Joint inversion of Wenner and dipole–dipole data to study a gasoline-contaminated soil

Vega, Matı́as de la; Osella, A.; Lascano, Eugenia

doi:10.1016/j.jappgeo.2003.08.020

Cited by 65 publications

(31 citation statements)

References 16 publications

(13 reference statements)

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“…This maintains the signal-to-noise ratio as high as for the Wenner array. To combine the advantages of these two different arrays, the two apparent resistivity data sets are merged into the same inversion process (Loke, 2000;De la Vega et al, 2003).…”

Section: Ertmentioning

confidence: 99%

Characterization of seasonal local recharge using electrical resistivity tomography and magnetic resonance sounding

Descloîtres

Ruiz

Sekhar

et al. 2007

Hydrological Processes

101

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International audienceA groundwater recharge process of heterogeneous hard rock aquifer in the Moole Hole experimental watershed, south India, is being studied to understand the groundwater flow behaviour. Significant seasonal variations in groundwater level are observed in boreholes located at the outlet area indicating that the recharge process is probably taking place below intermittent streams. In order to localize groundwater recharge zones and to optimize implementation of boreholes, a geophysical survey was carried out during and after the 2004 monsoon across the outlet zone. Magnetic resonance soundings (MRS) have been performed to characterize the aquifer and measure groundwater level depletion. The results of MRS are consistent with the observation in boreholes, but it suffers from degraded lateral resolution. A better resolution of the regolith/bedrock interface is achieved using electrical resistivity tomography (ERT). ERT results are confirmed by resistivity logging in the boreholes. ERT surveys have been carried out twice - before and during the monsoon - across the stream area. The major feature of recharge is revealed below the stream with a decrease by 80% of the calculated resistivity. The time-lapse ERT also shows unexpected variations at a depth of 20 m below the slopes that could have been interpreted as a consequence of a deep seasonal water flow. However, in this area time-lapse ERT does not match with borehole data. Numerical modelling shows that in the presence of a shallow water infiltration, an inversion artefact may take place thus limiting the reliability of time-lapse ERT. A combination of ERT with MRS provides valuable information on structure and aquifer properties respectively, giving a clue for a conceptual model of the recharge process: infiltration takes place in the conductive fractured-fissured part of the bedrock underlying the stream and clayey material present on both sides slows down its lateral dissipation

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Section: Ertmentioning

confidence: 99%

Characterization of seasonal local recharge using electrical resistivity tomography and magnetic resonance sounding

Descloîtres

Ruiz

Sekhar

et al. 2007

Hydrological Processes

101

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“…We obtain the electrical resistivity tomography (ERT) section by a joint inversion of the Wenner and dipole-dipole measurements, to improve the depth resolution (de la Vega et al 2003).…”

Section: Resultsmentioning

confidence: 99%

A Seismic Processing Approach Dedicated to Quantitative Characterization of Landfill Heterogeneities

Konstantaki¹,

Ghose²,

Draganov³

et al. 2014

Proceedings

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SUMMARYThe ability to image and quantify the heterogeneity in municipal landfills is crucial for improving the landfill treatment methods, for predicting the behaviour of processes that take place inside the landfills and hence, for estimating the after-care period. Our aim is to image the flow paths inside landfills and to quantify the heterogeneity. We develop a new methodology using both seismic reflection and electrical resistivity methods. We illustrate the possibility of imaging wet and dry pockets inside a landfill and provide density and porosity distributions that are important input parameters to models that predict the behaviour of landfills.

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“…This mode was selected since it represented the best available compromise between vertical and horizontal sensitivity to resistivity changes (Dahlin 1989;De La Vega et al 2003). The apparent-resistivity pseudosections were inverted using the popular commercial code RES2DINV (Loke and Barker, 1996;www.geoelectrical.com), producing series of 2-D cross-sections of inferred resistivities.…”

Section: Methodsmentioning

confidence: 99%

Diesel transport monitoring in simulated unconfined aquifers using miniature resistivity arrays

2009

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The principal aim of this study is to assess the scope of monitoring diesel plume migration in a scaled aquifer model with a miniaturised electrical resistivity array. Respectively 1000 and 500 ml of diesel were injected in both the unsaturated and water-saturated zones of a sand body overlying a clay aquitard, and diesel migration was monitored with a miniature electrode array and an off-the-shelf resistivity meter. Inverted time-lapse electrical resistivity tomography (ERT) data reflect downward and lateral spreading of the diesel plume away from the injection point in the unsaturated zone. Diesel was also imaged to spread upwards and laterally away from the injection point in the saturated zone, as controlled by capillary rise. In both cases later-time ERT images reflected preferential pooling of diesel on the water table, as well as vertical smearing of pooled diesel in response to simulated water-table fluctuations. Repeat fluid electrical conductivity (EC) and dissolved oxygen (DO) measurements validate the observed changes in bulk resistivity caused by both diesel injections. Artefacts introduced by 2D inversion of 3D contaminant transport were abound. Time-lapse ERT imaging of diesel transport is therefore inferred to be feasible and well-suited to complementing conventional techniques of intrusive site investigation, although timelapse 3D or 4D ERT imaging is strongly advocated

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Joint inversion of Wenner and dipole–dipole data to study a gasoline-contaminated soil

Cited by 65 publications

References 16 publications

Characterization of seasonal local recharge using electrical resistivity tomography and magnetic resonance sounding

Characterization of seasonal local recharge using electrical resistivity tomography and magnetic resonance sounding

A Seismic Processing Approach Dedicated to Quantitative Characterization of Landfill Heterogeneities

Diesel transport monitoring in simulated unconfined aquifers using miniature resistivity arrays

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