Study on the Model for Volume Estimation of Landslides by Using 3-D Laser Scanner in WenchuanEarthquake Area

摘要

Wenchuan earthquake produced massive loosen landslides, which have become the main source of earthquake added soil erosion, to threaten the ecological system recovery and the production and livelihood security of the localities. The landslides in Wenchuan Town, Sichuan Province were measured by using 3-D laser scanner. The model of relationship between their horizontal projected areas and volumes were suggested in this study. The accuracy of the scanning was 20.0*20.0 cm at the place 200 m from the scanner. The geometry shape of landslide segmented was approximated as tetrahedron. The measurements of five typical landslides were used to calibrate a model to link landslide horizontal projected area to the volume. The model was verified by using Cyclone 6.0 software. This estimation model supplies an important basis for earthquake-added soil erosion forecast and volume estimation of earthquake area landslide by using remote-sensing image.