A comprehensive hydrogeological view of the Friuli alluvial plain by means of a multi-annual quantitative and qualitative research survey

In order to define a global hydrogeological model of the Friuli alluvial plain, the present work investigates the relationships between the regional unconfined and multilayered aquifer systems integrating geological, hydrogeological, geochemical and isotope data. The Neogenic and Quaternary mostly clastic sediments of both continental and marine origin, locally more than 1000 meters thick, gave rise to a sequence of megafan-shaped progradated sedimentary bodies, both lenghtwise and crosswise granulometrically differentiated. The geometry of the relating saturated zone has been reconstructed by both deterministic and stochastic methods. By means of the isophreatic map of the High Plain (APF), the active recharge to the confined system of the Low Plain (BPF) has been calculated. The groundwater flow conditioning by means of the regional tecto-dynamics is showed. The hydrogeological model, integrated with hydrogeochemical and isotope data collected from wells, springs and rivers, allowed some considerations about recharge provenience and hydraulic connection within the confined aquifer system.