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The Montellina Spring as an Example of Water Circulation in an Alpine DSGSD Context (NW Italy)

1
Earth Sciences Department, Turin University, via Valperga Caluso 35, 10125 Torino, Italy
2
Dipartimento di Ingegneria dell’Ambiente, del Territorio e delle Infrastrutture—DIATI, Politecnico di Torino, 10125 Torino, Italy
*
Author to whom correspondence should be addressed.
Water 2019, 11(4), 700; https://doi.org/10.3390/w11040700
Received: 7 February 2019 / Revised: 26 March 2019 / Accepted: 2 April 2019 / Published: 4 April 2019
(This article belongs to the Section Hydrology)
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Abstract

Alpine areas, with normally fissured bedrock outcrops, do not typically contain important hydrologic reservoirs, except for small aquifers located in Quaternary sediments. By contrast, mountainous areas affected by deep-seated gravitational slope deformations (DSGSD), especially if covered by glacial sediments, contain large aquifers and are consequently promising for water exploitation. This last geological setting is observed, for example, in the lower Dora Baltea Valley (near the confluence with the Renanchio Basin) in which the Montellina Spring is located and exhibits a very high discharge. A multidisciplinary approach (detailed geological survey of the bedrock and Quaternary cover, as well as hydrogeological research based on tracer tests, hydrochemical analyses, and water balance studies) was used, allowing for a reconstruction of the geological and hydrogeological setting of the investigated area, also considering its environmental implications. The consequent hydrogeological model derives from the coexistence of some factors. In detail, the thick glacial cover, widespread in the intermediate sector of the slope, represents an important aquifer with a slow groundwater flow to the spring. The buried glacial valley floor, hosting this cover, can convey the groundwater from the high Renanchio Basin zone towards the low sector. The loosened bedrock of the low sector, consequent to DSGSD phenomena, favors the concentration of groundwater along the contact with the underlying normal fissured bedrock outcropping at the base of the slope. Finally, the flow until the spring essentially takes place through N100° trend open fractures and trenches. Part of the Montellina Spring discharge is also fed by the low Renanchio Stream, as highlighted by fluorescein tests, essentially using NE-SW oriented open fractures on the bedrock. The results of the investigation on the Montellina Spring can provide some insight regarding the hydrological potential of other alpine areas with a similar geological setting. View Full-Text
Keywords: alpine spring; hydrogeological survey; DSGSD; glacial sediments; Western Alps; tracer tests alpine spring; hydrogeological survey; DSGSD; glacial sediments; Western Alps; tracer tests
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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De Luca, D.A.; Cerino Abdin, E.; Forno, M.G.; Gattiglio, M.; Gianotti, F.; Lasagna, M. The Montellina Spring as an Example of Water Circulation in an Alpine DSGSD Context (NW Italy). Water 2019, 11, 700.

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