BEHAVIORASSESSMENT OF CONTAMINATION PLUME CONSIDERING DIFFERENT DISPERSIVITY COEFFICIENT VALUES

Abstract

This paper presents the results from numeric simulations using the Visual Modflow software for the uncontrolled landfill of Poços de Caldas area (State of Minas Gerais, Brazil). Geological, geotechnical, hydrogeological and climatic investigations were carried out for the area characterization. From these attributes the heterogeneity levels were assessed, and different dispersivity coefficient values were obtained. Based on these data and types of sources of pollutant, 11 sceneries were simulated. The results from each scenario were compared with the geophysical and field data for conformity analysis. The results from scenario 4 which considered vertical and horizontal dispersivity values with smaller differences among scenarios, showed good agreement with the geophysical and field data. The geometry and dimensions of the contamination plume did not change significantly with different dispersivity values considered for the area. Therefore the appropriate geologicalgeotechnical investigations allow for an adequate assessment of the heterogeneity characterization of the area and consequently a good approach of the dispersion parameters.