Abstract
The possibility of using a set of unequal electrodes, within limits, in a Wenner arrangement for the measurement of apparent resistivity at small depths is explored in this paper. A procedure in which only a simple preliminary calibration is necessary to obtain the best measurements of the apparent resistivity is proposed. On the basis of some case studies, a comparison with the usual procedures to obtain the apparent resistivity from resistance measurements is carried out. The results showed that when an unequal set of electrodes was used, the procedure proposed here was the only one that guaranteed the best apparent resistivity values for any value of electrode separation in the Wenner arrangement, especially for those associated with small depths.
Highlights
One of the most frequently used methods to determine the electrical resistivity of the ground versus the depth is vertical electrical sounding (VES) [1]
In a recent paper [10], the authors showed that if the bare rods described above are used as electrodes, the two previous expressions of F(a) for the calculation of the apparent resistivity do not give the correct values of this magnitude for electrode separations of a < 10 L
A non-standard set of electrodes are used as Wenner probes to measure
Summary
One of the most frequently used methods to determine the electrical resistivity of the ground versus the depth is vertical electrical sounding (VES) [1]. In a recent paper [10], the authors showed that if the bare rods described above are used as electrodes, the two previous expressions of F(a) for the calculation of the apparent resistivity do not give the correct values of this magnitude for electrode separations of a < 10 L This issue is very significant because it involves depths that are important, either from the technical or scientific point of view. Is related to the theground calibration shallow by usingtoelectrodes of varyinginshape and size that areThis introduced into at a proposed in this work.it is necessary to make a correction in the measurements This is related to the not negligible depth, In summary, in the present paper it is shown that it is possible to use electrodes of varied shapes calibration proposed in this work. Forapplying this purpose, the paper isused organized as follows: Afteristhe introduction the problem section, by the commonly expressions for F(a), compared withtothat obtained in from the the theoretical is the sketched
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