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Snow gliding and loading under two different forest stands: a case study in the north-western Italian Alps

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Abstract

The presence of a thick snowpack could interfere with forest stability, especially on steep slopes with potential damages for young and old stands. The study of snow gliding in forests is rather complex because this phenomenon could be influenced not only by forest features, but also by snow/soil interface characteristics, site morphology, meteorological conditions and snow physical properties. Our starting hypothesis is that different forest stands have an influence on the snowpack evolution and on the temperature and moisture at the snow/soil interface, which subsequently could affect snow gliding processes and snow forces. The aim of this work is therefore to analyse the snowpack evolution and snow gliding movements under different forest covers, in order to determine the snow forces acting on single trees. The study site is located in a subalpine forest in Aosta Valley (NW-Italy) and includes two plots at the same altitude, inclination and aspect but with different tree composition: Larch (Larix decidua) and Spruce (Picea abies). The plots were equipped with moisture and temperature sensors placed at the snow/soil interface and glide shoes for continuous monitoring of snow gliding. The recorded data were related to periodically monitored snowpack and snow/soil interface properties. Data were collected during two winter seasons (2009–10 and 2010–11). The snow forces on trees were analytically calculated either from snowpack data and site morphology or also from measured snow gliding rates. Different snow accumulations were observed under the two different forest stands, with a significant effect on temperature and moisture at the snow/soil interface. The highest snow gliding rates were observed under Larch and were related to rapid increases in moisture at the snow/soil interface. The calculated snow forces were generally lower than the threshold values reported for tree uprooting due to snow gliding, as confirmed by the absence of tree damages in the study areas.

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Authors and Affiliations

  1. Dipartimento di Scienze Agrarie Forestali e Alimentari and NatRisk-LNSA, University of Torino, Via L. Da Vinci 44, 10095, Grugliasco (TO), Italy

    Davide Viglietti, Margherita Maggioni, Enrico Bruno, Ermanno Zanini & Michele Freppaz

Authors
  1. Davide Viglietti
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  2. Margherita Maggioni
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  3. Enrico Bruno
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  4. Ermanno Zanini
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  5. Michele Freppaz
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Correspondence to Davide Viglietti.

Additional information

Fund project: This study was supported by the Project “Forêts de protection: techniques de gestion et innovation dans les Alpes occidentals” within the Operational Program ALCOTRA Italy-France 2009–2012)”.

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Viglietti, D., Maggioni, M., Bruno, E. et al. Snow gliding and loading under two different forest stands: a case study in the north-western Italian Alps. Journal of Forestry Research 24, 633–642 (2013). https://doi.org/10.1007/s11676-013-0401-6

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  • DOI: https://doi.org/10.1007/s11676-013-0401-6

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