Abstract
The resistograph device measures the drill resistance of a fine needle as it penetrates wood. It wa investigated for rapid assessment of relative wood density of particular tree-rings used in dendrogeomorphology. Ring width and resistographic measurements were performed on 15 disc stems (cross sections) of Larix decidua from an avalanche talus. 11 stems showed visible signs of past avalanches impacts ; 4, no obvious avalanche damage. Resistographic profiles were processed to determine width and density parameters of 613 tree rings. The data set, simplified using a Principal Component Analysis, highlights the abnormal density of reaction wood, compression wood and overgrowing callous tissue. The simplified assessment grid coming from PCA provides pro¬ bability benchmarks to identify disturbances in a densitometric signal. The combined use of grid and resistograph offer prospects for spatialization and cartography of avalanches hazards.
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