Mapping of the protective function of forests in Austria against shallow landslides

240-248

Artikel aus einem Buch

200209180

Keywords: object-protection forest; shallow landslides; susceptibility modelling; runout-modelling; damage potential
We performed the first approach of shallow landslide hazard and damage potential modelling throughout Austria in order to map object-protection forests. Landslide susceptibility mapping was done regionally by frequency ratio method (FRM) and binary logistic regression (BLR) based on two landslide inventories compiled from random archive data and area plot sampling. As predictions from regional models cannot be compared directly, we tested two approaches of trans-regional adjustment. In total, adjusted results show similar prediction-rates with a slightly lower performance of BLR. However, the two versions show quite different prediction patterns with higher plausibility of FRM. We used the travel-angle method to approximate runout of hillslope debris flows. The algorithm implies functionality to back-calculate zones from potentially affected infrastructure to locations of slope instability. The intersection of these hazard zones with forest area indicates object-protection forests against landslides.