Change Detection and Feature Extraction of Debris-Flow Initiation by Rock-Slope Failure Using Point Cloud Processing

Figure 7

The change detection of debris-flow area. (a) The changes in the detection in 1# debris flow from 2007 to 2011. It showed strong erosion in debris-flow chute which ranged from 1.2 m to 1.5 m. A relatively small positive change ranging from 0.3 m to 0.6 m occurred outside the debris flow, representing the deposition on the slope due to the weathering and small pieces of rocks that fell down from the steep initiation points. (b) The changes in the detection in 1# debris flow from 2011 to 2015. It showed inconspicuous change during these 4 years which shows that the debris flow tends to be stable.

(a)

(b)