Assessment of shallow aquiferous units and their coefficients of anisotropy in the coastal plain sands of Southern Ukanafun local government area, Akwa Ibom State, Southern Nigeria

By N.J George, V.I Obianwu, A.E Akpan and I.B Obot


Abstract

The aquiferous sandy units of the Continental Plain sands built on silicic deposits of high energy Niger Delta were investigated for both the primary and secondary parameters in southern Ukanafun Local Government Area of Akwa Ibom State, southern Nigeria. The investigation was done using electrical resistivity method employing vertical electrical sounding method. Results were examined by correlating the analyzed data with local geology, bore well data in the study area and other available constraints of striking geologic evidences were juxtaposed with inferred geoelectric data interpretation as caveats towards improving the reliability and validity of the interpretation.  The results show that aquiferous sandy units assessed within the maximum current electrode separations were fairly isotropic as the transverse resistivity for each layer shows little or no variations with respect to the longitudinal resistivity. This was reflected by each layer having coefficient of anisotropy or pseudo-anisotropy as approximately 1.

 

Key Words : Aquiferous units, coefficient of anisotropy, secondary parameters, Continental Plain sand, Ukanafun and isotropy

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