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The use of electrical conductivity mapping in the definition of an aquifer vulnerability index
Ist Teil von
Near surface geophysics (Online), 2003-02, Vol.1 (1), p.13-19
Erscheinungsjahr
2003
Link zum Volltext
Quelle
Wiley Online Library All Journals
Beschreibungen/Notizen
ABSTRACT There is an increasing demand for vulnerability maps which show the degree of exposure of aquifers against pollution. Parameters shown in these maps are generally cation exchange capacity or clay content of the near surface layers, or quantities related to the infiltration time of surface water. Instead of determining these parameters by means of drillings and geological investigation, we propose the use of geophysical techniques for vulnerability mapping and for the interpolation between drillings. A geophysical quantity which is closely related to these parameters is the electrical conductivity. In this paper the relation between clay content and electrical conductivity is shown and used for vulnerability mapping. It is demonstrated that ground and airborne electromagnetic (EM) techniques are suited for large scale data acquisition.