AQUIFER CHARACTERIZATION ANALYSIS USING GEOELECTICAL PARAMETERS: A
Keywords:
Electrical resistivity, Geo-electrical parameters, Protective Capacity, AquiferAbstract
The groundwater potential and protective capacity of road 4 Olabisi Onabanjo University premises was investigated using Electrical resistivity method. The method was used to determine the depth to basement of locations in the study area to delineate possible groundwater potential and its protective capacity. Ten (10) VES were conducted using Schlumberger configuration for the data acquisition at 5 m interval from each station using SAS 1000 terrameter. The field data were analyzed using manual and computer iterations. The Geo-electrical parameters analyzed include resistivity and thickness of Topsoil, Weathered and Fractured/Fresh
basement resistivity and thickness and depth to basement. The interpretation delineates three layers overlying the fresh basement. These layers are topsoil, weathered layer and the fresh basement. The topsoil has resistivity values that range between 59.6-1013.5 Ωm with thickness range of 0.7-2.7 m, weathered layer has the resistivity value ranging from 53.4-266.2 Ωm with thickness ranging from 8.8-30.2 Ωm which is composed of medium sand with few clay. The curve types obtained were KH, HA and H with about 60% of KH curve. The last layer has the resistivity value of 307.8-2329.6 Ωm. The longitudinal conductance, hydraulic conductance, transmissivity and overburden thickness values and maps were also generated to characterize the aquifer of the study area. The protective capacity rating of the study area is rated poor, weak and moderate, but the moderate zones have the highest portion of the study area. VES 1, 2, 5 and 6 were grouped as moderate groundwater protective zones and it’s located at the northern part of the study area. The depth to
basement ranges between 12.5-36.1 m while the overburden thickness values ranges between 8.8 to 30.2 m. The study area is said to have good groundwater potential and protective capacity.
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