The full-scale avalanche test-site at Lautaret Pass (French Alps)

Emmanuel Thibert, Hervé Bellot, Xavier Ravanat, Frédéric Ousset, Gaëtan Pulfer, Mohamed Naaim, Pascal Hagenmuller, Florence Naaim-Bouvet, Thierry Faug, Koichi Nishimura, Yoichi Ito, Djebar Baroudi, Alexander Prokop, Peter Schön, Alvaro Soruco, Christian Vincent, Ali Limam, Raphaële Héno

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)
299 Downloads (Pure)

Abstract

The full-scale avalanche test site at Lautaret Pass in the southern French Alps has been used by IRSTEA-Cemagref Research Institute since 1972. Over recent years, two avalanche paths have been used routinely to release avalanches and study avalanche dynamics and interactions between avalanches and obstacles. Avalanche flows are generally dense and dry, sometimes with a powder cloud on top. Main avalanche path no. 2 is dedicated to studies on avalanche dynamics. Within the flow of the avalanche, flow height and vertical profiles of pressure and velocity are measured along a 3.5 m tripod. The snow volume released in the release zone is quantified by differential analysis of laser scanning measurements performed before and after triggering. High-speed positioning of the avalanche front along the track is carried out by terrestrial oblique photogrammetry. Above the dense layer, the upper layer of the avalanche is characterized by particle and air flux measurements. Avalanche path no. 1 is smaller in size and particularly well-suited to experiments on structures exposed to small to medium-size avalanches (< 1000 m3). A macroscopic sensor structure consisting of a one square-meter plate supported by a 3.5 m high steel cantilever beam is fixed in the ground, facing the avalanche. Impact pressures are reconstructed from the beam deformations and avalanche velocity is measured by optical sensors. For these experimental devices dedicated to improving our understanding of avalanche physics, a national and international partnership has been developed over the years, including INSA de Lyon, CNRS and Université Joseph Fourier (France), Aalto University (Finland), Nagoya University (Japan), Boku University (Austria) and IGEMA (Bolivia).
Original languageEnglish
Pages (from-to)30-41
JournalCold Regions Science and Technology
Volume115
Issue numberJuly 2015
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Keywords

  • Avalanche dynamics
  • Avalanche science
  • Avalanche test-site
  • impact pressure
  • instrumentation

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