Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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
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 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 50–70 ms, 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.
Citation: Caviezel, A. and Gerber, W.: Brief Communication: Measuring Rock Decelerations and Rotation Changes During Short Duration Ground Impacts, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2018-89, in review, 2018.
Andrin Caviezel and Werner Gerber
Andrin Caviezel and Werner Gerber

Data sets

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

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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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