Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p33d..06p&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #P33D-06
Other
1810 Debris Flow And Landslides, 5415 Erosion And Weathering, 5464 Remote Sensing, 5470 Surface Materials And Properties, 5494 Instruments And Techniques
Scientific paper
A key challenge in the understanding of the mechanisms through which mass movement events occur is the development of proper measurements of strain across the mobile material. Conventional instrumentation, such as inclinometers and extensometers, provide high quality data, but only for a single point on the landslide. Interpretation of the movement of the whole mass thus requires considerable interpolation, introducing high levels of uncertainty. Similarly, the analysis of fall events has proven to be difficult because of the challenges of obtaining high quality precursory strain data and of assessing the actual geometry and location of the detached material. Terrestrial laser scanning technologies offer a solution to many of these problems, permitting high precision measurements of the surface of mobile, or potentially mobile, masses. Repeat scans, which can be analysed through the application of sophisticated mesh subtraction methods, permits the comparatively simple generation of comprehensive deformation maps, potentially resolving both pre- and post-failure deformations. The research presented in this paper has focussed upon the development of terrestrial laser scanning technologies for mass movement analysis. Were our focus is rock cliffs, where the technology has been used to examine the processes through which rockfalls are generated. The change maps from mesh subtraction have been used to examine the temporal and spatial distributions of the rockfall events. These data have been synthesised with other environmental datasets collected at the site, including air temperature, precipitation, cliff top groundwater level, wave-induced seismic energy release, joint geometry, and lithology. The magnitude - frequency relationships for rockfalls from the cliff as a whole, and from specific lithologies and areas of jointing, have been examined in the context of these environmental factors. The key role played by wave impacts and rainfall events has been highlighted. It is clear that existing models of cliff evolution, such as those that advocate mechanisms based upon notch formation at the cliff toe, oversimplify the dynamics of coastal cliff systems. Thus the research highlights how the new levels of data quality obtained through terrestrial laser scanning can permit new insights into mass movement processes to be gained.
Allison Richard
Dunning S.
Lim Marcus
Petley D.
Rosser N.
No associations
LandOfFree
The Application of Terrestrial Laser Scanning Techniques to the Investigation of Mechanisms of Mass Movement does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Application of Terrestrial Laser Scanning Techniques to the Investigation of Mechanisms of Mass Movement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Application of Terrestrial Laser Scanning Techniques to the Investigation of Mechanisms of Mass Movement will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-749758