Keywords
resistivity
electrical tomography
sounding arrays
numerical modeling
geoelectric section
Section
Abstract
Electrical tomography is used in the diagnostics of ground hydraulic structures (HS). Measurements are carried out using various arrays. This paper examines the resolution of the most commonly used arrays: Wenner, Schlumberger, and forward and reverse three-electrode. Numerical 2-D modeling of electrical tomography soundings with these arrays was conducted on the proposed geoelectric model of an earthen dam, using RES2DMOD version 3.01 and RES2DINV version 3.4 programs for solving forward and inverse tasks. Calculations showed that the best convergence of the inversion to the specified geoelectric model of the dam is achieved by forward and reward three-electrode array sounding. Experimental work conducted on two earthen dams confirmed the advantages of using electrical resistivity tomography with a combination of three-electrode arrays for studying the condition of the hydraulic structure. This array allows for obtaining a resistivity section at greater depths, and also for localizing anomalies with lower resistivity values, indicating waterlogged soils and areas of increased water seepage from the reservoir.
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