Differenziazione idrochimica e isotopica dei circuiti idrici sotterranei nel settore sud-occidentale della pianura piemontese

In the subsoil of the Piedmont plain, groundwater generally flows through two principal aquifer systems. A superficial aquifer complex constituted by fluvial and glaciofluvial quaternary deposits and a deeper aquifer complex represented by Plio-Pleistocene deltaic deposits and in some cases Pliocene marine sands. These two hydrogeological complexes are generally well distinguished for lithologic separations. In the present study, the groundwater of two sample zones in the south-western Piedmont plain, whose subsoil is characterized by lack of evident separating levels, has been investigated from a geochemical and isotopic point of view. The shallow groundwater shows electrical conductivity and total dissolved salts about twice the levels of deeper groundwater, so revealing the existence of differentiated circuits as in the rest of the region. First stable isotopes analyses show higher recharge zones for deeper groundwater flow paths compared to the shallow ones.