NDLI: The alluvial aquifer of the Lower Magra Basin (La Spezia, Italy): conceptual hydrogeochemical–hydrogeological model, behavior of solutes, and groundwater dynamics

Content Provider	Springer Nature Link
Author	Brozzo, Gianpiero Accornero, Marina Marini, Luigi
Copyright Year	2011
Abstract	The alluvial aquifer of the Lower Magra Basin (La Spezia Province, Italy) is mainly recharged by two main rivers of the region, Magra and Vara, with a subordinate contribution from rain waters infiltrating in the eastern horst adjacent to the graben of the Lower Magra River. This conceptual model is consistent with the constraints provided by both piezometric maps and chemical and isotopic data of local groundwaters and fluvial waters. Chemical data also suggest that, in the considered system, Cl and SO$_{4}$ have mobile (conservative) behaviour, and Na, K, and Sr have close-to-mobile behaviour; in other words, the contents of these chemical components are essentially fixed by mixing relationships between Magra and Vara river waters. In contrast, Mg, Ca, Ba, HCO$_{3}$, and SiO$_{2}$ are largely contributed by water–rock interaction. Unexpectedly, Li has non-mobile behavior owing to either incorporation into secondary minerals or sorption onto solid phases or both. The discovery of two natural sources, one of Cl and the other of SO$_{4}$, in the basin of the Aullella Creek, a tributary of the Upper Magra River, made possible a key understanding of groundwater dynamics. Every year, during the summer, a mass of Cl and SO$_{4}$-rich waters originating from the Aullella Creek enters the alluvial aquifer of the Lower Magra Basin. Average groundwater velocity and average permeability, representative of the entire alluvial aquifer of interest, were derived based on the movement of this high-salinity water mass.
Starting Page	235
Ending Page	254
Page Count	20
File Format	PDF
ISSN	08912556
Journal	Carbonates and Evaporites
Volume Number	26
Issue Number	3
e-ISSN	18785212
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-09-06
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater Thermo-mineral water Alluvial aquifer Magra River Vara River Mineralogy Geology Mineral Resources
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

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