GPR utilizado na deteção da geometria de cavas usadas para disposição de resíduos de óleos lubrificantes

Abstract

ABSTRACT.A variety of environmental problems occurs due to the inadequate disposition of residues. Applied geophysics methodologies to environmental studies show great results in the investigation of contaminating. GPR is a practical and fast geophysical method in such investigations, because the electromagnetic signal assists in the delimitation of the contaminating, addressing direct techniques of investigation (boreholes and wells). This study was developed in an old disposition area to residues lubricants oils (dense nonaqueous phase liquids -DNAPL) in the municipal district of Ribeirão Preto, São Paulo State. This area is situated in the geological domains of the basaltic floods of the Serra Geral Formation and sandstones of the Botucatu Formation. GPR acquisition was carried out inside and next to 4 ditches of residues disposition, with 100 MHz unshielded antennas, enabling a maximum investigation depth of 7 meters. The limits and of the ditches base can be identify in the GPR sections, except in the ditch 1, which the base is not delineated by GPR. The results show that GPR signal is much attenuated below ditches. This fact could be result of a bacteriological activity in the residue or increase of dissolved salts in the soil caused by acid pH of the residue.

Investigação geofísica 2D e 3D com aplicação em meio ambiente: estudo sobre uma área de disposição de resíduos de óleo lubrificante no município de Ribeirão Preto - SP

“…cit. ) O GPR mostra bons resultados na identificação e monitoramento de plumas de contaminação de hidrocarbonetos (DAVIS e ANNAN, 1989;ATEKWANA et al, 2000;CASTRO e BRANCO, 2003;BORGES et al, 2006). Daniels et al (op.…”

“…Dentro desse contexto o método da eletrorresistividade, seguramente, é o método geofísico mais utilizado, devido à possibilidade de aplicação nos diversos campos de estudo, como: mineração (GALLAS, 2000), geologia de engenharia (ELIS, 1993;BRAGA, 1997), hidrogeologia (CUTRIM et al, 2007BRAGA, 2008), estudos ambientais (LIMA et al, 1995;PORSANI et al, 2004;GALLAS et al, 2005;FACHIN, 2006;LAGO et al, 2006) e estudos agrícolas (NASCIMENTO, 2008).…”