Capability of cross-hole electrical configurations for monitoring rapid plume migration experiments

Bellmunt, F.; Marcuello, Álex; Ledo, Juanjo; Queralt, Pilar

doi:10.1016/j.jappgeo.2015.11.010

Cited by 25 publications

(11 citation statements)

References 30 publications

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“…Second, it is essential to ensure that the depth and spacing of boreholes meet the requirements. The reason for this is that the spacing of the holes should not exceed approximately 0.75 times the hole array length, to guarantee achieving a rational image resolution [21,26]. Finally, boulders that have been detected should be disposed of in a timely manner.…”

Section: Discussionmentioning

confidence: 99%

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Synthetic Study of Boulder Detection Using Multi-Configuration Combination of Cross-Hole ERT and Its Field Application in Xiamen Metro, China

et al. 2021

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With the fast development of urban rail transportation, shield construction has been widely used in tunnel construction in China. It is very important to detect the random distribution of boulders, which may cause geological problems. Cross-hole electrical resistivity tomography (ERT) has the advantage of precise detection, but it has not been systematically studied in solitary rock detection. Therefore, we set up several numerical models and proposed weighted inversion, to improve the capacity for detecting boulders. Subsequently, the method was applied to the Xiamen Metro Line 1, where it was highly likely to encounter boulders. All the test boreholes revealed the presence of boulders, and their location and size were consistent with the geophysics results. This study demonstrated the suitability of weighted inversion based on a multi-configuration combination of cross-hole ERT for the detection of boulders. This case study provides new engineering perspectives on how to detect boulders.

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Section: Discussionmentioning

confidence: 99%

“…Liu et al [19] used an optimized refraction tomography method to accurately determine a tunnel's geology. Nie et al [20,21] used the ERT method to detect underground abnormal bodies in physical models and practical engineering. In previous studies, cross-hole ERT was used for many aspects.…”

Section: Introductionmentioning

confidence: 99%

Synthetic Study of Boulder Detection Using Multi-Configuration Combination of Cross-Hole ERT and Its Field Application in Xiamen Metro, China

et al. 2021

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“…Wenner, following Bellmunt et al (2016) (Figure 4). We used a ten-channel Syscal Pro resistivity meter and an optimized survey design which allowed to record normal and reciprocal measurements: a total of 5842 data points per cross-hole panel in 30 minutes.…”

Section: Cross Hole Electrical Resistivity Tomography (Chert)mentioning

confidence: 99%

Combining fiber optic DTS, cross-hole ERT and time-lapse induction logging to characterize and monitor a coastal aquifer

Folch

Val

Luquot

et al. 2020

Journal of Hydrology

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…We conjecture that cross-hole ERT (CHERT) can enhance the imaging of natural saltwater-freshwater dynamics, given that its superior resolution compared with surfacebased deployments have been amply demonstrated in other related application areas (Bellmunt et al, 2016;Bergmann et al, 2012;Kiessling et al, 2010;Leontarakis and Apostolopoulos, 2012;Schmidt-Hattenberger et al, 2013). Although CHERT has drawbacks (high contact resistance in the unsaturated zone, loss of the fully non-invasive nature of surface ERT and sensitivity being mainly constrained to the region between the boreholes), the benefits of this type of tomography may be larger because the resolution of the inversion images obtained will be high at the depths where changes are expected to occur.…”

Section: Introductionmentioning

confidence: 99%

Time-lapse cross-hole electrical resistivity tomography (CHERT) for monitoring seawater intrusion dynamics in a Mediterranean aquifer

Palacios

Ledo

Linde

et al. 2020

Hydrol. Earth Syst. Sci.

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Abstract. Surface electrical resistivity tomography (ERT) is a widely used tool to study seawater intrusion (SWI). It is noninvasive and offers a high spatial coverage at a low cost, but its imaging capabilities are strongly affected by decreasing resolution with depth. We conjecture that the use of CHERT (cross-hole ERT) can partly overcome these resolution limitations since the electrodes are placed at depth, which implies that the model resolution does not decrease at the depths of interest. The objective of this study is to test the CHERT for imaging the SWI and monitoring its dynamics at the Argentona site, a well-instrumented field site of a coastal alluvial aquifer located 40 km NE of Barcelona. To do so, we installed permanent electrodes around boreholes attached to the PVC pipes to perform time-lapse monitoring of the SWI on a transect perpendicular to the coastline. After 2 years of monitoring, we observe variability of SWI at different timescales: (1) natural seasonal variations and aquifer salinization that we attribute to long-term drought and (2) short-term fluctuations due to sea storms or flooding in the nearby stream during heavy rain events. The spatial imaging of bulk electrical conductivity allows us to explain non-monotonic salinity profiles in open boreholes (step-wise profiles really reflect the presence of freshwater at depth). By comparing CHERT results with traditional in situ measurements such as electrical conductivity of water samples and bulk electrical conductivity from induction logs, we conclude that CHERT is a reliable and cost-effective imaging tool for monitoring SWI dynamics.

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Capability of cross-hole electrical configurations for monitoring rapid plume migration experiments

Cited by 25 publications

References 30 publications

Synthetic Study of Boulder Detection Using Multi-Configuration Combination of Cross-Hole ERT and Its Field Application in Xiamen Metro, China

Synthetic Study of Boulder Detection Using Multi-Configuration Combination of Cross-Hole ERT and Its Field Application in Xiamen Metro, China

Combining fiber optic DTS, cross-hole ERT and time-lapse induction logging to characterize and monitor a coastal aquifer

Time-lapse cross-hole electrical resistivity tomography (CHERT) for monitoring seawater intrusion dynamics in a Mediterranean aquifer

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