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Estimating rockfall frequency in a mountain limestone cliff using terrestrial laser scanner

Abstract : Terrestrial laser scanner has been used to detect rockfalls which occurred in a high rock wall of the Subalpine Chains, from a survey station located up to 900 m from the cliff. Using a threshold of 0.1 m in term of distance variation, 344 rockfalls larger than 0.05 m 3 have been detected for a period of 1180 days, in a rock wall of width 750 m and height 200 m. The complementary cumulative distribution of the rockfall volume is well fitted by a power law, with an exponent b of 0.75 ± 0.04. In order to compare the rockfall frequencies in different geological contexts, a rockfall activity parameter has been considered, which is the number of rockfalls larger than a given volume, which occur per century and per hm 2. For the thinly bedded limestone making the cliff surveyed, the number of rockfalls larger than 1 m 3 is 0.85 rockfalls per year and per hm 2. It is two orders of magnitude higher than the number obtained for massive limestone cliffs of the Subalpine Chains in the Grenoble area.
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https://hal-insu.archives-ouvertes.fr/insu-03598668
Contributor : Didier Hantz Connect in order to contact the contributor
Submitted on : Saturday, March 5, 2022 - 5:24:25 PM
Last modification on : Thursday, March 10, 2022 - 3:32:43 AM

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  • HAL Id : insu-03598668, version 1

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A Guerin, J-P Rossetti, D Hantz, M Jaboyedoff. Estimating rockfall frequency in a mountain limestone cliff using terrestrial laser scanner. [Research Report] Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, Univ. Gustave Eiffel, ISTerre, 38000 Grenoble, France. 2013. ⟨insu-03598668⟩

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