Benefits of protection forests

Forests for natural hazard risk
reduction: economic benefits and
challenges
Luuk Dorren
Principle of natural hazard risk prevention
1. Avoiding / evading (hazard maps)
2. Biological measures (protection forests)
3. Technical measures (protective constructions)
4. Organisational measures
(monitoring, evacuation/closure,
temporal object protection, …)
Benefits of protection forests
1.
Forests simultaneously mitigate multiple
natural hazards
2.
Forests have a higher life expectancy and are
cheaper than technical protective measures
– they reduce maintenance costs of existing
technical measures
3.
Forests provide additional functions such as
biodiversity, water filtering, wood
production, recreation / tourism, etc.
Key figures on protection forests in CH
• Yearly investment ~ 145 Million € (40% by the Confederation)
• Total area: ~ 585‘000 ha (50% of forest area CH)
50 km
Valuating protection forests
1. Avalanche risk reduction Switzerland: 75 Million € / year (~ 100‘000 ha)
2. Rockfall risk reduction: 45’000 € / year (50 ha study area)
3. Protection value ≥ wood production value (~ 500 € / ha * year)
4. Steel avalanche barriers 950‘000 € / ha; wooden avalanche barriers 330‘000 €
/ ha; forest management ~ 20‘000 € / ha
Accounting for infrastructure closure
Challenges
•
Quantifying the effect of forests against shallow landslides,
debris flows and floods
•
Better methods for calculating risk reduction due to the
protective effect of forests
•
Prevention of negative effects of forests during extreme events
More information
[email protected]
Bern University of Applied Sciences
Tel. +41 31 910 2978
Int. association for natural hazard risk management
w w w . e c o r i s q . o r gg