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Mapping underground aquifers using direct-current resistivity and induced polarization.


The main research objective is to assess the capabilities of direct-current resistively and induced. polarization methods to provide reliable and extensive hydro geological information of practical use. The sustainable management of groundwater resources necessitates the definition of protection measures in sensitive areas. An extensive and enough detailed cartography is therefore needed and should be possibly linked to transport properties. Wells provide a direct, but very localized access to hydraulic parameters. A good quality interpolation between the wells requires the use of geophysical methods Among them, DC resistively and induced polarization is of particular interest because of their sensitivity to water content, salinity and porosity in ground materials. They now enable a 3D imaging of large volumes at a relatively low cost. Since their capabilities depend on the geological context, we propose an assessment of their performance and limits on at least two test sites. At first, two different sites will be selected, gathering the relevant available documentation. A preliminary numerical study will help to define a measurement procedure for the measurement campaign that will follow. The resistively and induced polarization data will be jointly interpreted, using a priori information, to build an image of the hydro geological structure. The results will be assessed considering hydro geologists' needs. If necessary, an improved methodology will be proposed. Long-term aims are the definition of applicability and limits of the methods, regarding their reliability and use at a large scale. The results will be part of a database, this allowing later improved processing's and comparisons with other methods.

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Paradisgatan 2
221 00 Lund

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