期刊
LANDSLIDES
卷 14, 期 5, 页码 1579-1592出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s10346-017-0801-3
关键词
Terrestrial laser scanning; LiDAR; Rockfall hazard; Rockfall frequency-magnitude; Change detection
资金
- BGC Engineering Inc. through Natural Sciences and Engineering Research Council of Canada
- Canadian Railway Ground Hazard Research Program (CN Rail)
- Canadian Railway Ground Hazard Research Program (CP Rail)
- Canadian Railway Ground Hazard Research Program (Transport Canada)
- Canadian Railway Ground Hazard Research Program (Geological Survey of Canada)
Using change detection and semi-automated identification methods, it is possible to extract detailed rockfall information from terrestrial laser scanning data to build a database of events, which can be used in the development of the frequency-magnitude relationship for a slope. In this study, we have applied these methods to the White Canyon, a hazardous slope that presents rockfall hazards to the CN Rail line in British Columbia, to build a database of rockfalls including their locations, volumes, and block shapes. We identified over 1900 rockfall events during a 15-month period, ranging in volume from 0.01 to 45 m(3). The frequency of these events changed throughout the year, with the highest periods of activity occurring over the winter months. We investigated how the sampling interval, or duration between scans, can affect how the rockfalls are identified, and therefore the frequency-magnitude relationship for the slope using datasets with fewer scans. We show that as the duration between scans becomes larger, fewer rockfalls are detected, as multiple events that have occurred in the same location cluster together into a single event. The results of this study can be used to assist the railways in planning the appropriate number and duration between future scans, in order to capture frequency-magnitude data for the slope with a desired level of detail.
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