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Abstract
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Article Information:
Anisotropic Properties of Fractures in Parts of Ibadan, Southwestern Nigeria: Using Azimuthal Resistivity Survey (ARS)
O.M. Ajibade, G.O. Ogungbesan, O.A. Afolabi and T. Adesomi
Corresponding Author: G.O. Ogungbesan
Submitted: December 02, 2011
Accepted: January 04, 2012
Published: April 15, 2012 |
Abstract:
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This study investigated the groundwater potentials and anisotropic properties of fractures for
sustainable groundwater development within Ibadan metropolis. Eighteen Vertical Electrical Sounding (VES)
and three Azimuthal Resistivity Surveys (ARS) were conducted in an area covering about 135km2 in
northeastern part of Ibadan. Graphical interpretation of the VES data revealed the area to be underlain by three
to four geo-electric layers; top soil (14.7 to 441.4 Sm), weathered layer (2.95 to 712 Sm), fractured bedrock
(10.0 to 255 Sm) and fresh/basal bedrock (307.6 to 2188.8 Sm) with depth to fracture systems ranging from
15-160m. The directions of electrical anisotropy lie dominantly at NW-SE and NE-SW, while N-S and W-E
are less prominent. Coefficient of anisotropy ranges between 8.79 and 1.0 and fracturing porosity varies
between 1.62 and 0.01 assuming the anisotropy is due to fracturing. Result of groundwater head contouring also
showed that groundwater flow is dominantly in NW-SE and NE-SW directions which possibly could be
associated to fracture-controlled flow.
Key words: Anisotropy, electrical resistivity, fracture porosity, groundwater flow, , ,
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Abstract
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Cite this Reference:
O.M. Ajibade, G.O. Ogungbesan, O.A. Afolabi and T. Adesomi, . Anisotropic Properties of Fractures in Parts of Ibadan, Southwestern Nigeria: Using Azimuthal Resistivity Survey (ARS). Research Journal of Environmental and Earth Sciences, (04): 390-396.
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ISSN (Online): 2041-0492
ISSN (Print): 2041-0484 |
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