Le tecniche geofisiche per lo studio degli acquiferi costieri soggetti ad intrusione marina: l’acquifero di Petrosino (TP)

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Abstract

[automatically translated] A geophysical survey was conducted in the coastal area of Petrosino, located in South-Western Sicily between the towns of Marsala and Mazara del Vallo, a time for the study of evolution of the phenomenon of seawater intrusion in the coastal aquifer, accentuated presumably by human activities. The over-exploitation of ground water due to intensive agricultural use has changed significantly the natural hydro-geochemical structure of the basin, emphasizing the intrusive phenomenon already critical in the area. The study was based on the development of integrated hydro-geological data, geochemical and geophysical (electromagnetic surveys TDEM), available thanks to previous work in the area, with new geophysical measurements carried out between 2009 and 2010. In particular in these two years were performed electrical resistivity tomography (ERT) in seasonally, new TDEM surveys, seismic surveys and surface waves (MASW). The processing and integrated interpretation of geophysical data have allowed us to develop a three-dimensional model of the electrical resistivity of the aquifer, which aims to define the extent and geometry of the intrusion of seawater. Moreover, the comparison and the correlation between the data geophysical and geochemical data, geological and hydrogeological allowed to discriminate the effects of salt concentration of the water table, the porosity and the degree of saturation of the rocks, on the variation of the measured electrical resistivity and estimate the average porosity of the rocks forming the reservoir.
Original languageItalian
Pages (from-to)15-30
Number of pages16
JournalGEOLOGI DI SICILIA
Volume19
Publication statusPublished - 2011

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