Bedrock detection beneath river terrace deposits using three-dimensional electrical resistivity tomography

Chambers, Jonathan; Wilkinson, Paul; Wardrop, D. R.; Hameed, A. Shahul; Hill, Ian A.; Jeffrey, C. A.; Loke, M.H.; Meldrum, Philip; Kuras, O.; Cave, Mark; Gunn, David

doi:10.1016/j.geomorph.2012.03.034

Cited by 80 publications

(38 citation statements)

References 38 publications

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“…We believe that this approach is adequate; however, for future investigations of this kind, we would complement the GPR data with Electrical Resistivity Tomography (ERT) profiling to further validate our interpretation. ERT would be well suited for defining a soil/rock interface (e.g., Chambers, Wilkinson, Wardrop, Hameed, Hill et al, 2012) and would not be affected by the rough ground surface.…”

Section: Resultsmentioning

confidence: 99%

Using ground penetrating radar to understand the failure of the Koh Ker Reservoir, Northern Cambodia

et al. 2019

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Ground penetrating radar, probing, and excavation were used to create a contour map of the topography of a buried laterite pavement forming the spillway of a large abandoned reservoir at the Angkorian‐period city of Koh Ker in Cambodia. Calculations of the flow velocity of water through the spillway, based on the topography of the laterite surface, demonstrate that this outlet was even less adequate for passing the flow of water from the Stung Rongea catchment than had been estimated previously by Lustig, Klassen, Evans, French, & Moffat (2018). We argue that this design flaw contributed substantially to the failure of the reservoir’s dike, possibly during the first rainy season after construction, which may have contributed to Koh Ker’s remarkably short‐lived tenure as the political center of the Khmer Empire.

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Section: Resultsmentioning

confidence: 99%

Using ground penetrating radar to understand the failure of the Koh Ker Reservoir, Northern Cambodia

et al. 2019

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“…However, in areas with very complex geology, it has been found that the models obtained from 2-D surveys can suffer from artefacts due to offline structures (Dahlin & Loke 1998;Bentley & Gharibi 2004). For such problems, 3-D surveys using a rectangular grid of electrodes provide the best solution (Dahlin et al 2002;Gharibi & Bentley 2005;Chambers et al 2006Chambers et al , 2012. Frequently, due to physical limitations in many commercial multielectrode resistivity meters systems, the number of electrode positions along one direction (the 'x' direction) is much larger than in the perpendicular (the 'y') direction.…”

Section: Introductionmentioning

confidence: 99%

Computation of optimized arrays for 3-D electrical imaging surveys

Loke¹,

Wilkinson

Uhlemann

et al. 2014

Geophysical Journal International

141

120

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S U M M A R Y3-D electrical resistivity surveys and inversion models are required to accurately resolve structures in areas with very complex geology where 2-D models might suffer from artefacts. Many 3-D surveys use a grid where the number of electrodes along one direction (x) is much greater than in the perpendicular direction (y). Frequently, due to limitations in the number of independent electrodes in the multi-electrode system, the surveys use a roll-along system with a small number of parallel survey lines aligned along the x-direction. The 'Compare R' array optimization method previously used for 2-D surveys is adapted for such 3-D surveys. Offset versions of the inline arrays used in 2-D surveys are included in the number of possible arrays (the comprehensive data set) to improve the sensitivity to structures in between the lines. The array geometric factor and its relative error are used to filter out potentially unstable arrays in the construction of the comprehensive data set. Comparisons of the conventional (consisting of dipole-dipole and Wenner-Schlumberger arrays) and optimized arrays are made using a synthetic model and experimental measurements in a tank. The tests show that structures located between the lines are better resolved with the optimized arrays. The optimized arrays also have significantly better depth resolution compared to the conventional arrays.

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“…In particular this 3D approach has been used into mapping the structure of different waste disposal sites (Dahlin et al, 2002;Chambers et al, 2006Chambers et al, , 2012Soupios et al, 2007b).…”

Section: Introductionmentioning

confidence: 99%

3D electrical resistivity tomography technique for the investigation of a construction and demolition waste landfill site

et al. 2015

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We present the practical application of a 3D electrical resistivity tomography (ERT) geophysical survey conducted in order to calculate the geometrical features and general structure of a construction and demolition waste layer in an old unregulated landfill prior to redevelopment. As traditional geological/geotechnical investigations comprised of cone penetration tests (CPT) failed to provide reliable results, primarily due to the nature of the underlying waste, a geophysical investigation was commissioned and found to be very effective in providing useful and accurate information to the project's environmental and engineering team. The ERT survey data were collected in parallel equidistant lines and were subsequently merged and inverted as a single 3D dataset. The processed data depicted clearly the interface between the resistive construction waste and the conductive undisturbed host clay layer ranging at depths between 3 and 11 m. As a result of this successful geophysical investigation the total volume of the solid waste materials was calculated to be about 32500 m 3 . Following the complete removal of the waste it became evident that the ERT geophysical survey results were particularly accurate. As a result, the reclamation constructor was able to carefully plan the required resources for excavating, moving and disposing of the waste. Interpreted ERT data not only defined the thickness of the debris layer and the total volume with a deviation of less than 10%, but also revealed the inner structure of the solid waste layer.

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Bedrock detection beneath river terrace deposits using three-dimensional electrical resistivity tomography

Cited by 80 publications

References 38 publications

Using ground penetrating radar to understand the failure of the Koh Ker Reservoir, Northern Cambodia

Using ground penetrating radar to understand the failure of the Koh Ker Reservoir, Northern Cambodia

Computation of optimized arrays for 3-D electrical imaging surveys

3D electrical resistivity tomography technique for the investigation of a construction and demolition waste landfill site

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