A review of the self-potential method applied on ...

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XVI International Conference on Computational Methods in Water Resources (CMWR-XVI) Ingeniørhuset

A review of the self-potential method applied on groundwater resources
Author:Véronique Naudet <vero_naudet@yahoo.fr> (Lancaster University)
Presenter:Véronique Naudet <vero_naudet@yahoo.fr> (Lancaster University)
Date: 2006-06-18     Track: Special Sessions     Session: Hydrogeophysical data fusion

Standard geophysical methods detect the presence of water by changes of ground physical properties, but none of them are sensitive to actual groundwater flow, except the Self-Potential (SP) method. This method consists of measuring the natural electric field within the subsurface with non-polarisable electrodes. After correcting for telluric currents and cultural noise, the remaining electrical potentials are related to natural polarisation mechanisms occurring at depth. The main contributions of SP-signals are associated to groundwater flow through the electrokinetic effect and organic matter-rich contaminant plumes through the “electro-redox” effect. We will present a review of recent advances in theoretical and experimental aspects of the SP method to improve our knowledge on the relationship between SP-signals and hydro-geochemical properties. These researches can therefore open the door to the inversion of SP-signals to resolve some pertinent information about the groundwater flow and contaminant transport, such as hydraulic conductivity, geometry of the aquifer, and redox potential values.