TWO – DIMENSIONAL ELECTRICAL IMAGING OF THE SUBSURFACE STRUCTURE OF BOMO DAM, ZARIA, NIGERIA
TWO – DIMENSIONAL ELECTRICAL IMAGING OF THE SUBSURFACE STRUCTURE OF BOMO DAM, ZARIA, NIGERIA
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Date
2007-12
Authors
OJO, OLUFEMI FELIX
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Abstract
2D electrical resistivity imaging was used to investigate the
subsurface structure of Bomo dam in Zaria, Kaduna state. The dam was
constructed by the institute of Agriculture Research, Ahmadu Bello
University, Zaria for irrigation purpose. The major characteristics of the
dam is that it is seasonal, it cannot hold its water throughout the year. The
geophysical survey was conducted to determine the depth to the
basement, the nature of the fracture system and the texture of the strata
underlying the dam.
A total number of five profiles were taken along the boundaries of
the Dam. The layout geometry for the electrical imaging was such that
two reels of cables were used with 5m intervals between the electrodes.
A total number of 42 electrodes were used. However, the two innermost
electrodes adjoining the two reels of cables coincided thus yielding a
total of 41electrodes and a spread length of 200m. The data obtained
using ABEM Terrameter SAS 4000 were processed using RES2DIVN software.
The resistivity inversion results for the profiles show that the near
surface material is not consolidated and that the weathered basement is
highly fractured. From these results, it can be concluded that the
seasonality of the dam is partly due to both the fracturing of the
basement and the unconsolidated nature of the overburden.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL, AHMADU
BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILMENT OF THE
REQUIREMENTS FOR THE AWARD OF THE DEGREE OF MASTER
OF SCIENCE IN APPLIED GEOPHYSICS
DEPARTMENT OF PHYSICS
FACULTY OF SCIENCE
AHMADU BELLO UNIVERSITY, ZARIA
DECEMBER, 2007
Keywords
TWO – DIMENSIONAL, ELECTRICAL IMAGING, SUBSURFACE STRUCTURE, BOMO DAM, ZARIA, NIGERIA