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Detection of Old Diffusive Windthrow Using Low Cost Resources. the Case of Xynthia Storm in the Vosges Mountains, 28 February 2010

I. Haidu,Paula Furtună,S. Lebaut

Published 2017 in Unknown venue

ABSTRACT

Unlike the contiguous windthrows, the diffuse windthrows occurred as a result of wind 12 gusts of lower speed (100-140 km/h) than in the first case (>140 km/h) are much more difficult to 13 detect due to their much lower areas and due to their very large number, of several hundreds in the 14 wooded mountain massifs. The objective of this research is to present a rapid procedure for the 15 detection of the diffuse windthrows based on low cost, Landsat type images, knowing that certain 16 sensors cannot be accessed without significant investments. Our application is based on the study 17 of effects caused by the Xynthia storm in the Vosges Mountains in the NorthEast of France, on 28 18 February 2010. Thus, based on two sets of Landsat satellite images, we used the "dark object" 19 approach and the Disturbance Index, as well as a classification of the images before and after the 20 storm, resulting in a change map. Following the detection process, 257 scattered polygons were 21 detected, totalling 229 ha. For validation purposes, high-resolution images and orthophotoplans 22 taken before and after storm were used. The error matrix was calculated, achieving an overall 23 accuracy of 86%, which confirms the quality of our analysis and supports this procedure for 24 detecting diffuse windthrow based on low cost resources. 25

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