Event-based rapid landslide mapping including estimation of potential human impacts on landslide occurrence: a case study in Lower Austria

Karin Gokesch, Thomas Glade and Joachim Schweigl

Within any landslide susceptibility, hazard and risk assessment, landslide inventories play a crucial part determining the quality of further analyses. The applied methodology describes a fast way of assessing landslides related to a heavy rainfall event in Lower Austria in May 2014. Based on reported damages and aerial photographs a first inventory was created. Information on the location, extent and human activities potentially influencing landslide occurrence were assessed. The resulting event-based landslide inventory showed that a quick landslide mapping can provide an overview of affected areas following a rainfall event. The extent of the landslides was assessed allowing a better estimation of potential hazards accompanying heavy precipitation in the study area. Analyzing the potential human impact on landslide occurrence showed that numerous indirect and direct influences, such as slope undercutting, forest roads or drainage, can serve as preparatory and predisposing factors for landslide occurrence. Although the direct human impact on landslide-triggering could not be determined, landslide mapping immediately after the event provided detailed documentation of human influences on landslide occurrence.

2016/1 513-524