EVALUATION OF SURFACE WATER-GROUNDWATER MIXING DYNAMICS IN A SHALLOW COASTAL AQUIFER USING INTEGRATED GEOPHYSICAL AND GEOCHEMICAL METHODS
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Folorunso, A. F
Journal of Earth and Atmospheric Research, FUTA, Akure
This research work evaluates the dynamics of surface water-groundwater mixing using an open-ended Lake of Ugbo-Nla and the adjoining groundwater of the shallow coastal wells as a prototype study of surface water–groundwater interaction in coastal environment. Ten (10) surface water samples were collected from the lake at different positions using research boat while another ten (10) groundwater samples were collected from different shallow wells within the community opposite to the sea. The water samples were analysed using Atomic Absorption Spectroscopy (AAS) to determine the elemental concentrations. In addition, three Electrical Resistivity Tomography (ERT) profiles were equally established along the coast of the surface water body land-ward. Analysis of trace and major elemental compositions of water samples from the two water bodies reveal possible interaction between them. The ERT data also corroborate this interaction by showing low resistive zones at depth equivalent to the depth of the coastal shallow wells. Structure that mimic flow path was mapped out under profile 3 with high proximity to the surface water. The study has shown that active interaction exists between surface and underground water.
surface water, groundwater, mixing, major element, trace elements