Surface change modelling of small scale debris flow dynamics (Mühlsturzgraben, Berchtesgaden National Park, Germany)
Margherita Stumvoll, University of Salzburg (AT)
The small (0.5 km²) but steep Mühlsturzgraben catchment in the National Park Berchtesgaden (∆h = 1250 m) experiences frequent high-runoff events with the activity of debris flows due to the lithologic setting and location-specific high rainfall intensities. It is part of the Klausbach valley, a popular tourist destination. The investigation of recent sediment dynamics in the catchment is based on high-resolution topographic change modelling using multi-temporal terrestrial and airborne laserscanning data (2009-2016). Results are interpreted with respect to external triggering factors (e.g. rainfall intensity thresholds) and internal system dynamics (e.g. sediment availability).