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Article

Karst Recharge Areas Identified by Combined Application of Isotopes and Hydrogeological Budget

Department of Civil, Constructional and Environmental Engineering (DICEA), Sapienza University of Rome, 00184 Rome, Italy
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Author to whom correspondence should be addressed.
Academic Editor: Juraj Parajka
Water 2021, 13(14), 1965; https://doi.org/10.3390/w13141965
Received: 19 May 2021 / Revised: 12 July 2021 / Accepted: 13 July 2021 / Published: 17 July 2021
(This article belongs to the Special Issue Isotope Hydrology)
The identification of recharge areas in karst aquifers allows us to perform sustainable management of these groundwater resources. Stable isotopes (δ18O and δ2H) have been largely used to provide information about recharge elevation in many mountainous regions. In this paper, an improved version of a recent “isotope-driven model”, for the identification of recharge areas, was applied to Capodacqua di Spigno Spring (south of the Latium region). The model upgrade consists of a preliminary check procedure to estimate the degree of influence of the rainfall’s isotopic variability on the spring water. This additional procedure gives us an indication of the reliability of the model and its applicability conditions. Moreover, the dataset of the spring was updated to analyze the degree of reliability of the isotope-driven model. The purpose of this study was to combine the previously mentioned isotope-driven model with hydrogeological tools. A quantitative study of the basin, based on the estimation of the average monthly infiltration volume, was performed by using the inverse hydrogeological water budget. In this way, the qualitative model for the recharge areas’ estimation was validated by a quantitative hydrogeological tool. Both models show that, for karst mountain basins, the recharge areas decrease as the average recharge elevations increase, including areas at high altitudes. View Full-Text
Keywords: recharge area; karst aquifer; stable isotope; inverse hydrogeological water budget; isotopic tracers; spring discharge; rainfall isotopic variability recharge area; karst aquifer; stable isotope; inverse hydrogeological water budget; isotopic tracers; spring discharge; rainfall isotopic variability
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MDPI and ACS Style

Iacurto, S.; Grelle, G.; De Filippi, F.M.; Sappa, G. Karst Recharge Areas Identified by Combined Application of Isotopes and Hydrogeological Budget. Water 2021, 13, 1965. https://doi.org/10.3390/w13141965

AMA Style

Iacurto S, Grelle G, De Filippi FM, Sappa G. Karst Recharge Areas Identified by Combined Application of Isotopes and Hydrogeological Budget. Water. 2021; 13(14):1965. https://doi.org/10.3390/w13141965

Chicago/Turabian Style

Iacurto, Silvia, Gerardo Grelle, Francesco M. De Filippi, and Giuseppe Sappa. 2021. "Karst Recharge Areas Identified by Combined Application of Isotopes and Hydrogeological Budget" Water 13, no. 14: 1965. https://doi.org/10.3390/w13141965

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