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Increasing the effectiveness of electrical resistivity tomography using γ 11n configurations
Author(s) -
Szalai S.,
Lemperger I.,
Metwaly M.,
Kis Á.,
Wesztergom V.,
Szokoli K.,
Novák A.
Publication year - 2015
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/1365-2478.12215
Subject(s) - electrical resistivity and conductivity , electrical resistivity tomography , discontinuity (linguistics) , economic geology , electrode , tomography , sequence (biology) , classification of discontinuities , geology , resolution (logic) , geometry , materials science , optics , computer science , physics , mathematics , mathematical analysis , hydrogeology , chemistry , geotechnical engineering , biochemistry , quantum mechanics , artificial intelligence , telmatology
ABSTRACT A new array type, i.e., the γ 11n arrays, is introduced in this paper, in which the sequence of the current (C) and potential (P) electrodes is CPCP, and the distance between the last two electrodes is n times the distance between the first two ones and that of the second one and the third one. These arrays are called quasinull arrays because they are—according to their array and behaviour—between the traditional and null arrays. It is shown by numerical modelling that, in detecting small‐effect inhomogeneity, these configurations may be more effective than the traditional ones, including the optimized Stummer configuration. Certain γ 11n configurations—especially the γ 112 , γ 113, and γ 114 —produced better results both in horizontal and vertical resolution investigations. Based on the numerical studies, the γ 11n configurations seem to be very promising in problems where the anomalies are similar to the numerically investigated ones, i.e., they can detect and characterize, e.g., tunnels, caves, cables, tubes, abandoned riverbeds, or discontinuity, in a clay layer with greater efficacy than those of the traditional configurations. γ 11n measurements need less data than traditional configurations; therefore, the time demand of electrical resistivity tomography measurements can be shortened by their use.