Anàlisi de la intrusió marina derivada de l’extracció d’aigua per a l’abastament urbà a Ciutadella (Menorca, Illes Balears, Mediterrània Occidental)

The Hydrogeological
Unit Migjorn is composed of an Upper Miocene carbonate platform and represents
the main water resource in the island of Menorca. This unit is affected by general
seawater intrusion process preferably in the west. This study, integrating techniques
of Electrical Resistivity Tomography (ERT) with hydrochemical data analysis from
wells of urban water supply and correlation of borehole logs of these wells, allows
new contributions to the knowledge of the hydrogeological problem in the town of
Ciutadella de Menorca. Analysis of hydrochemical facies and its temporal evolution
indicate all samples show chloride facies without exception, but with a very different
distribution of chloride ion concentrations. This distribution is justified by the
presence of collapse structures and karstifications detected by Electrical Resistivity
Tomography, as well as textural variability of materials where the pumping occurs