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Home  >  Volume 33

Effect of Variable Flow Parameters on Saltwater Intrusion in Coastal Aquifer by James A. Adegoke , Olatunde I. Popoola and Oludotun O. Faluyi (Pages 277-284)
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In coastal regions, successive pumping causes seawater intrusion, consequently leading to the pollution of the groundwater and corroding subsurface structures. This work was designed to investigate the effect of geophysical and hydrological parameters such as porosity, hydraulic conductivity, diffused coefficient and hydraulic gradient on variable-density groundwater flow and transport model. Values of these parameters were determined experimentally by using a set up that consisted two arms of cylindrical glass tube with a control valve at the centre. Soaked sand samples were arranged in ascending order of porosity to form heterogeneous layers from both sides of the controlled valve horizontally. Saltwater of known density was filled into one arm and freshwater on the other arm, the valve was opened to allow flow of water in the set up. This procedure was repeated for descending order of porosity and for each homogeneous sample. Hydraulic gradient, hydraulic conductivity and diffused coefficient were obtained from the experimental procedure. Results showed that the arrangement that gives high percentage of reduction of saltwater intrusion was when the porosity was in ascending order because it yielded lower hydraulic conductivity and lower volume flux which determines the mass flux of dissolved salts.

                Keywords: Seawater intrusion, groundwater, hydraulic gradient, hydraulic conductivity, porosity and aquifer