The paper presents two distinct case studies of long-time geoelectrical monitoring of aquifers contamination: an anthropic contamination, in fact a marine intrusion generated by the excessive exploitation of drinking water in Costineşti resort (located on the Romanian Black Sea shore), and a natural contamination due to meteoric water infiltrations along a faults system in the vicinity of Brazi oil refinery (Ploieşti region, Romania). Both the long-time monitoring of the marine intrusion from the Black Sea’s shore and the determination of meteoric water natural infiltrations dynamic along faults are confirmed by data obtained from hydrogeological wells. A possible method for the simulation of apparent resistivity anomalies within this context (media with a continuous variation of the resistivity) is represented by the application of harmonic alpha media theory.


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