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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)

ISSN:2141-7016

Article Title: Hydrogeochemical Geometry of Subsurface Layers in Odo-Oba Town, Southwestern Nigeria
by Adewoye, A. Olufunmi, Olayinka, A.I and Abimbola, A. F.

Abstract:
Groundwater occurrence and its chemical features in basement aquifers are often products of localized geological controls and structure. This study was aimed at delineating zones of groundwater occurrence in Odo-Oba near Ogbomoso as well as ascertaining its chemical features. Four Horizontal Resistivity Profiling (HRP) traverses were studied within Odo-Oba town and two control sites; 500m and 1000m away. These were followed by twelve Vertical Electrical Soundings (VES). The dipole-dipole and Schlumberger arrays were adopted for the HRP and VES, respectively .The VES data were filtered and inverted for correct depth matching using appropriate computer application software. Three to four subsurface geoelectric layers were identified. The resistivity and thickness of the topsoil ranged from 46.0 to 661.0 ?m, and 0.5 to 1.2m, respectively. The weathered bedrock with resistivity and thickness which ranged from 16.0 156.0 ?m and 1.5 26.0 m, respectively, were underlain by the fresh basement rock with resistivity of 124.0 ?m - ? and undeterminable thicknesses. These delineated unconfined and fractured basement aquifers. Low resistivity values (< 20.0 ?m) were recorded in stations close to the dumpsites, in contrast to high resistivity values (> 50.0 ?m) and (>80.0 ?m) obtained in VES stations sited within the town and at control sites respectively. Unconfined and fractured basement aquifers were delineated in Odo-Oba town. In conclusion, it was observed that distance is a major determinant of the seepage of the pollutants in the study area.The hand-dug wells that are closer to the waste dump site are vulnerable to pollution from the waste dump and this has caused both environmental and health risks among the populace. Hence, the need for identifying flaws in siting, design and construction of households wells and on-site waste disposal systems should be minimized with provisions of technical information by environmental protection establishment at the planning stage. Also continuous monitoring should be enforced to prevent an outbreak.
Keywords: aquifer, resistivity, dumpsite, health risks, odo oba town
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom

 

 

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