A DIRECT CURRENT (DC) RESISTIVITY SURVEY OF THE EASTERN PART OF AHMADU BELLO UNIVERSITY MAIN CAMPUS, SAMARU-ZARIA
A DIRECT CURRENT (DC) RESISTIVITY SURVEY OF THE EASTERN PART OF AHMADU BELLO UNIVERSITY MAIN CAMPUS, SAMARU-ZARIA
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Date
2003-08
Authors
NOUHOU, IBRAHIM
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Abstract
A direct current (D.C.) resistivity survey, employing the vertical electrical sounding
(VES) at 39 stations evenly distributed, was carried out at the Eastern part of Ahmadu Bello
University-Zaria, comprising Areas E, F, G, Faculty of Agriculture, A.B.U. Gymnasium, and
Area BZ. The survey was carried out in order to understand the basement topography,
tectonic history along the two river channels in the study area (River Samaru and River
DanFodio), as well as possible sites or zones for locating boreholes.
Results from the interpretation of the data collected suggest 3-4 geoelectric layers.
The first layer whose resistivity values vary between 44-135OQm is associated with
top soils (consisting of fresh and weathered laterite, clay and sandy clay, and Fadama loam);
which has a thickness ranging from 1 and 8m.
The derived geologic sections suggest that the second or third layer consists of either
fractured basement or weathered basement, which constitutes the main aquifer of interest in
the study area. The thickness of the weathered basement varies between 5 and 53m, with
resistivity values ranging between 66 and 25OQm.
The results of this work also show that the two rivers Samaru and DanFodio are
structurally controlled because they originated prior to fractures. These two rivers constitute a
great deal of the groundwater potentials of the study area.
The fresh basement constitutes the third or fourth layer with resistivity values ranging
between 1025 and 924 1am. It is shallowest at VES24 (East of Area F) with a depth of 7m
and deepest at VES05 (53m), inside the Forestry Research Institute.
Result from the radial depth sounding plots revealed 2-3 fault patterns along the two
water courses; suggesting that the latter may have originated prior to faulting or fracturing
rather than a mere erosion feature.
The most prominent targets for boreholes are all along the Samaru River with the
exception of VES24, all of Area E, F, and G, as well as Faculty of Agriculture compound,
East of NAERLS, and the A.B.U gymnasium.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL
AHMADU BELLO UNIVERSITY, IN PARTIAL FULFILLMENT OF
THE REQUIREMENTS FOR THE AWARD OF THE DEGREE OF
MASTER OF SCIENCE IN APPLIED GEOPHYSICS.
DEPARTMENT OF PHYSICS,
AHMADU BELLO UNIVERSITY,
ZARIA.
Keywords
DIRECT,, CURRENT,, RESISTIVITY,, SURVEY,, EASTERN PART,, AHMADU BELLO UNIVERSITY,, MAIN CAMPUS,, SAMARU-ZARIA