Investigating changes of electrical characteristics of the saturated zone affected by hazardous organic waste

Frohlich, Reinhard K.; Barosh, Patrick J.; Boving, Thomas B.

doi:10.1016/j.jappgeo.2007.12.001

Cited by 34 publications

(9 citation statements)

References 28 publications

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“…This observation of a high resistive layer associated with LNAPL contamination overlying a conductive groundwater plume (probably the result of biodegradation) has also been documented by Benson et al (1997) and Frohlich et al (2008). Although no comprehensive chemical and biological data was provided, the results suggest that high resistivity anomalies associated with the presence of LNAPLs can persist even after decades of contamination.…”

Section: Non Conductive Geophysical Signatures Associated With Long-tsupporting

confidence: 55%

Geophysical Signatures of Microbial Activity at Hydrocarbon Contaminated Sites: A Review

Atekwana

2009

Surv Geophys

147

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Microorganisms participate in a variety of geologic processes that alter the chemical and physical properties of their environment. Understanding the geophysical signatures of microbial activity in the environment has resulted in the development of a new sub-discipline in geophysics called ''biogeophysics''. This review focuses primarily on literature pertaining to biogeophysical signatures of sites contaminated by light non-aqueous phase liquids (LNAPL), as these sites provide ideal laboratories for investigating microbialgeophysical relationships. We discuss the spatial distribution and partitioning of LNAPL into different phases because the physical, chemical, and biological alteration of LNAPL and the subsequent impact to the contaminated environment is in large part due to its distribution. We examine the geophysical responses at contaminated sites over short time frames of weeks to several years when the alteration of the LNAPL by microbial activity has not occurred to a significant extent, and over the long-term of several years to decades, when significant microbial degradation of the LNAPL has occurred. A review of the literature suggests that microbial processes profoundly alter the contaminated environment causing marked changes in the petrophysical properties, mineralogy, solute concentration of pore fluids, and temperature. A variety of geophysical techniques such as electrical resistivity, induced polarization, electromagnetic induction, ground penetrating radar, and self potential are capable of defining the contaminated zones because of the new physical properties imparted by microbial processes. The changes in the physical properties of the contaminated environment vary spatially because microbial processes are controlled by the spatial distribution of the contaminant. Geophysical studies must consider the spatial variations in the physical properties during survey design, data analysis, and interpretation. Geophysical data interpretation from surveys conducted at LNAPL-contaminated sites without a microbial and geochemical context may lead to ambiguous conclusions.

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Section: Non Conductive Geophysical Signatures Associated With Long-tsupporting

confidence: 55%

Geophysical Signatures of Microbial Activity at Hydrocarbon Contaminated Sites: A Review

Atekwana

2009

Surv Geophys

147

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“…An integration of geophysical methods combined with chemical analyses of groundwater samples is helpful in studying the hydrogeological conditions and saline contamination of aquifer zones (Urish 1983;Ibrahim and Hussein 1998;Frohlich et al 2008), and largely resolves the uncertainty (Choudhury and Saha 2004). Similarly, in the present study, an attempt had been made to trace the saline water intrusion and subsurface pollution zones based on the topographic survey, water level measurement, geophysical methods, and monitoring of groundwater quality.…”

Section: Methodsmentioning

confidence: 82%

Integrated approach for demarcating subsurface pollution and saline water intrusion zones in SIPCOT area: a case study from Cuddalore in Southern India

Sankaran

Sonkamble

Krishnakumar

et al. 2011

Environ Monit Assess

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This paper deals with a systematic hydrogeological, geophysical, and hydrochemical investigations carried out in SIPCOT area in Southern India to demarcate groundwater pollution and saline intrusion through Uppanar River, which flows parallel to sea coast with high salinity (average TDS 28, 870 mg/l) due to back waters as well as discharge of industrial and domestic effluents. Hydrogeological and geophysical investigations comprising topographic survey, self-potential, multi-electrode resistivity imaging, and water quality monitoring were found the extent of saline water intrusion in the south and pockets of subsurface pollution in the north of the study area. Since the area is beset with highly permeable unconfined quaternary alluvium forming potential aquifer at shallow depth, long-term excessive pumping and influence of the River have led to lowering of the water table and degradation of water quality through increased salinity there by generating reversal of hydraulic gradient in the south. The improper management of industrial wastes and left over chemicals by closed industries has led surface and subsurface pollution in the north of the study area.

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“…The surface geophysical methods are noninvasive and constitute profitable solutions of replacement to obtain information on the underground water pollution [2]. The great contrast of International Journal of Geophysics resistivity between the saturated with salted water formation and that saturated with fresh water was used by a great number of researchers for the study of the saline water intrusion in the coastal sectors [11][12][13][14]. Van Dam and Meulankamp [11] estimated the salinity of subsoil water in the western part of The Netherlands by using the method of the resistivities.…”

Section: Introductionmentioning

confidence: 99%

Environmental Geophysical Study of the Groundwater Mineralization in a Plot of the Cotonou Littoral Zone (South Benin)

Yalo

Descloîtres

Alassane

et al. 2012

International Journal of Geophysics

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Geophysical investigations comprising electrical resistivity and electromagnetic conductivities methods were deployed in a 350 m2sector, strewn with 11 wells. Within the framework of an environmental study on a small scale in the south of Benin, the water conductivity of these wells was measured to determine in a direct way mineralization of the coastal water table in the littoral zone. This environmental study aimed to prospect by the geophysical methods the space extension of the water table mineralization obtained by direct measurements of water conductivity in the well and the depth of the fresh water/salted water interface in the coastal aquifer. Electromagnetic measurements of conductivities made it possible to chart a gradient of mineralization in the northwest direction. The logs of vertical electric soundings showed a deepening of the fresh water/salted water interface in the southern part and its rupture in the northern part. The electrical resistivities of the interface are sensitive to the degree of its mineralization. It has been observed that the geophysical methods in electrical and electromagnetic prospection are a great contribution to the environmental study of the water table mineralization in the littoral zone for a sustainable management of the water resource.

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Investigating changes of electrical characteristics of the saturated zone affected by hazardous organic waste

Cited by 34 publications

References 28 publications

Geophysical Signatures of Microbial Activity at Hydrocarbon Contaminated Sites: A Review

Geophysical Signatures of Microbial Activity at Hydrocarbon Contaminated Sites: A Review

Integrated approach for demarcating subsurface pollution and saline water intrusion zones in SIPCOT area: a case study from Cuddalore in Southern India

Environmental Geophysical Study of the Groundwater Mineralization in a Plot of the Cotonou Littoral Zone (South Benin)

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