Monitoring hydraulic processes with automated time-lapse electrical resistivity tomography (ALERT)

Olivier Kuras, Jonathan D. Pritchard, Philip I. Meldrum, Jonathan E. Chambers, Paul B. Wilkinson, Richard D. Ogilvy, Gary P. Wealthall

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Hydraulic processes in porous media can be monitored in a minimally invasive fashion by time-lapse electrical resistivity tomography (ERT). The permanent installation of specifically designed ERT instrumentation, telemetry and information technology (IT) infrastructure enables automation of data collection, transfer, processing, management and interpretation. Such an approach gives rise to a dramatic increase in temporal resolution, thus providing new insight into rapidly occurring subsurface processes. In this paper, we discuss a practical implementation of automated time-lapse ERT. We present the results of a recent study in which we used controlled hydraulic experiments in two test cells at reduced field scale to explore the limiting conditions for process monitoring with cross-borehole ERT measurements. The first experiment used three adjacent boreholes to monitor rapidly rising and falling water levels. For the second experiment, we injected a saline tracer into a homogeneous flow field in freshwater-saturated sand; the dynamics of the plume were then monitored with 2D measurements across a 9-borehole fence and 3D measurements across a 3 × 3 grid of boreholes. We investigated different strategies for practical data acquisition and show that simple re-ordering of ERT measurement schemes can help harmonise data collection with the nature of the monitored process. The methodology of automated time-lapse ERT was found to perform well in different monitoring scenarios (2D/3D plus time) at time scales associated with realistic subsurface processes. The limiting factor is the finite amount of time needed for the acquisition of sufficiently comprehensive datasets. We found that, given the complexity of our monitoring scenarios, typical frame rates of at least 1.5-3 images per hour were possible without compromising image quality.

LanguageEnglish
Pages868-885
Number of pages18
JournalComptes Rendus - Geoscience
Volume341
Issue number10-11
DOIs
Publication statusPublished - 31 Oct 2009

Fingerprint

tomography
electrical resistivity
hydraulics
monitoring
borehole
experiment
information technology
telemetry
automation
data acquisition
limiting factor
flow field
instrumentation
porous medium
water level
plume
tracer
infrastructure
timescale
sand

Keywords

  • automated remote geophysical monitoring
  • cross-borehole tomography
  • hydraulic processes
  • time-lapse electrical resistivity tomography
  • tracer test

Cite this

Kuras, O., Pritchard, J. D., Meldrum, P. I., Chambers, J. E., Wilkinson, P. B., Ogilvy, R. D., & Wealthall, G. P. (2009). Monitoring hydraulic processes with automated time-lapse electrical resistivity tomography (ALERT). Comptes Rendus - Geoscience, 341(10-11), 868-885. https://doi.org/10.1016/j.crte.2009.07.010
Kuras, Olivier ; Pritchard, Jonathan D. ; Meldrum, Philip I. ; Chambers, Jonathan E. ; Wilkinson, Paul B. ; Ogilvy, Richard D. ; Wealthall, Gary P. / Monitoring hydraulic processes with automated time-lapse electrical resistivity tomography (ALERT). In: Comptes Rendus - Geoscience. 2009 ; Vol. 341, No. 10-11. pp. 868-885.
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Kuras, O, Pritchard, JD, Meldrum, PI, Chambers, JE, Wilkinson, PB, Ogilvy, RD & Wealthall, GP 2009, 'Monitoring hydraulic processes with automated time-lapse electrical resistivity tomography (ALERT)' Comptes Rendus - Geoscience, vol. 341, no. 10-11, pp. 868-885. https://doi.org/10.1016/j.crte.2009.07.010

Monitoring hydraulic processes with automated time-lapse electrical resistivity tomography (ALERT). / Kuras, Olivier; Pritchard, Jonathan D.; Meldrum, Philip I.; Chambers, Jonathan E.; Wilkinson, Paul B.; Ogilvy, Richard D.; Wealthall, Gary P.

In: Comptes Rendus - Geoscience, Vol. 341, No. 10-11, 31.10.2009, p. 868-885.

Research output: Contribution to journalArticle

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T1 - Monitoring hydraulic processes with automated time-lapse electrical resistivity tomography (ALERT)

AU - Kuras, Olivier

AU - Pritchard, Jonathan D.

AU - Meldrum, Philip I.

AU - Chambers, Jonathan E.

AU - Wilkinson, Paul B.

AU - Ogilvy, Richard D.

AU - Wealthall, Gary P.

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KW - hydraulic processes

KW - time-lapse electrical resistivity tomography

KW - tracer test

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