Applying FDEM, ERT and GPR at a site with soil contamination: A case study

Wang, Tzu Pin; Chen, Chien Chih; Tong, Lun Tao; Chang, Ping; Chen, Yi-Chieh; Dong, Tien Hsing; Liu, Hsin Chang; Lin, Chih Ping; Yang, Kai; Ho, Ching Jen; Cheng, Shih Nan

doi:10.1016/j.jappgeo.2015.07.005

Cited by 57 publications

(23 citation statements)

References 48 publications

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“…Coupling fast EMI surveys with high-resolution electrical resistivity tomography (ERT) has been shown to be one of the most appropriate strategies for characterizing the internal geometry of heterogeneous media, for example, urban fills, contaminated zones and former industrial sites, in a time-and cost-effective manner (Boudreault, Dubé, Chouteau, Winiarski, & Hardy, 2010;Mundell & Byer, 2004;Wang et al, 2015). The different sensitivities of these two methods can improve the discrimination of properties of a complex anthropogenic subsurface (Van De Vijver et al, 2015).…”

Section: Highlightsmentioning

confidence: 99%

Geometrical characterization of urban fill by integrating the multi‐receiver electromagnetic induction method and electrical resistivity tomography: A case study in Poitiers, France

Fraga

Schamper

Noël

et al. 2019

European J Soil Science

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A geophysical survey including electromagnetic induction (EMI) and electrical resistivity tomography (ERT) methods was applied and assessed with a 40‐trench sampling grid to delineate the geometry of an urban fill layer. Classical investigation techniques, such as excavation, offer localized information and suffer from time and budget constraints for environmental assessments. Near‐surface geophysics can provide the required spatial sampling to evaluate the coverage of anthropogenic soils in a time‐effective and quasi‐continuous manner. Fast‐acquisition and high‐spatial‐coverage EMI mapping and high‐vertical‐resolution ERT were implemented to delineate a suspicious urban fill on a 5‐ha site in a suburban region, which will host the buildings of a commercial complex. The ERT data and 40 trench excavations revealed an urban fill thickness ranging from 0.4 to 3.6 m overlying a calcareous substratum. After ERT–EMI calibration, a two‐layer model was introduced into the one‐dimensional (1‐D) inversion of the EMI data for estimating the geometry of the urban fill layer across the study site. The EMI 1‐D inversion results indicated that the predicted urban fill thicknesses were consistent with 70% of the measured values (27 out of 40 excavation sites). Resistive ground, large 3‐D structures and the heterogeneity of urban fill affected the EMI and ERT measurements and increased the difficulty of estimating its spatial distribution. In this paper, we present a measurement protocol that can guide land‐use development and be reproduced to investigate brownfield sites. Highlights Urban soils are poorly characterized by localized investigations for environmental assessments. Spatial EMI data from an urban fill context were calibrated by ERT for thickness inversion. The ERT–EMI inversion reconstructed the urban fill thickness for 70% of the excavation points. Geophysical techniques can reduce uncertainties for site rehabilitation and land‐use development.

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Section: Highlightsmentioning

confidence: 99%

Geometrical characterization of urban fill by integrating the multi‐receiver electromagnetic induction method and electrical resistivity tomography: A case study in Poitiers, France

Fraga

Schamper

Noël

et al. 2019

European J Soil Science

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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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“…As such, infiltration events that result in a significant change in the vadose zone water content or salinity may be detected and visualized in a 3D representation of the water and salinity distribution in the subsurface (Hayley et al, 2009;Brindt et al, 2019). Although the potential for real-time monitoring of contamination processes with geophysical tools is promising (Wang et al, 2015;Comegna et al, 2019), the current state-of-the-art is not efficient enough to identify the transport of pollutants in concentrations that do not significantly alter the medium's electrical conductivity or dielectric properties.…”

Section: Common Methods For Vadose Zone Characterizationmentioning

confidence: 99%

Vadose Zone Monitoring as a Key to Groundwater Protection

Dahan

2020

Front. Water

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Currently, monitoring programs designed for groundwater protection are mainly based on information from observation wells. This, however, creates a paradox, since identification of pollution in well water is clear evidence that the groundwater is already polluted. The poor state of contaminated aquifers all over the world, and the inability, in practice, to fully remediate contaminated aquifers suggest that groundwater monitoring alone has failed to provide the vital information required to prevent groundwater pollution. That said, groundwater pollution initiates on the land surface, and the contaminants have to traverse the unsaturated zone, long before reaching the water table. Therefore, monitoring programs that can provide real-time information on the hydraulic and chemical state of the unsaturated zone are essential for achieving early warnings of pollution potential and providing imperative protection from pollution hazards. Currently, most of the commercially available monitoring technologies are rather limited in their capability to provide early alerts of pollution processes taking place deep in the unsaturated zone, above the water table. Accordingly, monitoring technologies for the unsaturated zone have to be engineered as “off-the-shelf” commercial products, made available for application by practitioners in all fields of hydrology. From scientific and technological points of view, such ambitions are not out of reach. Yet they require an urgent call for a revolutionary shift in monitoring focus, from the groundwater itself to the unsaturated zone above it.

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Applying FDEM, ERT and GPR at a site with soil contamination: A case study

Cited by 57 publications

References 48 publications

Geometrical characterization of urban fill by integrating the multi‐receiver electromagnetic induction method and electrical resistivity tomography: A case study in Poitiers, France

Geometrical characterization of urban fill by integrating the multi‐receiver electromagnetic induction method and electrical resistivity tomography: A case study in Poitiers, France

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

Vadose Zone Monitoring as a Key to Groundwater Protection

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