Geophysical Investigation of Leachate Migration and Groundwater Interaction at the Former Agoe Nyive Landfill, Southern Togo

This research investigates the subsurface migration of landfill leachate and its interaction with shallow groundwater at the former Agoe Nyive landfill in southern Togo. Magnetic surveying and electrical resistivity tomography were applied to delineate contaminant pathways and identify zones of altered subsurface properties. Magnetic data revealed surface and intermediate depth anomalies forming a probable flow corridor, while resistivity values as low as 5 ohm.m between 15 and 23.5 meters depth indicated highly conductive zones consistent with leachate accumulation. The results suggest that the contaminant plume remains largely confined to shallow and intermediate layers, with direct contact observed between leachate and the shallow aquifer whose static level ranges from 5 to 10 meters. The study provides a geophysical basis for groundwater risk assessment in urban landfill environments.