Hazard assessment due to falling stones on a reach of the regional road in the Trenta valley, Slovenia

Abstract

In the framework of the new Slovenian methodology for determining hazard areas and the classification of land parcels into hazard classes due to land slides and rock falls, a pilot project was carried out on the regional road between Bovec and Vršič pass in the Trenta valley. For this around 20 km long road in a typical alpine environment, a hazard assessment of falling rocks was carried out, even tough the road also passes through snow avalanches hazard areas. The performed hazard assessment of falling rocks is based on an expert knowledge taking into account the field mapping, and classifies the road into three hazard classes: 9811 m is classified into the low hazard class, 7233 m is classified into the medium hazard class, and 1301 m is classified into high hazard class of falling rocks.