Reliability of dipole-dipole electrical resistivity tomography for defining depth to bedrock in covered karst terranes

Zhou, Wanfang; Beck, Barry F.; Stephenson, J. Brad

doi:10.1007/s002540050491

Cited by 85 publications

(50 citation statements)

References 4 publications

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“…The question of which is the most effective array is a matter of some debate in the literature (see for example the discussions in studies by Zhou et al, 2000;Zhou and Dahlin, 2003;Dahlin and Zhou, 2004;Drahor 2006;Pá nek et al, 2010). Some authors consider that the Wenner array is most sensitive to changes in the vertical resistivity of the subsoil (Griffiths and Turnbull, 1985;Griffiths and Barker, 1993), the average reliable depth for investigation being around half that of the spacing (Edwards, 1977).…”

Section: Methodsmentioning

confidence: 99%

Electrical Tomography Applied to the Detection of Subsurface Cavities

Martines-López¹,

Rey²,

Dueñas³

et al. 2013

JCKS

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Abstract:We have analyzed the geoelectric response produced by three cavities cut into different geological substrata of granite, phyllite, and sandstone that had previously been characterized by direct methods. We also examined a mining void excavated in granite. In each case, we applied three different geoelectric arrays (Wenner-Schlumberger, Wenner and dipole-dipole) and several inter-electrode spacings. The survey results suggest that electrical resistivity tomography is a viable geophysical tool for the detection and monitoring of mining voids and other subsurface cavities. The results vary depending on a wide range of factors, such as the depth and diameter of the cavity, the multi-electrode array used, the inter-electrode spacing, the geological model, and the density of the data. The resolution capacity of the Wenner-Schlumberger array for the detection of these cavities was greater than that of the Wenner array and slightly better than the dipole-dipole. There is a direct relationship between inter-electrode spacing and diameter of the cavity. In general, we observed a loss of resolution as the distance between the electrodes increased. The most efficient detection was achieved when the inter-electrodes distance was less than or equal to the diameter of the cavity itself. In addition, cavity detection became increasingly less precise with its depth beneath the surface. Cavities with a radius of about 1.5 m were located by both the WennerSchlumberger method and the dipole-dipole at depths of more than 4.6 m, which means that prospecting can be carried out at depths 3 times the radius of the cavity.

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Section: Methodsmentioning

confidence: 99%

Electrical Tomography Applied to the Detection of Subsurface Cavities

Martines-López¹,

Rey²,

Dueñas³

et al. 2013

JCKS

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“…The advent of automated resistivity meters combined with the developments of advanced interpretation (inversion) algorithms Barker 1995, 1996) allow the rapid acquisition of accurate images of the subsurface resistivity and render ERT one of the most important near surface geophysical techniques. Simple modification of instrumentation allow the application of ERT into addressing environmental and engineering problems related to marine environments as several recent applications suggest (Zhou et al 2000;Drahor et al 2006;Yang et al 2002;De Souza and Sampaio 2001).…”

Section: Introductionmentioning

confidence: 99%

Electrical resistivity tomography mapping of beachrocks: application to the island of Thassos (N. Greece)

2009

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Electrical resistivity tomography (ERT) technique is widely used in mapping subsurface electrical properties. In this study, ERT was used to map a beachrock outcrop, extended both inland, under beach sediments, and seawards, on and under seafloor sediments. Mapping of beachrock is considered important because it can help evaluate the lateral and vertical extend of the formation. Fast and reliable mapping of beachrocks may contribute in several applications like engineering and construction, coastal management, recreational reformation as well as scientific approaches like coastal evolution research, and palaeo-environmental studies. The outcome of the survey was the mapping of the formation with centimeter precision, especially towards the sea. Special processing was applied to the data in order to constrain the inversion procedure to include the known sea water layer.

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“…Moreover, other research was completed by Yassin, R.R. (2002) and Zhou, et al (2000). Finally, earlier research was completed by Yahia et al (1992).…”

Section: Locatiomentioning

confidence: 96%

Determine Sinkholes and Overburden Thicknesses in Selected Covered Carbonate Karst Terrains (Kinta Valley), Perak, Malaysia by Combining Wenner E.R. Tomography, Geological and Satellite Images Techniques

Yassin¹,

Muhammad²,

Taib³

2014

JGG

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This paper discusses the application of Wenner's Electrical Resistivity Tomography, geological, and satellite-imaging techniques to the process of determining sinkholes and overburdened thickness in covered carbonate karst terrains. The study area is located in (Kinta Valley), at a place called Kampung Kunsila estate, situated northwest of Kampar City and south of Ipoh, the capital of Perak, Peninsular Malaysia.Several active sinkholes were discovered and identified during site field inspections. The sinkholes ranged from narrow-to-medium and medium-to-wide sizes, some with exposed throats. On average, the diameter of the sinkholes in the study area ranged from 1 m to more than ~ 30 m, some having approximately the corresponding range in depth. Surface water induces erosion along the frame of the sinkhole, which causes enlargement to several meters long. Some of the sinkholes were selected for the application of high-resolution geophysical technique in order to realize the objectives of the study.Wenner's Electrical Resistivity Tomography (ERT) was used along many profiles to capture the image of the subsurface across and in proximity to various types of sinkholes as a primary stage. This method will allow the recognition of their shapes and estimation of their depths. In addition it will assist to know the origin of these sinkholes.The resistivity data from the multi-electrode measurements were collected at several profiles were plotted in graphs/maps. The resistivity maps showed images of many active karstic cavities and sinkholes having different shapes and origins. Some of these were identified as karstic features (sinkholes and cavities) as well water, clay or air infill. Additionally, the transmission of the material from the top (soil surface) down to the bedrocks via the solution showed enlarged joints, drainage systems or pipes, which is expected.The interpretation of the resistivity data was used to generate a geological model of the specified area. The geological model derived from the interpretation of the geophysical data consisted of a basal limestone unit, which was widely karstified and constituted the bedrock of the study area. The overburdened layers consist of sand, containing lenses of clay and covered by soil or sandy clay and friable sand. There are also rock fragments scattered throughout. This karstified limestone bedrock is intervened with sinkholes and cavities, in-filled with clay or sandy clay and sand. This is invariably interpreted as a karstic process.A certain variety of sinkholes with differing origins was identified in the study area via the information from the geological and geophysical survey data records. The first type of identified sinkholes was a few meters in diameter and depth and was referred to as cover-layers or material subsidence. The second type was wider than the first type in terms of diameter and depth, referred to as cover-collapse sinkholes; and the third kind of sinkhole is a slump depression produced on the ground surface. Finally, the fourth type i...

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Reliability of dipole-dipole electrical resistivity tomography for defining depth to bedrock in covered karst terranes

Cited by 85 publications

References 4 publications

Electrical Tomography Applied to the Detection of Subsurface Cavities

Electrical Tomography Applied to the Detection of Subsurface Cavities

Electrical resistivity tomography mapping of beachrocks: application to the island of Thassos (N. Greece)

Determine Sinkholes and Overburden Thicknesses in Selected Covered Carbonate Karst Terrains (Kinta Valley), Perak, Malaysia by Combining Wenner E.R. Tomography, Geological and Satellite Images Techniques

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