Model Study of the Resolution of Resistivity Tomography with Different Electrode Arrays

Danielsen, Berit Ensted; Dahlin, Torleif; Danielsen, Jens

doi:10.3997/2214-4609-pdb.13.p082

Cited by 2 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1), namely the bipole-bipole and pole-tripole (Goes and Meekes, 2004) configurations, and a modification of the conventional pole-dipole array. The above electrode arrays have been proposed and used in several studies that involve cross-hole ERT configurations (Sasaki, 1992;Zhou and Greenhalgh, 2000;Goes and Meekes, 2004;Danielsen et al, 2005;Apostolopoulos, 2012, 2013). Dedicated MATLAB-based software was developed to generate complete measurement protocols based on the examined electrode arrays, compatible with any cross-hole geometry and electrode positions, producing files ready to be employed by the resistivity meter used in this work (Syscal-Pro, Iris Instruments).…”

Section: Electrode Arraysmentioning

confidence: 99%

Application of crosshole electrical resistivity tomography measurements under the influence of horizontally slotted plastic cased boreholes

Almpanis

Tsourlos

Vargemezis

et al. 2021

Near Surface Geophysics

View full text Add to dashboard Cite

In this work, we study the performance of cross-hole electrical resistivity tomography measurements by employing different electrode array configurations in plastic polyvinyl chloride (PVC) cased and horizontally slotted observation boreholes by inserting a multi-electrode cable directly into the borehole. Preliminary cross-hole electrical resistivity tomography measurements in PVC cased boreholes related to an underground tunnel construction showed poor data quality. This was attributed to the borehole-fluid effect caused by the PVC casings. An experimental study was conducted to support this hypothesis by setting up various simulations in a water tank, using different PVC casings with various slot densities, and different electrode array configurations. We conclude that the applicability of various measurement setups depends mainly on the acquisition protocol and, to a lesser extent, on the slot density of the PVC casing. Among the different array configurations considered, the pole-dipole array with the potential measuring electrodes being placed in a separate borehole to the current electrodes provide the most robust and reliable results, even for low slot density PVC casings. Besides, denser borehole slot configurations result in better data quality, though to a different extent for the examined protocols. A minimum slot density criterion of at least six slots/electrode spacing is proposed, regardless of the electrode array. The experimental findings are finally evaluated against real field measurements associated with the construction of an underground tunnel of the new Thessaloniki Metro, verifying the pole-dipole array's superior behaviour for this type of measurement configuration. Finally, for those cases where the aspect ratio (hole depth/hole separation) is limited, we propose a modified borehole-to-surface configuration with the current electrodes placed outside the boreholes. The overall results indicate that slotted PVC cased observation boreholes (e.g., conventional piezometers), typically constructed as part of many infrastructure monitoring projects, can be efficiently employed for electrical resistivity tomography mapping, generating a new perspective for geoelectrical prospecting. This measuring approach exhibits a significant advantage. The use of pre-existing boreholes reduces the overall survey costs,

show abstract

Section: Electrode Arraysmentioning

confidence: 99%

Application of crosshole electrical resistivity tomography measurements under the influence of horizontally slotted plastic cased boreholes

Almpanis

Tsourlos

Vargemezis

et al. 2021

Near Surface Geophysics

View full text Add to dashboard Cite

show abstract

“…15, ζην νπνίν παξέρεηαη ε θακπχιε ηνπ κέζνπ ρξφλνπ δηαδξνκήο ζε ζρέζε κε ηελ απφζηαζε, γηα φιεο ηηο αθηίλεο. Απφ ηελ θακπχιε απηή κπνξνχλ λα πξνζδηνξηζηνχλ ε θιίζε ηεο θαη ην ζεκείν ηνκήο ηεο κε ηνλ άμνλα ηνπ ρξφλνπ.…”

unclassified

Γεωφυσικές Διασκοπήσεις Εντός Γεωτρήσεων Και Σηράγγων

Leontarakis¹,

Λεονταράκης²

View full text Add to dashboard Cite

show abstract

Model Study of the Resolution of Resistivity Tomography with Different Electrode Arrays

Cited by 2 publications

References 0 publications

Application of crosshole electrical resistivity tomography measurements under the influence of horizontally slotted plastic cased boreholes

Application of crosshole electrical resistivity tomography measurements under the influence of horizontally slotted plastic cased boreholes

Γεωφυσικές Διασκοπήσεις Εντός Γεωτρήσεων Και Σηράγγων

Contact Info

Product

Resources

About