Investigating the near surface leachate movement in an open dumpsite using surficial ERT method
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Geoelectrical resistivity imaging technique was conducted at Abule-egba open
dumpsite, Lagos with intentions to monitor the movement of the contaminant leachate within the
near surface. The two survey traverses (T1 and T2) of 2D electrical resistivity tomography were
conducted using Wenner array configuration with minimum electrode spacing of 1 metre and
maximum data levels of seven. The inversion models revealed the two delineated geoelectrical
layers which are sandy-clay and sand units. The leachate fluids has the resistivity values of 5.75
– 10.4 Ωm at depth range of 2.5 – 4.0 metres along T1 and T2 moving from NW to the SE
section. The leachate fluids are capable of polluting shallow groundwater aquifer within the
study area and the residents are advised to drill deeper in the subsurface for clean and portable
groundwater resources.
Keywords: Environmental Geophysics, Leachates, Near-surface geophysics, Open dumpsite,
Electrical resistivity tomography (ERT)
Keywords
QC Physics