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Integrated Geoelectrical Resistivity m.thod for Environm.ntal Assessm.nt of Landfill Leachate Pollution and Aquifer Vulnerability Studies

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Journal of Geoscience and Environm.nt Protection 2022年第9期10卷 1-26页

作者： Stanley U. Eze omafume m. orji Abriku E. Onoriode Saleh A. Saleh m.cpaul O. Abolarin Departm.nt of Earth Sciences Federal University of Petroleum Resources Effurun Nigeria Departm.nt of Petroleum.Engineering and Geosciences Petroleum Training Institute Effurun Nigeria Departm.nt of Physics Delta State University Abraka Nigeria

Leachate plum.s from.landfills are a m.jor source of pollution in Nigeria, especially in urban areas. Assessing leachate contam.nation in the subsoil is considered a com.lex process that needs detailed field m.asurem.nt to accurately define the extent of contam.nation. To ascertain the extent of pollution of the subsoil and groundwater sources which were reportedly contam.nated by leachate plum.s from.an old dum.site located in Osubi town, an integrated geo-electrical m.thod involving 1-D vertical electrical sounding (VES) and 2-D, 3-D ERT techniques were em.loyed. Orthogonal set of 2-D apparent resistivity data was collected in a 100 × 50 m.sup>2 rectangular grid around the dum.site, using the Wenner array. Two years later, three (3) 2-D resistivity im.ging profiles were also recorded in tim.-lapse m.de at the dum.site to m.nitor the possible effects of attenuation on the leachate over tim.. Ten (10) VES data were also acquired and used along with the 2-D im.ging data. 2-D apparent resistivity data were inverted with Dipprowin software program. The orthogonal set of 2-D lines of apparent resistivity was m.rged into 3-D data and inverted with RES3DINV program.to create a 3-D subsurface resistivity m.del. Geological m.dels observed from.2-D and 3-D resistivity inversion revealed low resistivity values in the order ρ Ω·m.which is indicative of leachate plum.s in the saturation zone (pore water). The 2-D resistivity-depth sections im.ged low resistivity leachate plum.s at the near surface (m. to a depth of 25.0 m. while 3-D inversion depth slices im.ged leachate contam.nant within the first, second and third layers at depth ranging from.0.00 - 2.50 m. 2.50 - 5.38 m.and 5.38 - 8.68 m.respectively. Thus, leachate contam.nation clearly increased with depth beyond the depth of first and second aquifers in the area which im.lies that available groundwater for dom.stic use is already contam.nated with leachate from.the dum.site. Leachate contam.nant-depth m.p estim.

关键词： Leachate Contam.nation Groundwater Pollution 2D and 3D Electrical Resistivity Tom.graphy (ERT) Aquifer Vulnerability Environm.ntal Assessm.nt

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