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Discussion papers | Copyright
https://doi.org/10.5194/nhess-2018-89
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Brief communication 16 May 2018

Brief communication | 16 May 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Natural Hazards and Earth System Sciences (NHESS).

Brief Communication: Measuring Rock Decelerations and Rotation Changes During Short Duration Ground Impacts

Andrin Caviezel1 and Werner Gerber2 Andrin Caviezel and Werner Gerber
  • 1WSL Institute for Snow and Avalanche Research SLF, CH-7260 Davos Dorf
  • 2Swiss Federal Institute for Forest, Snow and Landscape Research WSL, CH-8903 Birmensdorf

Abstract. Rockfall trajectories are primarily influenced by ground contacts, causing changes in acceleration and rock rotation. The duration of contacts and its influence on the rock kinematics are highly variable and generally unknown. The lack of knowledge hinders the development and calibration of physics based rockfall trajectory models needed for hazard mitigation. To address this problem we placed three-axis gyroscopes and accelerometers in rocks of various sizes and shapes with the goal of quantifying rock deceleration in natural terrain. Short ground contacts range between 8–15 milliseconds, longer contacts between 50–70ms, totalling to only 6% of the runtime. Our results underscore the highly non-linear character of rock-ground interaction and the basic difficulties underlying rockfall hazard mitigation.

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Andrin Caviezel and Werner Gerber
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Andrin Caviezel and Werner Gerber
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Induced Rockfall Dataset (Small Rock Experimental Campaign), Tschamut, Grisons, Switzerland A. Caviezel, Y. Bühler, M. Christen, and P. Bartelt https://doi.org/10.16904/envidat.37

Andrin Caviezel and Werner Gerber
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Latest update: 17 Aug 2018
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Short summary
Anticipating the flight path of a bouncing object wields fascination over playing children and scientists alike. While the path of a ball can be judged easily, the erratic rebound behaviour of complex shaped forms are intriguing. Here, we focus on the time scales and rotation changes during real rock-ground impacts while travelling down a slope. Specialized sensors inside the rock track those changes and reveal contact times in the millisecond range defining the overall flightpath behaviour.
Anticipating the flight path of a bouncing object wields fascination over playing children and...
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