Geophysical prospecting of the landfill near Mydlovary-Zahaji in Southern Bohemia

Geoelectric methods of measurement are well suited for inorganic contaminants (salt, acid, lye) that affect the groundwater resistance. There are many publications on the interdependence between rock resistance and groundwater resistance. The so-called formation factor, i.e. the ratio between these two parameters, was defined by Archie already in 1942. Further research was done on the influence of clay and coarse clay on the formation factor. It was found that (especially at higher electrolyte concentrations) the dependence of rock resistance on groundwater resistance is always valid and is used in practice for assessing the groundwater resistance in petroleum prospecting. This is the theoretical basis for the use of geoelectric resistance method in the detection and mapping of soil pollution. Abandoned mining areas are quite often contaminated with residues of inorganic chemicals left over from metal extraction. Former industrial sites are often sources of groundwater contamination. The contribution presents an example from Southern Bohemia