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Dual-flow in karst aquifers toward a steady discharge spring (Presciano, Central Italy): influences on a subsurface groundwater dependent ecosystem and on changes related to post-earthquake hydrodynamics

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Abstract

The Presciano spring system (Central Italy) is fed by a fractured carbonate regional aquifer and shows peculiar hydrogeological, physicochemical, hydrogeochemical and biological features that led to hypothesis about local superimposition of a dual groundwater flow system. The components of this system are fast-flow and baseflow groundwater paths. Hydrogeochemical and isotopic (δ18O and δD for H2O, and δ34 \( {\text{S}}_{{{\text{SO}}_{ 4} }} \) and δ18 \( {\text{O}}_{{{\text{SO}}_{ 4} }} \)) data were used to test this conceptual model. Differences in physico-chemistry and ion concentrations were recorded for two main spring sectors, attributable to different groundwater flowpaths. Environmental isotope analyses allowed distinguishing different recharge areas for the two groups: more depleted values (−10.4 ‰ δ18O and −71 ‰ δD) indicated the existence of a flowpath influenced by a higher elevation recharge area, whereas enriched isotope signals (−9.9 ‰ δ18O and −66 ‰ δD) supported a regional recharge area of local water infiltration. The existence of a dual flow system is also reflected in the relationship between SO4 2− concentration and SO4 2− isotope data. The isotopic pattern of SO4 2− reflects the seasonal contributions by the two flow paths to the springs: after snowmelt, the isotopic sulphate value in the spring outlet is very similar to the spring sector fed by the fast flow component, while, after the spring exhaustion period, its isotopic composition is very similar to the base flow spring sectors fed by the fracture network. The influence of the different flowpaths has also been highlighted by changes in water isotope composition after the 2009 L’Aquila earthquake in this area: the strong homogeneous response of the spring system can be attributed to a cleaning of the fracture system, which affected the aquifer at regional scale. Additional investigations adopting the geoelectrical tomography technique highlighted the possibility of the existence of a buried karst channel or at least high-permeability shear zone at the contact between the carbonate aquifer and the fluvio-lacustrine quaternary deposits, where the spring system is located. Biological indicators, such as groundwater copepods also showed a response to the dual flowpath regime. The results of this study have great relevance for a better management of the Presciano spring habitat, which is increasingly threatened by anthropogenic disturbance.

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Acknowledgments

We are greatly indebted to Alessia Di Cioccio and Barbara Fiasca for having performed biological sampling and analyses in the Presciano spring system, and Maria Di Cairano, Santino Notarangelo and Daniele Gussati for field survey assistance. The Gran Sasso—Laga National Park (Italy) is acknowledged for having supported the multidisciplinary investigation. The authors thanks the anonymous reviewers for their useful comments. The research was partially granted by LIFE12 BIO/IT/000231-AQUALIFE—Development of an innovative and user-friendly indicator system for biodiversity in groundwater dependent ecosystems.

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Authors and Affiliations

  1. Dipartimento di Scienze della Terra, Università di Roma “La Sapienza”, P.le Aldo Moro 5, 00185, Rome, Italy

    Marco Petitta & Mariachiara Caschetto

  2. Department of Life, Health and Environmental Sciences, University of L’Aquila, Via Vetoio, Coppito, 67100, L’Aquila, Italy

    Diana M. P. Galassi

  3. Department of Earth and Environmental Sciences, University of Waterloo, 200 University Avenue West, Waterloo, ON, N2L 3G1, Canada

    Ramon Aravena

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  1. Marco Petitta
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Correspondence to Marco Petitta.

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Petitta, M., Caschetto, M., Galassi, D.M.P. et al. Dual-flow in karst aquifers toward a steady discharge spring (Presciano, Central Italy): influences on a subsurface groundwater dependent ecosystem and on changes related to post-earthquake hydrodynamics. Environ Earth Sci 73, 2609–2625 (2015). https://doi.org/10.1007/s12665-014-3440-1

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