Application of 2-D geoelectrical resistivity tomography for subsurface cavity detection in the eastern part of Saudi Arabia

Metwaly, Mohamed; Alfouzan, Fouzan

doi:10.1016/j.gsf.2012.12.005

Cited by 88 publications

(39 citation statements)

References 17 publications

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“…This option resulted in sharp edges; also, this fragment was attributed the shape of a regular geometric block. We observe similar effects in interpreted sections showing the presence of cavities in the eastern part of Saudi Arabia as discussed by Metwaly & AlFouzan (2013).…”

Section: Discussionsupporting

confidence: 84%

2D Electrical Resistivity Tomography interpretation ambiguity - example of field studies supported with analogue and numerical modelling

Bania¹,

Ćwiklik²

2013

geol

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Single Electrical Resistivity Tomography (ERT) survey was carried out in the Manor and Park Complex in Nowa Huta (Krakow Branice, Poland). It was applied at a small distance and parallel to the longer wall of a monumental building containing an empty 3 m deep basement. Analogue modelling was performed in order to recreate the field study at the proper scale. The laboratory set-up consisted of a water tank where electrodes were mounted to the particular plate, which rested on water surface. The basement model was made out of a non-conducting material. The default and robust inversions were tested and these variants were also considered with the use of numerical modelling. Laboratory experiments have confirmed that zones visible in the interpreted field section are caused by the influence of the building cellar located next to the survey line. Zones of this kind are additionally disturbed by the local geological structure. The experiment has pointed out, among others, that as the distance between the survey line and the underground body increases, the inversion results are still burdened by an object influence. Thus, similar situations can be verified with the use of analogue modelling presented in this paper or 3D numerical one.

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Section: Discussionsupporting

confidence: 84%

2D Electrical Resistivity Tomography interpretation ambiguity - example of field studies supported with analogue and numerical modelling

Bania¹,

Ćwiklik²

2013

geol

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“…Advances in instrumentation and computer algorithm has led to the development of 2D, 3D electrical imaging technique using multi-electrode resistivity systems which is more cost-effective and capable of providing a better representation of the subsurface (Loke, 2004;Kumar, 2012;Metwaly and AlFouzan, 2013). In the 2-D electrical imaging method, resistivity changes in both vertical and horizontal direction along the survey line are accounted for.…”

Section: Sub Introductionmentioning

confidence: 99%

Soil Structure Evaluation Across Geologic Transition Zones Using 2D Electrical Resistivity Imaging Technique

Anukwu

Adebara

Abodunrin

et al. 2017

J. Geoscience Eng. Environ. Technol.

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This study utilizes the electrical resistivity values obtained using 2-D Electrical resistivity imaging (ERI) technique to evaluate the subsurface lithology across different geological units. The primary objective was to determine the effect of subsurface lithology on the integrity of a road pavement, which had developed cracks and potholes at various locations. The dipole-dipole configuration was utilized and a total of nine traverses were established in the study area, whose geology cuts across both the basement and sedimentary complexes. The inverted resistivity section obtained showed significant variation in resistivity along established traverses and also across the different rock units, with the resistivity value ranging from about 4 ohm-m to greater than 7000 ohm-m. The lithology as interpreted from the resistivity section revealed the presence topsoil, clay, sandy clay, sand, sand stones/basement rocks, with varying vertical and horizontal arrangements to a depth of 40m. Results suggest that the geologic sequence and structure might have contributed to the observed pavement failure. The capability of the 2D ERI as an imaging tool is observed, especially across the transition zones as depicted in this study. The study further stressed the ability of this technique if properly designed and implemented, to be capable of providing a wealth of information that could complement other traditional geotechnical and geologic techniques.

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“…Geophysical techniques allow large areas to be covered in a short period of time and represent an efficient way of detecting subsurface heterogeneities including voids (Farooq et al, 2012). This provides much more effective and economic way to reduce the overall amount of drillings and to improve locating test drilling for verification (Metwaly & AlFouzan, 2013). The electrical resistivity method is based on assumption that various entities like minerals, solid bedrock, sediments, air and water filled structures have detectable electrical resistivity contrast relative to the host medium (Panek et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Integrated Use of Geological, Geophysical, Radiocarbon and Stable Isotopes Data for Tracing the Conduit Flow Paths in a Small Karstic Aquifer: Poocher Swamp Freshwater Lens, South Australia

Somaratne¹,

Mann²

2016

ENRR

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An integrated approach combining lithological logs, downhole geophysics, electromagnetic survey and the distribution of radiocarbon ( 14 C) and the stable isotopes of water molecules ( 18 O) were used to identify the conduit flow paths of a small freshwater lens. Lost circulation zones, where drilling fluid flows into geological formation instead returning up the annulus recorded during water well drilling, were considered as the major fracture zones. The presence of high porosity zones within boreholes were identified using caliper, gamma and neutron logs. These methods were used to identify the depth intervals at which cavities and the existence of conduit porosity within the boreholes. Transient electromagnetic (TEM) method was used to investigate resistivity anomalies in the profiles along nine pre-determined lines across the freshwater lens. Resistivity anomalies were related to borehole information and other surface features such as sinkholes. Low resistivity zones of the TEM tomography sections had excellent correlation to fracture zones identified during well drilling, and downhole geophysical logs. Similarly, high resistivity zones in the profiles correlate well with the zones of O signatures of the groundwater confirm the presence of conduits and potential pathways of preferential flows. This investigation illustrates the effectiveness using an integrated approach to trace the conduit flow paths in karst aquifers. The information gained from the study is currently being used for the management of the freshwater lens.

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Application of 2-D geoelectrical resistivity tomography for subsurface cavity detection in the eastern part of Saudi Arabia

Cited by 88 publications

References 17 publications

2D Electrical Resistivity Tomography interpretation ambiguity - example of field studies supported with analogue and numerical modelling

2D Electrical Resistivity Tomography interpretation ambiguity - example of field studies supported with analogue and numerical modelling

Soil Structure Evaluation Across Geologic Transition Zones Using 2D Electrical Resistivity Imaging Technique

Integrated Use of Geological, Geophysical, Radiocarbon and Stable Isotopes Data for Tracing the Conduit Flow Paths in a Small Karstic Aquifer: Poocher Swamp Freshwater Lens, South Australia

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