Self-potential monitoring of a crude oil-contaminated site (Trecate, Italy)

摘要: We present a multidisciplinary approach for characterization of crude oil-contaminated site (Trecate, Italy), integrating geophysical data, such as subsoil electrical potential (in millivolts) and resistivity ohm meters) distribution, with hydrogeological bio-chemical data. Self-potential measurements have been evaluated together active geoelectrical hydrological information, to provide spatial temporal information about the self-potential sources their possible correlations contamination state subsoil. Three surveys (March 2010, October March 2011) were conducted at site, both in contaminated uncontaminated regions. The obtained maps show large time-lapse differences correspondence area, positive values (up 50 mV) spring an dipolar distribution (2010) survey (amplitude from −15 25 mV). To understand origin measured signals, model using vertical was built, taking into account deduced tomography. source identification allows Trecate be better delineated. In particular, two contributions are superimposed: electrokinetic mechanism is predominant spring, while redox represents most important contribution autumn.