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RESEARCH ARTICLE

Response to soil compaction of the electrical resistivity tomography, induced polarisation, and electromagnetic induction methods: a case study in Belgium

Danial Mansourian https://orcid.org/0000-0003-1503-6199 A B * , Adriaan Vanderhasselt C , Wim Cornelis C and Thomas Hermans A
+ Author Affiliations
- Author Affiliations

A Department of Geology, Ghent University, Ghent, Belgium.

B Mewbourne College of Earth and Energy, School of Geosciences, University of Oklahoma, Norman, OK, USA.

C Department of Environment, Ghent University, Ghent, Belgium.

* Correspondence to: danial.mansourian-1@ou.edu

Handling Editor: Gavan McGrath

Soil Research 62, SR22260 https://doi.org/10.1071/SR22260
Submitted: 17 December 2022  Accepted: 21 November 2023  Published: 12 December 2023

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context

Soil compaction acts at different scales and is challenging to measure on field scales.

Aims

To evaluate soil compaction under a controlled traffic experiment, using three different geophysical methods.

Methods

Electrical Resistivity Tomography (ERT), Electromagnetic Induction (EMI), and Induced Polarisation (IP) were selected to map soil compaction. Two different ERT arrays and EMI geometries were selected with different spacings. The influences of configuration, electrode spacing, and the Depth of Investigation Index (DOI) were evaluated. Soil physical properties were measured in the Laboratory and in the field. Error models were developed to assess the accuracy of the ERT profiles and later correlated with EMI and soil physical results.

Key results

Penetration resistance measurements identified a compacted layer at 25 to 35 cm depth with a maximum value of 5 MPa under fixed tracks and bulk density of 1.52 Mg m−3, while lowest values were 1.4 MPa and 1.36 Mg m−3. The dipole–dipole (DD) 10 cm array was more accurate towards both soil properties and locating the zones of high resistivity. The IP method identified chargeability anomalies at the same depth as the resistivity anomalies, possibly indicating a similar origin. The EMI test was less successful in accurately determining the locations of the conductive areas.

Conclusions

A clear relationship between the absolute value of the resistivity/conductivity signals with the level of compaction was not found, yet patterns of lateral variations in resistivity were identified.

Implications

Further studies are needed to establish the concrete relationship between soil compaction and geophysical signals.

Keywords: controlled traffic, depth of investigation index, electrical resistivity tomography, electromagnetic induction, geophysical methods, induced polarisation, penetration resistance, soil compaction.

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