4-D ground penetrating radar monitoring of a hydrocarbon leakage site in Fortaleza (Brazil) during its remediation process: a case history

Castro, David Lopes de; Branco, Raimundo Mariano Gomes Castelo

doi:10.1016/j.jappgeo.2003.08.021

Cited by 50 publications

(14 citation statements)

References 10 publications

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“…The replacement of pore water and air in the contaminated zone by LNAPL components will result in changes in the dc or static conductivity and relative permittivity. This would explain why early investigations of LNAPL contamination clearly show decreased electrical conductivity (Mazác et al 1990;DeRyck et al 1993;Lien and Enfield 1998) and enhanced GPR reflections (e.g., Daniels et al 1995;Campbell et al 1996;Lopes de Castro and Branco 2003) based on the insulating properties of LNAPL. Figure 3 shows the classic resistive response of fresh LNAPL spillage in a study conducted by DeRyck et al (1993).…”

Section: Short-term Geophysical Properties Of Sites Contaminated By Lmentioning

confidence: 95%

“…Sauck (2000) provides an overview of the distribution of LNAPLs in the subsurface ( Fig. 1; Sauck 2000) which has been summarized in Table form by Lopes de Castro and Branco (2003). The vapor phase consists of the volatile fractions of the hydrocarbon and is typically found in the upper parts of the vadose zone above the residual and free phase hydrocarbon zones.…”

Section: Factors Governing the Detection Of Subsurface Lnapl Contaminmentioning

confidence: 99%

“…Incidentally, DeRyck et al (1993) also reported similar GPR reflection characteristics in their kerosene injection experiment. Figure 5 shows an example of how the distribution of different phases of the LNAPL at a contaminated site results in varied GPR responses (Lopes de Castro and Branco 2003). This investigation was conducted over a gasoline spill site in Foraleza, Brazil, where gasoline leakage was first reported from an underground storage tank in 1998.…”

Section: Short-term Geophysical Properties Of Sites Contaminated By Lmentioning

confidence: 99%

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

Atekwana

2009

Surv Geophys

138

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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: Short-term Geophysical Properties Of Sites Contaminated By Lmentioning

confidence: 95%

Section: Factors Governing the Detection Of Subsurface Lnapl Contaminmentioning

confidence: 99%

Section: Short-term Geophysical Properties Of Sites Contaminated By Lmentioning

confidence: 99%

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

Atekwana

2009

Surv Geophys

138

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“…Regions of gas accumulation can affect surface GPR in a similar manner. Previous GPR studies reveal regions of ‘EM blanking’ (scattering of EM energy) attributed to the displacement of water by hydrocarbon gas vapors [ Daniels et al , 1995; Lopes de Castro and Branco , 2003]. The aim of our study was to investigate the spatial distribution, gas content and volume of free phase biogenic gas within peatlands.…”

Section: Introductionmentioning

confidence: 99%

Spatial variability in biogenic gas accumulations in peat soils is revealed by ground penetrating radar (GPR)

Comas

Slater

Reeve

2005

Geophysical Research Letters

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We performed surface and borehole ground penetrating radar (GPR) tests, together with moisture probe measurements and direct gas sampling to detect areas of biogenic gas accumulation in a northern peatland. The main findings are: (1) shadow zones (signal scattering) observed in surface GPR correlate with areas of elevated CH4 and CO2 concentration; (2) high velocities in zero offset profiles and lower water content inferred from moisture probes correlate with surface GPR shadow zones; (3) zero offset profiles depict depth variable gas accumulation from 0–10% by volume; (4) strong reflectors may represent confining layers restricting upward gas migration. Our results have implications for defining the spatial distribution, volume and movement of biogenic gas in peatlands at multiple scales.

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“…Thus, it is useful for investigations in geology, archeology and buried structures and pipelines (Al-Nuaimy et al, 2000;Beauprˆetre et al, 2012;Porsani et al, 2010;Tohge et al, 1998). In environmental pollution investigations, GPR can survey the NAPL leakage distribution (Cassidy, 2007;Greenhouse et al, 1993;Lopes de Castro and Branco, 2003). Annan (2002) provides a comprehensive review of the development history and applications of GPR.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Chen

Tong

et al. 2015

Journal of Applied Geophysics

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4-D ground penetrating radar monitoring of a hydrocarbon leakage site in Fortaleza (Brazil) during its remediation process: a case history

Cited by 50 publications

References 10 publications

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

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

Spatial variability in biogenic gas accumulations in peat soils is revealed by ground penetrating radar (GPR)

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

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