3D behaviour of contamination in landfill sites using 2D resistivity/IP imaging: case studies in Portugal |
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| Authors: | E Martinho F Almeida |
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| Institution: | 1. Centro de Modeliza??o de Reservatórios Petrolíferos, Departamento de Engenharia de Minas, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001, Lisboa, Portugal
2. Departameto de Geociências, Universidade de Aveiro, 3810-193, Aveiro, Portugal
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| Abstract: | Aiming at defining a valid spatial contamination model, resistivity and induced polarization (IP) measurements were used to
investigate contamination plumes in the vicinity of two municipal landfills (Ovar and ílhavo). Previous geophysical surveys
and underground water samples confirmed the contamination. However 2D resistivity/IP surveys enabled in obtaining a more accurate
spatial model. The Ovar survey consisted of two profiles with nine Wenner soundings each; the ílhavo survey was carried out
along two individual lines using a Wenner standard pseudo-section. In both situations, negative IP values were found associated
with positive IP values, which can be explained mainly by 2D or 3D geometric effects caused by the presence of the conductive
plumes. The data were modelled using a 2D inversion program (RES2DINV) and the resulting resistivity and chargeability distributions
were displayed as pseudo-sections. The resistivity and chargeability pseudo-sections define the contamination plumes and the
sedimentary structure. These case studies illustrate the advantages of 2D resistivity/IP surveys for the mapping of shape
and dimension of contamination associated with landfills. |
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| Keywords: | Contamination plume Landfill Resistivity Chargeability 2D inversion Aveiro Portugal |
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