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| Titel |
Observations and modelling of snow avalanche entrainment |
| VerfasserIn |
B. Sovilla, P. Bartelt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 2, no. 3/4 ; Nr. 2, no. 3/4, S.169-179 |
| Datensatznummer |
250000277
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| Publikation (Nr.) |
 copernicus.org/nhess-2-169-2002.pdf |
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| Zusammenfassung |
| In this paper full scale avalanche
dynamics measurements from the Italian Pizzac and Swiss Vallée de la
Sionne test sites are used to develop a snowcover entrainment model. A
detailed analysis of three avalanche events shows that snowcover
entrainment at the avalanche front appears to dominate over bed erosion at
the basal sliding surface. Furthermore, the distribution of mass within
the avalanche body is primarily a function of basal friction. We show that
the mass distribution in the avalanche changes the flow dynamics
significantly. Two different dynamical models, the Swiss Voellmy-fluid
model and the Norwegian NIS model, are used to back calculate the events.
Various entrainment methods are investigated and compared to measurements.
We demon-strate that the Norwegian NIS model is clearly better able to
simulate the events once snow entrainment has been included in the
simulations. |
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