EVALUACIÓN DEL ESTADO ACTUAL DE SITIOS DE DISPOSICIÓN FINAL DE RESIDUOS SÓLIDOS URBANOS APLICANDO TÉCNICAS GEOFÍSICAS

POMPOSIELLO, MARIA CRISTINA; FAVETTO, ALICIA; BOUJON, PAMELA; DAPEÑA, CRISTINA; OSTERA, HECTOR

Revista de Geología Aplicada a la Ingeniería y al Ambiente

ASAGAI - Asociacion Argentina de Geología Aplicada a la Ingeniería -

Lugar: Buenos Aires; Año: 2008 vol. 22 p. 123 - 133

1851-7838

This paper presents the geophysical results of a multidisciplinary project at two landfills, one in Gualeguaychú city, Province of Entre Ríos, and other in San Carlos de Bariloche city, Province of Rio Negro, Argentina. Several geoelectric studies, horizontal profiling and vertical sounding using dipole-dipole and Schlumberger electrode configurations respectively were done. Bidimensional (2D) and unidimensional (1D) resistivity models were obtained inside and outside the landfill area. In this way, it is possible determined lateral and vertical changes in the electrical resistivities in the survey sites. Furthermore, GPR profiles with 150–500 MHz antennae were surveyed, inside and outside the landfill. The main objectives of the GPR surveys were to determine the depth of the solid wastes and the zones which are in contact with leachate. The upper limit of the contaminant plume was identified along the profile by the absence of reflectors or the existence of very weak signals. In the Gualeguychu landfill, below the wastes anomalous conductivity zones which reach 10 m deep due to the leachate have been detected. In addition, the models obtained outside the landfill boundaries show contamination zones for the leachate migration through the groundwater flow. The geophysical studies carried out at San Carlos de Bariloche landfill show the presence of two sectors. These zones are characterized by a low resistivity, compatible with the existence of contamination plumes up to depth no less than 20 meters. The geoelectric studies and GPR results show a good agreement at both places.