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Visual dating of scars based on their appearance on the stem surface
Presented by Mr. Daniel TRAPPMANN on 17 May 2013 from 14:50 to 15:10
Type: Oral Presentation
Gravitational processes frequently threaten settlements and transportation corridors in mountain environments. On forested slopes, injuries in trees form an archive of past events which has been used extensively for hazard and risk assessment in the past. However, dendrogeomorphic dating of events often represents a time-consuming and expensive approach, and is not therefore widely used in practical applications. Here we present a dating approach for scars inflicted to Larix decidua Mill. which solely considers their external appearance. The dating tool is based on age-dependant characteristics of rockfall scars, such as the appearance of resin or the color of the overgrowing tissue. Extensive tests on a rockfall slope in the Swiss Alps demonstrate quite clearly that differences in reconstructed spatio-temporal patterns of rockfall activity are negligible between visual dating and dendrogeomorphic approaches, and therefore point to the potential of this new and efficient tool.