Geoelectrical investigations by means of resistivity methods in karst areas in Romania |
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| Authors: | Horia Mitrofan Ioan Povar? Mihai Mafteiu |
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| Institution: | (1) “Sabba S. Stefanescu” Institute of Geodynamics of the Romanian Academy, Bucharest, Romania;(2) “Emil G. Racovita” Institute of Speleology of the Romanian Academy, 31 Frumoasa str, 78114 Bucuresti, Romania;(3) School of Geology and Geophysics, The University of Bucharest, Bucharest, Romania |
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| Abstract: | The applicability of resistivity methods to ground water investigations is well recognized. As water-saturated rock formations
have a lower electrical resistivity than dry ones, an electrical resistivity survey should result in low resistivity anomalies. Normally, such anomalies are interpreted to indicate areas of potentially significant ground water flows. In karst areas,
however, interpretation may not be as straightforward: for example, large electrically conductive domains can represent water bearing zones, whose fluid-permeability may be poor; alternatively, fast flow conduits, which
may be unsaturated, occur as slender objects, and not as clear anomalous features. In order to deal with such extreme heterogeneities,
resistivity investigations require some specific adjustments. One example is the so-called “mise à la masse” method. In Romania,
it was used to trace the cold karst water inflows that detrimentally affected the commercial exploitation of a thermal spring,
Hercules at Baile Herculane. Conventional geoelectrical approaches––such as using resistivity highs to detect air-filled cave passages,
are proved to be less efficient in the considered karst investigations. |
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| Keywords: | Resistivity Karst Mise à la masse Hercules spring Romania |
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