APPLICATION OF O-H-B-Sr ISOTOPE SYSTEMATICS TO THE EXPLORATION OF SALINIZATION AND FLUSHING IN COASTAL AQUIFERS : PRELIMINARY DATA FROM THE PIALASSA BAIONA ECOSYSTEM (ADRIATIC SEA)

Riccardo Petrini, Maddalena Pennisi, Alessandra Adorni Braccesi, Barbara Stenni, Onelio Flora, Umberto Aviani

Abstract


O, H, B and Sr isotopes were identified from surface-waters, ground-waters and waters percolating in soils at the Pialassa Baiona lagoon and nearby inland areas. The preliminary data demonstrate the occurrence of both conservative mixtures between seawater and freshwaters and cation exchange at the salt/fresh water interface during the intrusion. The O and H isotopes indicate that the freshwater component in the binary mixing had the isotopic features of the rainwater from Apennine catchments. Coupled O-H-B isotopes also show that the major contribution of the moving seawater was confined to the deeper aquifers and some of the soil waters. The Sr isotopes highlight the role of cation exchanges when seawater flushes freshwater aquifers, and allow the recognition of the different components of the solute. Deviations from these processes as revealed by B isotopes are interpreted as the evidence of possible anthropogenic inputs.


Keywords


Stable-isotope geochemistry; saltwater intrusion; coastal aquifers;Pialassa Baiona

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References


ABBIATI M. (2003) Problematiche ambientali delle lagune costiere; La Pialassa della Baiona. Qualità dell'ambiente e attività di ricerca, a cura di CIRSA, Università di Bologna in Ravenna e Comune di Ravenna, pp. 9-15. Ed. La Mandragora, Imola (BO).

AMOROSI A, COLALONGO M L, PASINI G, PRETI D. (1999) Sedimentary response to Late Quaternary sea-level changes in the Romagna coastal plain (northern Italy). Sedimentology 46:99-121.

GABBIANELLI G, ASCANI C, SANGIORGI F, PONTI M. (2003) Il sistema lagunare delle Pialasse ravennati (Baiona-Piomboni): lineamenti geomorfologici, sedimentologici ed evolutivi; La Pialassa della Baiona. Qualità dell'ambiente e attività di ricerca, a cura di CIRSA, Università di Bologna in Ravenna e Comune di Ravenna, pp. 19-48. Ed. La Mandragora, Imola (BO).

LAMBRAKIS N. (2006). Multicomponent heterovalent chromatography in aquifers. Modelling salinization and freshening phenomena in field conditions. J. Hydrol. 323:230-243.

MICHAEL H A, MULLIGAN A, HARVEY C F. (2005) Seasonal oscillations in water exchange between aquifers and the coastal ocean. Nature 436: 1145-1148.

TEATINI P, FERRONATO M, GAMBOLATI G, BERTONI W, GONELLA M. (2005) A century of land subsidence in Ravenna, Italy; Environ. Geol. 47:831-846.




DOI: 10.6092/issn.2281-4485/3811

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Copyright (c) 2009 Riccardo Petrini, Maddalena Pennisi, Alessandra Adorni Braccesi, Barbara Stenni, Onelio Flora, Umberto Aviani

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