Automated Geophysical Field Calculator Using Schlumberger Electrode System
Keywords:Apparent Resistivity (ρa), Geometric factor (k), Potential electrode spacing (l), Current electrode spacing (L), flash content, Homogeneous media, Lateral variations.
The aim of this paper is to present a fast and direct approach for solving the geometric factor (k) and the Apparent Resistivity (?a) for the Schlumberger electrode configurations in geo-electric field surveys, using the measured quantities of the current electrode and potential electrode spacing respectively. The program is a web-based development based on scripting. Swish script is the major driver alongside the hypertext markup language (html), developed and housed in flash-java containers. The main features are the potential electrode spacing (M,N), current electrode spacing (A,B), the instant resistance reading (V/I (?)) (is the reading from the measuring device, usually a resistivity meter), the Geometric factor (k) and the Apparent Resistivity ( ).The ability of the program to modify basic quantities like current electrode spacing, the potential electrode spacing and the V/I to suit individual field practice with respect to the lateral and vertical variations in the inhomogeneous media made it a unique program. On execution of the program, it was found that both the geometric factor (k) and the apparent resistivity ( ) values are automatically displayed once the respective field data were inputted and the execute button clicked accordingly. It was tested for values of L = 1.0, 1.47,…,100 and l = 0.5, …,500. Finally a standard field sheet was incorporated into the program to reduce the monotony of numbering.
M. H. Loke. Electrical Imaging Surveys for Environmental and Engineering Studies. A practical guide to 2- and 3-D surveys, 2000.
C. W. Montgomery. Environmental Geology (5th Edition.). McGraw Hill. New York, 2000.
O. M. Alile, S. I. Jegede, and M. O. Ehigiator. ‘Underground Water Exploration using Electrical Resistivity Method in Edo State’. Asian Journal of Earth Sciences, Vol 1. No. 1, pp. 38-42, 2008.
B. Sachin, and S. P. Sharma. Groundwater Potential Assessment using Resistivity Sounding method near Kalilkunda, West Bengal, 2008.
W. M. Telford, L. P. Geldart, and R. E. Sheriff. Applied Geophysics. Second Edition, Cambridge University Press, 1990.
P. Kearey, M. Brooks, and I. Hill, I. An Introduction to Geophysical Exploration, (3rd Edition). Blackwell Science Ltd., Oxford, 2002.
M. B. Dobrin, and C. H. Savit. Introduction to Geophysical Prospecting (4th Ed). McGraw Hill, New York, 1998.
A. A. R. Zohdy (1989, January). A new method for the automatic interpretation of Schlumberger and Wenner Sounding Curves. [Online]. Available from https://pubs.er.usgs.gov/publication/70015572, Geophysics, Vol. 54, No 2, pp. 245-253, [June, 2017].
W. E. Wightman, F. Jalinoos, P. Sirles, and K. Hanna, K. (2003). Application of Geophysical Methods to Highway Related Problems. Federal Highway Administration, Central Federal Lands Highway Division, Lakewood, CO, Publication No. FHWA-IF-04-021, September 2003
A. Zara (2014). Java Tutorial Point, Java Easy learning. [Online]. Available from
http://www.tutorialpoint.com [May, 2017].
S. Maiti, G. Gupta, V. C. Erram and R. K. Tiwari. ‘Inversion of Schlumberger resistivity sounding data from the critically dynamic Koyna region using the Hybrid Monte Carlo-based neural network approach’ Nonlinear Processes in Geophysics., Vol. 18, pp. 179-192, 2011.
E. A. Keller. Introduction to Environmental Geology, Pearson, 2016, pp. 25-28.
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