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.
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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
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TWO – DIMENSIONAL, ELECTRICAL IMAGING, SUBSURFACE STRUCTURE, BOMO DAM, ZARIA, NIGERIA
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