Browsing by Author "Ozobeme, A.A."

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    3D TIME-LAPSE GEOPHYSICAL IMAGING OF FERTILIZER-INDUCED SOIL AND GROUNDWATER CONTAMINATION IN OGHARA, DELTA STATE, NIGERIA
    (Zibeline International Publishing, 2025-07) Ozobeme, A.A.; Osisanya, W.O.; Airen, O.J.; Eyankware, O.M.; Iluobe, E.O.
    Fertilizer contaminants can persist in subsurface environments, making remediation efforts costly and time consuming, particularly in areas with shallow aquifers and permeable soils. This study applied time-lapse geophysical methods to assess fertilizer-related soil and groundwater pollution in agricultural regions of Oghara, Delta State, Nigeria. Eight 2-D electrical resistivity imaging (ERI) surveys were conducted, Including 16 grid-aligned lines across the Presco lowland and upland areas which were collated to form the 3 D models, along with a control line. Data were processed using RES3DINV and ZondRes3D to produce the 3-D resistivity models. Three-dimensional slices illustrated the downward migration of contaminants over time. Analysis of time-lapse data showed maximum vertical migration rates of 216.7 cm/month and horizontal rates of 750.0 cm/month at the initial site. At the second site, rates reached 122.5 cm/month vertically and 500.0 cm/month horizontally. Taking into account local hydrological and geological conditions, the contaminant plumes are projected to reach the dry sandy layer within 0.5 to 1 year.