Effects of a conductive rail on parallel apparent resistivity measurements

Wilkinson, P.B.. 2006 Effects of a conductive rail on parallel apparent resistivity measurements. Nottingham, UK, British Geological Survey, 15pp. (IR/06/096) (Unpublished)

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Apparent resistivity measurements made in proximity to a rail track are likely to be affected by preferential current channelling through the conductive rails. This report quantifies these effects using a simplified semi-analytic model to represent the rail. The results show that the commonly used measurement configurations are all affected in a similar manner, with greater distortion of the data at larger depths of investigation. The degree of distortion also depends on the contact resistance between the rail and the ground. The effect is least, however, for the Dipole-Dipole configuration, which is therefore recommended for resistivity surveys undertaken parallel to conductive rails. It is also recommended that the rail-ground contact resistance be measured during repeat resistivity surveys to allow the effects of the rail to be evaluated.

Item Type: Publication - Report
Programmes: BGS Programmes > Physical Hazards
Funders/Sponsors: NERC
Additional Information. Not used in RCUK Gateway to Research.: This item has been internally reviewed but not externally peer-reviewed
Additional Keywords: Electrical tomography, Railways
NORA Subject Terms: Earth Sciences
Date made live: 05 Jun 2009 10:42 +0 (UTC)

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