Reconstruction and Spatial Analysis of Rockfall Frequency and Bounce Heights Derived from Tree Rings

Abstract

Geomorphic processes continuously shape mountain regions, with rockfall being one of the most widespread and frequent events. Its unpredictable and sudden occurrence poses major threats to settlements, human infrastructure and can even lead to the loss of life (Porter and Orombelli 1981; Bunce et al. 1997; Guzzetti 2000). In recent years, anthropogenic activities increasingly expanded into marginal regions. This development results in the construction of new infrastructure and settlements in exposed areas, leading to increased risk of casualties. In order to avoid future accidents, an accurate hazard assessment and risk analysis become more and more inevitable. Besides a comprehensive understanding of the process, risk evaluation requires the knowledge of past rockfall activity in space and time. Areas where rockfall occurs have to be identified, and the frequency and magnitude of events determined. As a result, rockfall has become one of the most intensely studied geomorphic processes in the alpine environment.