Groundwater contamination monitoring with multichannel electrical and electromagnetic methods

Buselli, G.; Lu, Kanglin

doi:10.1016/s0926-9851(01)00055-6

Cited by 122 publications

(46 citation statements)

References 8 publications

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“…Driven by the need for a cost-effective and a more continuous characterisation of contaminated groundwater, growing interest has emerged very recently in the use of non-intrusive geophysical methods (Aristodemou and Thomas-Betts, 2000;Yaramanci, 2000;Buselli and Lu, 2001;Kemna et al, 2002;Nimmer and Osiensky, 2002). In the present study, piezometric level data, geochemical measurements and geo-electrical methods (self-potential and electrical resistivity) have been combined in mapping the redox potential and the electrical conductivity in the contaminant plume associated with the migration of leachate from the municipal landfill of Entressen, in south-east France (Fig.…”

Section: Introductionmentioning

confidence: 99%

Groundwater redox conditions and conductivity in a contaminant plume from geoelectrical investigations

Naudet

Revil

Rizzo

et al. 2004

Hydrol. Earth Syst. Sci.

201

163

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Accurate mapping of the electrical conductivity and redox potential of groundwater is important in delineating the shape of a contaminant plume. A map of redox potential in an aquifer is indicative of biodegradation of organic matter and of concentrations of redox-active components; a map of electrical conductivity provides information on the mineralisation of the groundwater. Both maps can be used to optimise the position of pumping wells for remediation. The self-potential method (SP) and electrical resistivity tomography (ERT) have been applied to the contaminant plume associated with the Entressen landfill in south-east France. The self-potential depends on groundwater flow (electrokinetic contribution) and redox conditions (electro-redox contribution). Using the variation of the piezometric head in the aquifer, the electrokinetic contribution is removed from the SP signals. A good linear correlation (R²=0.85) is obtained between the residual SP data and the redox potential values measured in monitoring wells. This relationship is used to draw a redox potential map of the overall contaminated site. The electrical conductivity of the subsoil is obtained from 3D-ERT analysis. There is good linear correlation (R²=0.91) between the electrical conductivity of the aquifer determined from the 3D-ERT image and the conductivity of the groundwater measured in boreholes. This indicates that the formation factor is nearly homogeneous in the shallow aquifer at the scale of the ERT. From this correlation, a map of the pore water conductivity of the aquifer is obtained.

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Section: Introductionmentioning

confidence: 99%

Groundwater redox conditions and conductivity in a contaminant plume from geoelectrical investigations

Naudet

Revil

Rizzo

et al. 2004

Hydrol. Earth Syst. Sci.

201

163

View full text Add to dashboard Cite

show abstract

“…Investigative resistivity surveys on embankments to detect structural defects or anomalous seepage are fairly widespread ͑Abuzeid, 1994; Engelbert et al, 1997;Titov et al, 2000;Van Tuyen et al, 2000;Buselli and Lu, 2001;Panthulu et al, 2001;Voronkov et al, 2004͒. However, modeling studies to find out more about typical effects from dam geometries is less common.…”

Section: Introductionmentioning

confidence: 99%

2.5D resistivity modeling of embankment dams to assess influence from geometry and material properties

2006

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Repeated resistivity measurement is a potentially powerful method for monitoring development of internal erosion and anomalous seepage in earth embankment dams. This study is part of a project to improve current longterm monitoring routines and data interpretation and increasing the understanding when interpreting existing data. This is accomplished by modeling various occurrences typical of embankment structures using properties from two rockfill embankment dams with central till cores in the north of Sweden. The study evaluates the influence from 3D effects created by specific dam geometry and effects of water level fluctuations in the reservoir. Moreover, a comparison between different layout locations is carried out, and detectability of internal erosion scenarios is estimated through modeling of simulated damage situations. Software was especially developed to model apparent resistivity for geometries and material distributions for embankment dams. The model shows that the 3D effect from the embankment geometry is clearly significant when measuring along dam crests. For dams constructed with a conductive core of fine-grained soil and high-resistive rockfill, the effect becomes greatly enhanced. Also, water level fluctuations have a clear effect on apparent resistivities. Only small differences were found between the investigated arrays. A layout along the top of the crest is optimal for monitoring on existing dams, where intrusive investigations are normally avoided, because it is important to pass the current through the conductive core, which is often the main target of investigation. The investigation technique has proven beneficial for improving monitoring routines and increasing the understanding of results from the ongoing monitoring programs. Although the technique and software are developed for dam modeling, it could be used for estimation of 3D influence on any elongated structure with a 2D cross section.

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“…This type of investigations has been conducted many times as regard to mine drainage (e.g. Abraheem et al 1990;Buselli and Lu 2001;Yuval and Oldenburg 1996). The technique is similar to the one used to detect leakage from landfills.…”

Section: Using Resistivity Measurements For Dam Safety Evaluation At mentioning

confidence: 99%

Using resistivity measurements for dam safety evaluation at Enemossen tailings dam in southern Sweden

Sjödahl¹,

Dahlin²,

Johansson³

2005

Environ Geol

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Groundwater contamination monitoring with multichannel electrical and electromagnetic methods

Cited by 122 publications

References 8 publications

Groundwater redox conditions and conductivity in a contaminant plume from geoelectrical investigations

Groundwater redox conditions and conductivity in a contaminant plume from geoelectrical investigations

2.5D resistivity modeling of embankment dams to assess influence from geometry and material properties

Using resistivity measurements for dam safety evaluation at Enemossen tailings dam in southern Sweden

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