Rockfall Investigation around the Yingxiu Hydropower Station using Airborne and Ground Remote Sensing Technologies, in Sichuan Province, Southwest China

Rockfall is generally developed in high and steep mountain area, which is difficult to identify by ground surveys. In this study, a method combining UAV photogrammetry, UAV LiDAR and ground-based LiDAR technology is proposed for 3D data collection in the high vegetation coverage canyon areas, which is comprehensively applied to rockfall investigation and evaluation in the area around Yingxiu Hydropower Station. 7 potential rockfalls were identified in the study area. The remote controlling and large range data acquisition of the airborne LiDAR are combined with the high-precision, multi measuring station, multi angle and other characteristics of the ground-based LiDAR to obtain the real condition of the slope surface in the study area, which is conducive to rockfall identification.