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  • 1
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    Using GIS for modelling the impact of current climate trend on the recharge area of the S. Susanna spring (central Apennines, Italy) (2010)
    Wiley
    Details
    Publication Date: 2010-01-01
    Description: Though the S. Susanna spring system is one of the biggest water sources in the central Apennines, its hydrogeological dynamics have been scarcely investigated. This study tried to clarify some of the factors controlling the recharge/discharge processes of this spring by modelling the available climate series, water balance equations and new isotopic and quantitative data, using statistical and raster overlay functions embedded in a Geographic Information System (GIS). Oxygen and hydrogen isotopic data were recorded monthly over a 2-year period at the spring itself and in eight rain gauges in Reatini Mountains. The effective infiltration rate was calculated using the Kennessey coefficients and the Turc equation. Finally, the recharge area was identified with the help of an expert evaluation procedure. Local δ18O and δD versus altitude regression curves were used to validate the digital recharge model by comparing their expected values with the values actually measured. Recharge process was framed within the perspective of the ongoing local climate trends. The current discharge rate of 4·1 m3·s-1. is significantly lower than the average value of 5·5 m3·s-1. measured up to the 1980s, confirming the fall in the recharge/discharge rate. The hydrogeological system shows a delayed response, due to an average groundwater residence time in the aquifer, which is estimated to be about 15/20 years on the basis of the offset between calculated and observed isotope data at the main spring. For this reason the system is presently not equilibrated and is gradually changing towards a final equilibrium discharge estimated in about 3·4m3·s-1. © 2009 John Wiley & Sons, Ltd.
    Print ISSN: 0885-6087
    Electronic ISSN: 1099-1085
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Wiley
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  • 2
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    Innovative Uses of Rain Screen Cladding. CFD and Gas Dispersion Analysis of a Prototype (2015)
    Elsevier
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    Publication Date: 2015-12-01
    Electronic ISSN: 1876-6102
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Elsevier
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  • 3
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    Determining the origin of carbon dioxide and methane in the gaseous emissions of the San Vittorino plain (Central Italy) by means of stable isotopes and noble gas analysis (2015)
    Elsevier Science Limited
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    Publication Date: 2021-06-09
    Description: The chemistry and isotope ratios of He, C (d13C) and H (dD) of free gases collected in the San Vittorino plain, an intramontane depression of tectonic origin, were determined to shed light on mantle degassing in central Italy. The C isotopic composition of CO2 (d13C–CO2 2.0‰to 3.8‰) and He isotope ratios (R/RA 0.12–0.27) were used to calculate the fraction of CO2 originating from mantle degassing vs. sedimentary sources. The results show that CO2 predominantly (average of 75%) derives from the thermo-metamorphic reaction of limestone. Between 6% and 22% of the CO2 in the samples derives from organic-rich sedimentary sources. The mantle source accounts for 0–6% of the total CO2; however, in two samples, located in proximity to the most important faults of the plain, the mantle accounts for 24% and 42%. The presence of faults and fractures allows upward gas migration from a deep source to the Earth’s surface, not only in the peri-Tyrrhenian sector, as generally reported by studies on natural gas emissions in central Italy, but also in the pre-Apennine and Apennine belts. Isotope ratios of CH4 (d13C–CH4 6.1‰ to 22.7‰; dD–CH4 9‰ to 129‰) show that CH4 does not appear to be related to mantle or magma degassing, but it is the product of thermal degradation of organic matter (i.e. thermogenic origin) and/or the reduction of CO2 (i.e. geothermal origin). Most of the samples appear to be affected by secondary microbial oxidation processes.
    Description: Published
    Description: 90.101
    Description: 6A. Monitoraggio ambientale, sicurezza e territorio
    Description: JCR Journal
    Description: restricted
    Keywords: stable isotope ; noble gases ; carbon dioxide ; methane ; San Vittorino Plain ; 04. Solid Earth::04.02. Exploration geophysics::04.02.01. Geochemical exploration
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
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    Determining the origin of carbon dioxide and methane in the gaseous emissions of the San Vittorino plain (central Italy) (2012)
    Details
    Publication Date: 2017-04-03
    Description: We are presenting here both chemistry and isotope ratios of helium (He), carbon (13C) and hydrogen (D) of free gases collected in the San Vittorino plain, an intramontane depression of tectonic origin, in order to provide new constraints to better understand mantle degassing in central Italy. Carbon isotopic composition of the carbon dioxide (δ13C-CO2 -2.0‰ to -3.8‰) and He isotope ratios (R/RA 0.12 to 0.27) are used to calculate the fraction of CO2 originating from mantle degassing versus sedimentary sources. Results show that CO2 predominantly (average of 80%) derives from thermo-metamorphic reaction of limestone. The remaining 20% are attributed to a mantle source. The presence of tectonic dislocations allows upward gas migration from a deep source to the Earth’s surface, not only in the peri-Tyrrhenian sector, but also in the more eastern part of central Italy. Isotope ratios of methane (13C-CH4 -6.1‰ to -22.7‰; D-CH4 -9‰ to -129‰) shows that the gas vent releases gas of thermogenic origin, involving CO2 and/or organic matter. Methane seems not to be related to mantle or magma degassing, but seems to be affected by microbial oxidation process.
    Description: Submitted
    Description: 4.5. Studi sul degassamento naturale e sui gas petroliferi
    Description: JCR Journal
    Description: reserved
    Keywords: Carbon dioxide, helium, methane, isotopes, mantle degassing, methanotrophic oxidation ; 04. Solid Earth::04.02. Exploration geophysics::04.02.01. Geochemical exploration
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: manuscript
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