LiDAR DEMを用いた表層崩壊のアセスメントに適する勾配と凹凸度の計算範囲の推定

概要

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The most suitable window size for the assessment of shallow landslides caused by heavy rainfalls was estimated using 2m resolution LiDAR DEM. The study area lies in the mountains of Tertiary sedimentary rocks distributed from Izumozaki town to Nagaoka city of Niigata Prefecture. Linear discriminant analysis was done in order to determine the most suitable window size for 2m grid landslide data. Explaining variables were the slope gradient and convexo-concave index calculated by variable sized kernels (from 3×3 to 47×47). As the results, the most suitable window size for the study area is around 30m, and the most suitable window size is essentially proportional to the mean size of target landslides. Moreover, to obtain the most effective window, it is ascertained that the expansion of kernel size is better than the resolution-reduction of DEM.
2009-01-25