Item: Wind transport scenarios based on the slope aspect for avalanche risk management purposes
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Title: Wind transport scenarios based on the slope aspect for avalanche risk management purposes
Proceedings: International Snow Science Workshop Proceedings 2018, Innsbruck, Austria
Authors:
- Eloïse Bovet [ Fondazione Montagna sicura, Courmayeur (AO), Italy ]
- Luca Pitet [ Assetto Idrogeologico dei Bacini Montani, Regione Autonoma Valle d’Aosta, Italy ]
- Igor Torlai [ Centro Funzionale, Regione Autonoma Valle d’Aosta, Italy ]
- Valerio Segor [ Assetto Idrogeologico dei Bacini Montani, Regione Autonoma Valle d’Aosta, Italy ]
- Paola Dellavedova [ Fondazione Montagna sicura, Courmayeur (AO), Italy ]
- Umberto Pellegrini [ Centro Funzionale, Regione Autonoma Valle d’Aosta, Italy ]
Date: 2018-10-07
Abstract: Avalanche risk management assumes an in-depth knowledge of the nivometeorological situation to which tools for the definition of avalanche potential release can be associated. The application of the PRA tool, developed by the SLF, on 600 real cases in Aosta Valley showed the important role played by the wind direction in determining scenarios of avalanche detachment. On those basis a rapid method has been developed, using the 10m wind intensity and direction data provided by the Cosmoi2 predictive model. The wind direction input was calculated by averaging vectorially the wind directions over the 24h, weighted with the cube of the intensity. In order to validate this procedure, the data elaborated with our procedure were compared with 1) the data of 52 automatic stations and 2) the observations contained in the Models 1 A.I.NE.VA. Scenarios of possible snow eroded / loaded areas are realized according to the wind direction at both valley and single-basin scales. Daily, after 40 minutes calculation time, three graphs are forecast: 1) statistical summary of the basins eroded / loaded by the wind on the 26 micro-areas in which the Aosta Valley is divided, 2) wind direction on the 800 cells of the Cosmoi2, 3) probability of erosion / deposit on each individual avalanche basin. Those graphs are displayed in the Avalanche Local Committees (CLV) web platform. The procedure, while giving satisfactory results, has limits due to the simplicity of the model used, to scale issues and to the snowdrift amount neglected in the modelisation.
Object ID: ISSW2018_O02.1.pdf
Language of Article: English
Presenter(s):
Keywords: snow-drift, forecast, avalanche risk management, avalanche scenario.
Page Number(s): 106-110
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