Análisis de sensibilidad de la tomografía eléctrica para la cartografía de la vulnerabilidad de las aguas subterráneas a la contaminación difusa

• Autores: Mahjoub Himi, Josefina C. Tapias Pantebre, J.A.B. Sabadía, R. Mota, L. Rivero, A. Casas Planes
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 1, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España (Zaragoza, 12-15 julio, 2004)), págs. 339-342
• Idioma: español
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• Resumen

  • The impact of agricultural practices on groundwater quality is a particular concern by the fact that shallow wells may become polluted. In order to protect groundwater there is an increasing demand for vulnerability maps which illustrate the exposure of aquifers against pollution. These maps are designed to show areas of greatest potential for groundwater contamination on the basis of local subsurface conditions. Parameters affecting vulnerability are mainly permeability and thickness of each protective layer. Tor unconsolidated sediments, the permeability is strongly related to the clay content, which can be deduced from indirect resistivity methods, like electrical-imaging. Such geophysical method can be of great help in groundwater vulnerability studies because they disturb neither the structure nor the dynamics of the soil. In this paper the usefulness of the electrical imaging technique for assessing aquifer vulnerability is demonstrated.