to environmental geophysics, e.g., for clay and peat identification and landfill characterization. Though, insufficient\ud modeling tools have hitherto limited the use of time-domain induced polarization for wider purposes. For these reasons, a\ud new forward code and inversion algorithm have been developed using the full-time decay of the induced polarization response,\ud together with an accurate description of the transmitter waveform and of the receiver transfer function, to reconstruct the\ud distribution of the Cole-Cole parameters of the earth. The accurate modeling of the transmitter waveform had a strong influence\ud on the forward response, and we showed that the difference between a solution using a step response and a solution using the accurate modeling often is above 100%. Furthermore, the presence of low-pass filters in time-domain-induced polarization instruments affects the early times of the acquired decays (typically up to 100 ms) and has to be modeled in the forward response to avoid significant loss of resolution. The developed forward code has been implemented in a 1D laterally constrained inversion algorithm that extracts the spectral content\ud of the induced polarization phenomenon in terms of the Cole-Cole parameters. Synthetic examples and field examples from Denmark showed a significant improvement in the resolution of the parameters that control the induced polarization response when compared to traditional integral chargeability inversion. The quality of the inversion results has been assessed by a complete uncertainty analysis of the model parameters; furthermore, borehole information confirm the outcomes of the field interpretations. With this new accurate code in situ time-domain induced\ud polarization measurements give access to new applications in environmental and hydrogeophysical investigations, e.g., accurate landfill delineation or on the relation between Cole-Cole and hydraulic parameters

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Section: Introductionmentioning

confidence: 99%

Time-domain-induced polarization: Full-decay forward modeling and 1D laterally constrained inversion of Cole-Cole parameters

et al. 2012

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“…The bottom of the landfill could not be imaged, except maybe with resistivity in the second survey, but even there it is not clear. Similar problems in getting good resolution at depth were encountered at other sites and by Weller et al (1999Weller et al ( , 2000, and may be due to screening effects caused by the low resistive lower part of the waste. It may have been possible to image the bottom of the landfill if it would have been worked with larger electrode spacings, but this is not certain, as there may not be enough contrast in electrical properties.…”

Section: Discussionmentioning

confidence: 55%

“…Since the results achieved with the time-domain method are good enough, spectral IP is viewed as not necessary. Weller et al (1999Weller et al ( , 2000 have observed increased phase angles in waste containing disseminated metals and various contaminants. Several authors (among others Vanhala 1997) have reported distortions in the phase spectra due to organic contamination changing with time.…”

Section: Distinguishing Between Cover and Wastementioning

confidence: 99%

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

2007

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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.

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“…In our case, the inverted sections showed a high chargeability M 0 , in the range of several hundreds of mV/V, fitting the expected dump site location, as validated by borehole comparison. The high M 0 magnitude is likely related to the metallic content of common refuse, disseminated as small and discontinuous particles (Weller et al 2000).…”

Section: Discussionmentioning

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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Three-dimensional inversion of induced polarization data from simulated waste

Cited by 16 publications

References 19 publications

Time-domain-induced polarization: Full-decay forward modeling and 1D laterally constrained inversion of Cole-Cole parameters

Time-domain-induced polarization: Full-decay forward modeling and 1D laterally constrained inversion of Cole-Cole parameters

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

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

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