indicators selected for: forest area coarse scale fine scale hazard potential damage potential
DESCRIPTION
Development of Harmonised Indicators and Estimation Procedures for Forests with Protective Functions against Natural Hazards in the Alpine Space Harmonised indicators. Indicators selected for: Forest area Coarse scale Fine scale Hazard Potential Damage Potential Protective effect - PowerPoint PPT PresentationTRANSCRIPT
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
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Hazard potential:
– Coarse and fine scale- Avalanche
- Slope 28° – 55°- Planar curvature -2 – 0.2- Minimum forested area 5000m²
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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°
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Hazard potential:
– Coarse and fine scale Rockfall- Slope
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Damage potential:
– Coarse and fine scale- Data availability?
- Buffer zone 25m
Final Meeting
Protective effect:
– Avalanche- Coarse scale
- Total crown cover- Coniferous crown cover
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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