Simple estimation of woody debris associated with debris flow using airborne LiDAR data and aerial photographs in Jyangunotani Valley in Kihou Town, Mie Prefecture, Japan
2018
Shimada, H. (Mie Prefecture Forestry Research Institute (Japan))
The woody debris associated with debris flow in Jangunotani Valley was estimated using a simple method that utilized airborne LiDAR data and arial photographs. Destructed forest areas of 0.88 ha were estimated by visual detection using aerial photographs taken after the occurrence of debris flow. Stand trees destroyed by debris flow in destructed forest areas were extracted by visual detection using aerial photographs taken before the occurrence of debris flow. Tree heights were estimated with a digital canopy model (DCM) generated from airborne LiDAR original data, and diameter at breast height (DBH), which was estimated from tree height using a previous regression line. Individual stem volumes calculated from tree height and DBH were summed. Thus, the amount of woody debris was 341.7 cubic m. The amount of woody debris estimated in this study was plotted within the range of relationship between the watershed area and woody debris in previous studies.
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