The study of karstic aquifers by geodetic measurements in Friuli Venezia Giulia (North East Italy) for a water sustainable management

East Italy, in particular in the area of the Cansiglio Plateau and the Classical Karst. The tiltmeters are set in natural caves (Bus de la Genziana and Grotta Gigante) making part of two interesting karstic areas of particular hydro – geologic importance. These areas have high vulnerability. From the Friuli slopes of the karstic massif the Livenza River is born. The Classical Karst hosts the Timavo River aquifer. In the specific case of Cansiglio by means of comparison of the tilt- signal registered at the Genziana station with the pluviometrical series of Cansiglio and the hydrometric series of Livenza, local hydrologic effects have been observed and interpretations have been proposed. Putting in correlation also the GPS data of Caneva, a clear correspondence has been ascertained among the clinometric, satellite geodetic and hydro – pluvimetrical signals. The slow deformations recorded match the curves of run-off of the karstic aquifer, meanwhile one can observe also brief deformations correlable to conspicuous rain precipitations. We record hydrodynamics signals also by an analysis in the Classical Karst between Grotta Gigante pendulums and the River Timavo discharge. The purpose of research is to open a new multidisciplinary frontier between geodetic studies and studies of the karstic systems to obtain a better indirect knowledge of the underground hydric circulation and thus a more complete geologic description for a water sustainable management.