Análise comparativa entre arranjos de imageamento elétrico no modelamento de pluma de contaminação e cone de depressão

• Autor(a) principal: Silva, Julio Cesar da [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/143987; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2016-08-18/000868880.pdf
• topic: Geofisica; Tomografia sismica; Geologia; Hidrogeologia; Rio Claro (SP)

This paper makes a comparative analysis between the Dipole-dipole, Wenner and Schlumberger arrays through electric resistivity tomography (ERT), as the sensitivity and resolution in the spatial characterization of infiltrating pollutants in septic tank and cone of depression in well water, both contained in unconfined aquifer. Data acquisition consisted of electrical resistivity readings using five parallel lines with 105m long, electrode spacing and lines of 5m. The data from each line were subjected to 2D inversion, then interpolated to generate 3D blocks, which was extracted from a fixed resistivity isosurface (620 Ω.m), which enabled the modeling of volumes related the flow structures. The results for the Dipole-dipole array allowed the modeling of the cylindrical structure associated the well water, and an isosurface deformation associated septic tank, but did not allow the modeling of the plume. The data for the Schlumberger array cannot be recognized cone, but resulted in a drop shape model, associated with septic tank and similar to a contamination plume. The Wenner array resulted in a model with structure in elongated keel format associated with the cone of depression, and another that is similar drop shape model similar to a contamination plume. The comparative analysis shows that the Dipole-dipole array is recommended in works of modeling vertically integrated three-dimensional structures of high resistivity in the saturated zone. The Wenner and Schlumberger arrays are recommended to modeling vertically integrated three-dimensional structures of low resistivity in the unsaturated zone, with emphasis on the Schlumberger array