عنوان مقاله [English]
It is very important to study and simulate the transfer of environmental pollutants, especially leachate from waste accumulation in landfills. The aim of this study was to trace and simulate the path and depth of leachate transfer at downstream of Landfill using special electrical resistivity tomography. For this purpose, at the leachate accumulation site from the landfill of Hamadan city, two special resistance tomographic profiles in the northwest and southwest parts with a length of 52 m were taken at 2 meters electrode distances with a Wenner array. The results showed that the study area is of alluvial, sandstone and calcareous formations. Also, it was found that during the profile, the pattern of diffusion and infiltration of leachate from landfill was not similar, so that in profile 1, the leachate penetrated to the end at a distance of 30 to 40 meters to a depth of 3 meters, and in other parts of the profile, no deep penetration was observed. However, in the total length of profile 2, the penetration depth has reached to 2.5 meters and in the middle part up to 5 meters and more, which indicates the nonuniformity of leachate penetration along the profile. Therefore, it was found that the use of special electrical resistivity tomography method in two-dimensional imaging of landfill leachate diffusion will be more accurate and realistic than point studies. It is suggested that in feasibility studies to determine the landfill, the use of vertical electrical sounding methods and special electrical resistivity tomography should be prioritized due to low cost in the study of the depth and area of contamination and on the other hand, the effect these pollutants should be analyzed on the quality of downstream groundwater resources.