Final Meeting
Development of Harmonised Indicators and Estimation Procedures for Forests with
Protective Functions against Natural Hazards in the
Alpine Space
Harmonised indicators
Final Meeting
Indicators selected for:
– Forest area- Coarse scale- Fine scale
– Hazard Potential– Damage Potential– Protective effect
- Coarse scale- Fine scale
Final Meeting
Forest area:
– Coarse and fine scale- According FAO
- Minimum crown cover- Minimum area- Minimum height
Final Meeting
Forest area:
– Coarse and fine scale- According FAO
- Minimum crown cover 30%- Minimum area 5000m²- Minimum height 2m
Final Meeting
Hazard potential:
– Coarse and fine scale- Avalanche
- Snow height- Snow cover region and altitude
- Slope- Planar curvature- Minimum forest area
Final Meeting
Hazard potential: Avalanche
Alpine RegionAltitudinal zone
(hazard potential)
Code Region 1 2
Austria
A100 Vorarlberg ≥ 700 m ≥ 900 m
A210 Northern Alps – West Zone≥ 800 m ≥ 1 000
m
A220 Northern Alps – Middle Zone≥ 750 m ≥ 1 000
m
A230 Northern Alps – East Zone ≥ 700 m ≥ 900 m
A310 Western Central Alps – West Zone≥ 900 m ≥ 1 100
m
A320Western Central Alps – Middle
Zone≥ 1 250
m≥ 1 700
m
A330 Western Central Alps – East Zone≥ 900 m ≥ 1 400
m
A400 Eastern Central Alps≥ 800 m ≥ 1 000
m
Final Meeting
Hazard potential:
– Coarse and fine scale- Avalanche
- Slope 28° – 55°- Planar curvature -2 – 0.2- Minimum forested area 5000m²
Final Meeting
Climaticavalanche
hazard potential
Slope gradient
- 28° >28 – 34° >34 – 39° >39 – 55° > 55°
Avalanche hazard potential of slope gradient
0 1 2 3 0
Avalanche hazard potential (AHP)
0 0 0 0 0 0
1 0 0 1 1 0
2 0 2 3 3 0
Hazard potential:
– Coarse and fine scale - Avalanche
Final Meeting
Hazard potential:
– Coarse scale- Rockfall
- Slope- Outside the forest mask and inside the
rock mask a slope threshold of 43°- Inside the forest mask a slope threshold
of 39°
Final Meeting
Hazard potential:
– Coarse and fine scale Rockfall- Slope
Final Meeting
Damage potential:
– Coarse and fine scale- Data availability?
- Buffer zone 25m
Final Meeting
Protective effect:
– Avalanche- Coarse scale
- Total crown cover- Coniferous crown cover
Final Meeting
Protective effect:
– Avalanche- Coarse scale
- Total crown cover- Coniferous crown cover
Final Meeting
Protective effect:
– Avalanche- Fine scale
- Total crown cover- Coniferous crown cover- Tree height - Gap length
Final Meeting
Protective effect:
– Avalanche- Fine scale
- Total crown cover- Coniferous crown cover- Tree height (AHP 1: -2m, AHP 2/3: 5m)
Final Meeting
Protective effect:
– Avalanche- Fine scale
- Gap length
Slope (°) Critical gap length (m)
30 60
35 50
40 40
45 30
Final Meeting
Protective effect:
– Rockfall- Coarse scale
- Forested slope length- Basal area
Final Meeting
Protective effect:
– Rockfall- Coarse scale
- Forested slope length (>200m)- Basal area
Basal area Level of protective effect of forest
≥ 25 m2/ha 1 – high
15 – 25 m2/ha 2 – medium
< 15 m2/ha 3 – low
Final Meeting
Protective effect:
– Rockfall- Fine scale
- Forested slope length- Fraction of gaps- Stem density- DBH - (Stone size)
Final Meeting
Protective effect:
– Rockfall- Fine scale
- Forested slope length ( > 200m %)- Fraction of gaps (gap < 25%)
Final Meeting
Protective effect:
– Rockfall- Fine scale
- Stem density- DBH
Stone size Trees/ha DBH Trees/ha DBH Trees/ha DBH
Small >600 >12 cm >400 >12 cm ≤400 ≤12 cm
Medium >400 >24 cm >300 >24 cm ≤300 ≤24 cm
Large >200 >36 cm >150 >36 cm ≤150 ≤36 cm
Protective effect 1 - high 2 - medium 3 - low
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