Interaction between shallow and deep aquifers in the Tivoli Plain (Central Italy) enhanced by groundwater extraction: A multi-isotope approach and geochemical modeling |
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| Authors: | Valentina Carucci Marco PetittaRamon Aravena |
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| Institution: | University of Rome “La Sapienza”, Dipartimento di Scienze della Terra, P.le Aldo Moro 5, Roma 00185, Italy |
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| Abstract: | In the Tivoli Plain (Rome, Central Italy) the interaction between shallow and deep groundwater flow systems enhanced by groundwater extraction has been investigated using isotopic and chemical tracers. A conceptual model of the groundwater flowpaths has been developed and verified by geochemical modeling. A combined hydrogeochemical and isotopic investigation using ion relationships such as DIC/Cl−, Ca/(Ca + Mg)/SO4/(SO4 + HCO3), and environmental isotopes (δ18O, δ2H, 87Sr/86Sr, δ34S and δ13C) was carried out in order to determine the sources of recharge of the aquifer, the origin of solutes and the mixing processes in groundwater of Tivoli Plain. Multivariate statistical methods such as principal component analysis and Cluster analyses have confirmed the existence of different geochemical facies and the role of mixing in the chemical composition of the groundwater. |
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