Rockfall trajectory reconstruction: a flexible method utilizing video footage and high-resolution terrain models
<p>Many examples of rockfall simulation software provide great flexibility to the user at the expense of a hardly achievable parameter unification. With sensitive site-dependent parameters that are hardly generalizable from the literature and case studies, the user must properly calibrate simu...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2022-11-01
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| Series: | Earth Surface Dynamics |
| Online Access: | https://esurf.copernicus.org/articles/10/1141/2022/esurf-10-1141-2022.pdf |
| Summary: | <p>Many examples of rockfall simulation software provide great
flexibility to the user at the expense of a hardly achievable parameter
unification. With sensitive site-dependent parameters that are hardly
generalizable from the literature and case studies, the user must properly
calibrate simulations for the desired site by performing back-calculation
analyses. Thus, rockfall trajectory reconstruction methods are needed. For
that purpose, a computer-assisted videogrammetric 3D trajectory
reconstruction method (CAVR) built on earlier approaches is proposed.
Rockfall impacts are visually identified and timed from video footage and
are manually transposed on detailed high-resolution 3D terrain models that
act as the spatial reference. This shift in reference removes the dependency
on steady and precisely positioned cameras, ensuring that the CAVR method
can be used for reconstructing trajectories from witnessed previous records
with nonoptimal video footage. For validation, the method is applied to
reconstruct some trajectories from a rockfall experiment performed by the
WSL Institute for Snow and Avalanche Research SLF. The results are compared
to previous ones from the SLF and share many similarities. Indeed, the
translational energies, bounce heights, rotational energies, and impact
positions against a flexible barrier compare well with those from the SLF.
The comparison shows that the presented cost-effective and flexible CAVR
method can reproduce proper 3D rockfall trajectories from experiments or
real rockfall events.</p> |
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| ISSN: | 2196-6311 2196-632X |