Abstract

The stable oxygen isotope composition of 11 wells, 4 pluviometers and 3 rivers are analysed and discussed in this paper in order to provide information on the recharge basin of aquifers and on the hydro-geological processes operating on groundwater. The studied area is situated in the northern part of Pordenone’s plain (NE Italy) and includes the Cellina - Meduna fan and the “risorgive line”. Samples were collected once a month with the exception of the main site at the Chions - Torrate locality where two wells, at a 50 and a 200 m depth, were sampled every two weeks. On the basis of the results, we identified three areas where aquifers are affected differently by meteoric water, when percolating through the unsaturated zone and the river water. In a few cases, only one of the two end members characterizes the groundwater.