Use of electrical tomography methods to determinate the extension and main migration routes of uncontrolled landfill leachates in fractured areas

Casado, Ismael; Himi, Mahjoub; Lovera, R.; Fernández, Jesús García; Casas, Albert

doi:10.1016/j.scitotenv.2014.11.068

Cited by 40 publications

(13 citation statements)

References 12 publications

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“…Non-invasive geophysical methods have been used extensively to investigate the composition and structure of the subsurface, and in particular electrical resistivity tomography (ERT) has been used for studying the landfills and related contaminated sites (Casado et al, 2015;Konstantaki et al, 2015;Slater and Binley, 2006;Vargemezis et al, 2015;Wang et al, 2015). The application of ERT for the study of the landfill sites addresses two main complimentary issues: (1) Mapping of extent of landfill sources (Bernstone et al, 2000;Ogilvy et al, 2002); and (2) Identification and mapping of landfill leachate plumes (Acworth and Jorstad, 2006;Perozzi and Holliger, 2008;Zume et al, 2006).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Detailed landfill leachate plume mapping using 2D and 3D electrical resistivity tomography - with correlation to ionic strength measured in screens

Maurya

Rønde

Fiandaca

et al. 2017

Journal of Applied Geophysics

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Detailed landfill leachate plume mapping using 2D and 3D electrical resistivity tomography - with correlation to ionic strength measured in screens

Maurya

Rønde

Fiandaca

et al. 2017

Journal of Applied Geophysics

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“…ERT is a non‐invasive method that makes it possible to differentiate among materials of different resistivities. It is widely used in environmental studies to help estimate the location and extent of pollution sources, different subsurface materials, such as buried waste, unconsolidated sediments (gravel), and groundwater (Casado, Mahjoub, Lovera, Fernández, & Casasa, ; Georgaki et al, ) within an alluvial plain (Breg Valjavec, ; Casado et al, ; Dumont, Robert, Marck, & Nguyen, ; Georgaki et al, ). In this study, a SuperSting R1/IP device was used, with five cables—each with four electrodes, to produce 2‐D resistivity profiles of the subsurface.…”

Section: Methodsmentioning

confidence: 99%

“…Generally, where horizontal structures are significant, a Schlumberger or Wenner array is applied. However, due to the importance of vertical penetration and high resolution in the present case, a dipole–dipole array was used (Breg Valjavec, ; Casado et al, ; Georgaki et al, ). We tested all three at each profile.…”

Section: Methodsmentioning

confidence: 99%

Environmental risk resulting from historical land degradation in alluvial plains considered for dam planning

2018

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Land degradation of alluvial plains is an environmental risk for groundwater contamination, stemming from the mobilization of contaminants that can occur from wastefilled gravel pits. This risk can be increased by river damming and consequential rises in groundwater levels. The presence and characteristics of former historical land degradation of alluvial plains should therefore be considered when planning hydroelectric projects. The aim of this study was to assess the hydrological and environmental impacts of the planned damming of the Sava River on the groundwater, which is the drinking water source for the Slovenian capital Ljubljana. It introduces an integrative approach for determining the characteristics of old waste-filled gravel pits with stereo image processing of historical aerial photographs and electrical resistivity tomography (ERT) in combination with hydrological modelling. Thirty gravel pits in the study area (17 km 2 ) were identified by stereo image analysis, and three were selected to test results in the field using non-invasive ERT. Integrating this information with the results of hydrological modelling, we assessed the risk of groundwater contamination from the scenario of the planned damming of the River Sava. The results indicate that the thickness of the unsaturated zone below the identified gravel pits will be reduced by an average of 4 m at median groundwater level conditions during damming, which will increase the vulnerability of groundwater to contamination. KEYWORDS electrical resistivity tomography, groundwater management, hydrological modelling, hydropower planning, stereo image processing

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“…If the subsurface electrical properties remain constant over time, time-lapse measurements can track changes in subsurface conductivity associated with an induced or natural input (Singha et al 2014). ERI and time-lapse ERI have been extensively used to image shallow groundwater movement (Koestel et al 2009;Doetsch et al 2012), groundwater contaminant migration (Casado et al 2015;Kuras et al 2016;Park et al 2016), contaminant remediation (Ramirez et al 1993;Daily and Ramirez 1995;Halihan et al 2011;Johnson et al 2015), and solute transport (Slater et al 2000;Kemna et al 2002;Singha and Gorelick 2005;Muller et al 2010). Permanent ERI installations have been used to monitor hydraulic processes in porous media (e.g., Kuras et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Feasibility Assessment of Long‐Term Electrical Resistivity Monitoring of a Nitrate Plume

2019

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Long‐term monitoring solutions at contaminated sites are necessary to track plume migration and evaluate the performance of remediation efforts. Electrical resistivity imaging (ERI) can potentially provide information about plume dynamics; however, the feasibility and likelihood of success are seldom evaluated before conducting a field study. Coupling flow and transport models with geoelectrical models provide a powerful way to assess the potential effectiveness of an actual ERI field campaign. We present a coupled approach for evaluating the feasibility of monitoring nitrate migration and remediation using 4D time‐lapse ERI at a legacy nuclear waste facility. This kilometer‐scale study focuses on depths below the water table (∼70 m). A flow and transport model is developed to perform simulations of nitrate migration and removal via a hypothetical pump‐and‐treat system. A tracer injection is also simulated at the leading edge of the nitrate plume to enhance the conductivity contrast between the native subsurface and the groundwater fluids. Images of absolute bulk conductivity provide limited information concerning plume migration while time‐lapse difference images, which remove the static effects of geology, provide more useful information concerning plume dynamics over time. A spatial moment analysis performed on flow and transport and ERI models matches well during the tracer injection; however, inversion regularization smoothing otherwise limits the value in terms of locating the center of mass. We find that the addition of a tracer enables ERI to characterize plume dynamics during pump‐and‐treat operations, and late‐time ERI monitoring provides a conservative estimate of nitrate plume boundaries in this synthetic study.

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Use of electrical tomography methods to determinate the extension and main migration routes of uncontrolled landfill leachates in fractured areas

Cited by 40 publications

References 12 publications

Detailed landfill leachate plume mapping using 2D and 3D electrical resistivity tomography - with correlation to ionic strength measured in screens

Detailed landfill leachate plume mapping using 2D and 3D electrical resistivity tomography - with correlation to ionic strength measured in screens

Environmental risk resulting from historical land degradation in alluvial plains considered for dam planning

Feasibility Assessment of Long‐Term Electrical Resistivity Monitoring of a Nitrate Plume

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