Mountain forests play an important role in the protection against rockfall events. Within the Interreg Alpine Space project RockTheAlps the focus is on how the protection effect can be quantified, allowing to establish a rockfall risk reduction (RRR) index for mountain forests. Based on multiple rockfall simulations on a virtual terrain, parameterized by real forest stand data, Dupire et al. (2016) presented three risk reduction indexes accounting for the protection effect of forests: To this end, only data from Austrian rock fall events exist, following the proposed procedure in order to develop specific survival curves for forest stands. Further, preliminary results need to be checked for plausibility and the idea of a normalized survival function for an arbitrary forest stand mixture along a potential rock-fall event profile must be evaluated. However, Based on the Austrian database on rockfall events, different survival curves to estimate the risk reduction probability caused by the different forest groups could be developed.
