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Quantifying the Protective Capacity of Forests against Snow Avalanches. Peter Bebi and Perry Bartelt Swiss Federal Institute for Snow and Avalanche Research, SLF Davos. IDRC 2008 Davos, August 2008. Mountain forests of the Alps – an overview. Dischma 1927. Dischma 2005. - PowerPoint PPT Presentation
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Quantifying the Protective Capacity of Forests against Snow Avalanches
IDRC 2008 Davos, August 2008
Peter Bebi and Perry BarteltSwiss Federal Institute for Snow and Avalanche Research, SLF Davos
Mountain forests of the Alps – an overview
IDRC 2008 Davos, August 2008
Protection forests cover large areas (c. 25% of all forests in CH)
Qualtiy of protection is spatially and temporally variable
Dischma 1927 Dischma 2005
Mountain forests of the Alps – an overview
IDRC 2008 Davos, August 2008
Mountain forests of the Alps – an overview
IDRC 2008 Davos, August 2008
Disturbances may change protective
effect drastically
Blowdown Bark beetle
Fire Avalanches
Management of mountain forests – between cost-efficiency and maximalrisk reduction
Mountain forests of the Alps – other ecosystem services
How to quantify the protective capacity of forests against snow avalanches?
IDRC 2008 Davos, August 2008
Avalanche Modeling with AVAL 2D / RAMMS
Quelle: Gruber, Christen and Bartelt, SLF / WSL
Avalanche starting zones
Forest
Surface roughness
Conference Center Davos
Animated flow height (m)
impact pressure (kPa)
max velocity (m/s)
RAMMS: Rapid Mass MovementsA modeling system for natural hazard research and practice
Source: Gruber, Christen and Bartelt, SLF / WSL
How to quantify the protective capacity of forests against snow avalanches?
IDRC 2008 Davos, August 2008
Situation with forest Situation without forest
Avalanche modeling for different forest scenarios
Evaluation of the protective capacity of different forests.
red zone: impact pressure > 30 kPa; blue zone: impact pressure < 30 kPa
How to quantify the protective capacity of forests against snow avalanches?
IDRC 2008 Davos, August 2008
Hazard map
Object map xHazard map
Object mapx
Source: M. Teich (SLF / WSL)
Andermatt (Switzerland)
IDRC 2008 Davos, August 2008
Risk = damage potential * recurrence probability
Valuation of ecosystem goods and services
IDRC 2008 Davos, August 2008
Source: Gret-Regamey 2007
Combination of risk-assessmentwith the valuation of other ecosystem services.
Integration of uncertainties(Bayes Networks)
IDRC 2008 Davos, August 2008
Mountain forests are (by surface area) the most important avalanche protection. Their value is spatially and temporally variable and can be calculated for each stand in a risk analyis with the help of avalanche modeling.
It would be possible to support measures for risk reduction in mountain forests more efficiently by linking them closer to their ecosystem services (and changes in space and time).
More research is needed for improved decision support in mountain forests, including the improvement of existing models, the combination of different ecosystem services and uncertainty analysis in risk-based methods.
Conclusions
Thank you for your attention!Thank you for your attention!
Peter Bebi and Perry Bartelt WSL / SLF Davosemail: [email protected], [email protected]
IDRC 2008 Davos, August 2008