Quantifying the protective capacity of forests against snow avalanches
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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.

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Quantifying the Protective Capacity of Forests against Snow Avalanches

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Quantifying the protective capacity of forests against snow avalanches

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


Quantifying the protective capacity of forests against snow avalanches

  • Mountain forests of the Alps – an overview

Dischma 1927

Dischma 2005

Protection forests cover large areas (c. 25% of all forests in CH)

Qualtiy of protection is spatially and temporally variable

IDRC 2008 Davos, August 2008


Quantifying the protective capacity of forests against snow avalanches

  • Mountain forests of the Alps – an overview

IDRC 2008 Davos, August 2008


Quantifying the protective capacity of forests against snow avalanches

  • Mountain forests of the Alps – an overview

Blowdown

Bark beetle

Fire

Avalanches

Disturbances may change protective

effect drastically

Management of mountain forests –

between cost-efficiency and maximal

risk reduction

IDRC 2008 Davos, August 2008


Mountain forests of the alps other ecosystem services

Mountain forests of the Alps – other ecosystem services


Quantifying the protective capacity of forests against snow avalanches

  • How to quantify the protective capacity of forests against

  • snow avalanches?

Avalanche starting zones

Surface roughness

Forest

Conference Center Davos

Avalanche Modeling with AVAL 2D / RAMMS

Quelle: Gruber, Christen and Bartelt, SLF / WSL

IDRC 2008 Davos, August 2008


Quantifying the protective capacity of forests against snow avalanches

  • How to quantify the protective capacity of forests against

  • snow avalanches?

RAMMS: Rapid Mass Movements

A modeling system for natural hazard research and practice

Source: Gruber, Christen and Bartelt, SLF / WSL

impact pressure (kPa)

Animated flow height (m)

max velocity (m/s)

IDRC 2008 Davos, August 2008


Quantifying the protective capacity of forests against snow avalanches

  • How to quantify the protective capacity of forests against

  • snow avalanches?

Avalanche modeling for different forest scenarios

Evaluation of the protective capacity of different forests.

Situation with forest

Situation without forest

red zone: impact pressure > 30 kPa; blue zone: impact pressure < 30 kPa

IDRC 2008 Davos, August 2008


Quantifying the protective capacity of forests against snow avalanches

Risk = damage potential * recurrence probability

Object map

x

Hazard map

Object map xHazard map

Andermatt (Switzerland)

Source: M. Teich (SLF / WSL)

IDRC 2008 Davos, August 2008


Quantifying the protective capacity of forests against snow avalanches

Valuation of ecosystem goods and services

Combination of risk-assessment

with the valuation of other

ecosystem services.

Integration of uncertainties

(Bayes Networks)

Source: Gret-Regamey 2007

IDRC 2008 Davos, August 2008


Quantifying the protective capacity of forests against snow avalanches

Conclusions

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.

IDRC 2008 Davos, August 2008


Thank you for your attention

Thank you for your attention!

Peter Bebi and Perry Bartelt WSL / SLF Davos

email: [email protected], [email protected]

IDRC 2008 Davos, August 2008


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