Slope characteristics
Mean gradient of the slope
º
Estimated depth of the slide plane
1
0.5
1.0
1.5
2.0
m
Effective friction angle of the soil
º
Effective soil cohesion
kPa
Safety Factor (SF)
1.25
1.0
1.25
1.5
-
Forest characteristics
Mean stand density
/ha
Mean diameter at breast height (DBH)
cm
Occurrence of dominant tree species:
- Norway spruce (
Picea abies
)
%
- Silver fir (
Abies alba
)
%
- European beech (
Fagus sylvatica
)
%
- Other broadleaved species
%
- Other coniferous species
%
1. Overall landslide probability:
- Without forest: %
- With the above-defined forest: %
2. Current degree of protection:
??? - ??? %
Data used for the calculation:
- Safety Factor (SF) of slopes at the point of failure (critical) = 1.25
- Lateral reinforcement by tree roots = kN/m
- Average basal reinforcement by tree roots = kPa
- Weight of the forest vegetation = t/m (on average ±0 cm of soil)