Item: Back-Calculations of Observed Avalanches Against Natural Deflecting Dams
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Title: Back-Calculations of Observed Avalanches Against Natural Deflecting Dams
Proceedings: Proceedings, 2012 International Snow Science Workshop, Anchorage, Alaska
Authors:
- Dieter Issler [ Norwegian Geotechnical Institute, P.O. Box 3930 Ullev ÌŠ al Stadion, 0806 Oslo, Norway ]
- Carl B. Harbitz [ Norwegian Geotechnical Institute, P.O. Box 3930 Ullev ÌŠ al Stadion, 0806 Oslo, Norway ]
- Ulrik Domaas [ Norwegian Geotechnical Institute, P.O. Box 3930 Ullev ÌŠ al Stadion, 0806 Oslo, Norway ]
- Kalle Kronholm [ Norwegian Geotechnical Institute, P.O. Box 3930 Ullev ÌŠ al Stadion, 0806 Oslo, Norway ]
- Marc Christen [ WSL Institute for Snow and Avalanche Research SLF, 7260 Davos Dorf, Switzerland ]
Date: 2012
Abstract: The objective of this study is to assess the reliability of presently available numerical avalanche models in predicting avalanche flow about deflecting natural terrain features such as large boulders or moraine ridges. Field observations from Norway have been back-calculated using RAMMS. The observations vary in quality, but the main features of the avalanches regarding release, track and runout have been documented. The quality of the available digital elevation model is critical for the model results. For the two smallest avalanches, good agreement between simulation and observation of both run-up height and runout distance required substantially higher values than commonly used for the friction parameters and . This has the effect of increasing the velocity in the track and shortening the stopping distance.
Object ID: issw-2012-038-045.pdf
Language of Article: English
Presenter(s): unknown
Keywords: dynamic model, avalanche hazard, calculations, ramm-sonde,
Page Number(s): 38-45
Subjects: snow avalanche dynamics simple calculations
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