Case study: a 3D resistivity and induced polarization imaging from downstream a waste disposal site in Brazil

Springer Science and Business Media LLC - Tập 66 - Trang 763-772 - 2011
Andréa Teixeira Ustra1, Vagner Roberto Elis1, Giulliana Mondelli2, Lázaro Valentin Zuquette3, Heraldo Luiz Giacheti4
1Institute of Astronomy, Geophysics, and Atmospheric Sciences, Universidade de São Paulo, São Paulo, Brazil
2Instituto de Pesquisas Tecnológicas do Estado de São Paulo, Centro de Tecnologias Ambientais e Energéticas - CETAE, São Paulo, Brazil
3Department of Geotechnical Engineering, Universidade de São Paulo, São Carlos, Brazil
4Department of Civil Engineering, Universidade Estadual Paulista, Bauru, Brazil

Tóm tắt

A contaminated site from a downstream municipal solid waste disposal site in Brazil was investigated by using a 3D resistivity and induced polarization (IP) imaging technique. This investigation purpose was to detect and delineate contamination plume produced by wastes. The area was selected based on previous geophysical investigations, and chemical analyses carried out in the site, indicating the presence of a contamination plume in the area. Resistivity model has successfully imaged waste presence (ρ < 20 Ωm), water table depth, and groundwater flow direction. A conductive anomaly (ρ < 20 Ωm) outside wastes placement was interpreted as a contamination plume. Chargeability model was also able to imaging waste presence (m > 31 mV/V), water table depth, and groundwater flow direction. A higher chargeability zone (m > 31 mV/V) outside wastes placement and following conductive anomaly was interpreted as a contamination plume. Normalized chargeability (MN = m/ρ) confirmed polarizable zone, which could be an effect of a salinity increase (contamination plume), and the clay presence in the environment.

Tài liệu tham khảo

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