2D and 3D resistivity inversion at a large urban solid waste in Buenos Aires Province, Argentina

POMPOSIELLO, MARIA CRISTINA; FAVETTO, ALICIA; DAPEÑA, CRISTINA

El Vendrell, España

Workshop; 18th International Workshop on Electromagnetic Induction in the Earth El Vendrell; 2006

American Geophysical Union (AGU)

This paper presents the preliminary geophysical results of a multidisciplinaryproject at an urban solid waste in Buenos Aires Province, Argentina. Multielectroderesistivity data were acquired inside the landfill areas along parallelsurvey lines. 2D and 3D inversion of data show sectors with large resistivitycontrast within the wastes. The conductive anomalous zones were interpreted asaccumulation of leachate because the electrical conductivity of landfill leachateis often so much higher than that of the natural groundwater. These bodiesof leachate present low values of resistivity between 2 and 5 ohm-m and arelocated discontinuous bellow 5 m depth. The predicted electrical conductivityof leachate is around 2570 mS/m and this value is of the same order of specificconductivity measured in leachate samples (3000 mS/m). The large amountof leachate observed is mainly function of low gradient of the landfill area, themeteorological and hydrogeological factors and the effectiveness of the capping.These results are a useful contribution to check environmental impacts causedby the solid waste disposal in this area.