I found in my field study to search for groundwater by electric exploration that when the topsoil is saturated with salts, the results of the search for groundwater are inaccurate and sometimes the device does not give the results at all.
Well,
100% your observation is correct, and salts on the surface or in the soil cause major problems in the case of electrical exploration, and therefore replace the resistivity method by the method of refractive seismic to achieve the desired goal.
Regards
In geophysical prospecting by electrical method (hydrogeological prospection), saliferous soils (resistant) distort the data, preferably use the seismic reflection method.
Salinity of the top soil increases the electrical conductance of the soil and allows the electric current to pass between electrodes at the surface itself. This prevents the deeper penetration of the electrical signals, reducing the strength of the signals received at the other end, thereby affecting the efficacy of ground water detection at depth.
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