Emmanuel Nduwayezu and François Noël from the group participated to the Journée des Aléas Gravitaires (JAG) in Nice – Sophia-Antipolis on October 8 to 10 2019. It was a great opportunity to exchange about many topics related to natural hazards and rockfalls. Early results from the ongoing analysis of the data from the rockfall experiment performed near Barcelonnette in 2018 were presented:
Application préliminaire du comportement d’impact observé sur de réelles de chutes de pierres à la simulation 3D sur modèles de terrain très détaillés
François Noël, Emmanuel Wyser, Michel Jaboyedoff, Clément Hibert, Miloud Talib, Jean-Philippe Malet, Renaud Toussaint, Mathilde Desrues, Franck Bourrier, David Toe, Ombeline Brenguier, Teresa Gracchi, Marc-Henri Derron, Catherine cloutier, Jacques Locat
Part of the Risk Analysis Group participated to the International Symposium on Rock Slope Stability 2018 in Chambéry, France, on 13 to 15 November 2018. It was a great opportunity to exchange about many topics related to natural hazards and rockfalls. The group presented two contributions as first authors whose titles are below:
- About the “rockfall” failure hazard assessment. Michel Jaboyedoff et al.
- Coupling 3D rockfall propagation to the spatio-temporal frequency for a realistic rockfall hazard mapping. Cécile D’Almeida et al.
The symposium concluded with very interesting field visits where we did learn about the history of the Mont Granier and its previous rock collapses and about the different instabilities that affects the gorges of Arly and how the local institutions manage them.
Part of the Risk Analysis Group participated to the 7th Canadian Geohazard Conference from the Canadian Geotechnical Society (CGS) in Canmore, Canada, on 3 to 6 June 2018. It was a great opportunity to exchange about many topics related to natural hazards, geotechnics and rockfalls. The group presented four contributions whose titles are below:
- Real-size rockfall experiment: How different rockfall simulation impact models perform when confronted with reality? Noël F., Wyser E., Jaboyedoff, Derron M.-H., Cloutier C., Turmel D. and Locat J.
- Using Average Velocities Of Deep-Seated Landslides To Develop Intensity-Frequency Scenarios. Jaboyedoff M., Aye Z.A., & Derron M.-H., Artigue V. and Gerber C.
- Automated decision sight distance evaluation based on airborne topographical data for risk management along linear infrastructures. Cloutier C., Locat J., Noël F. and Jaboyedoff M.
- Comparison between three rock slope hazard assessment methodologies based on the Åknes case study from Norway. Oppikofer T., Hermanns R.L., Jaboyedoff M., Derron M.-H., Brideau M.-A., Jakob M., Sturzenegger M.
The conference also included a very interesting field visit where we did learn about the flooding that happened in Canmore in 2013 and how the local institutions did respond them. The trip continued with the visit of local sites with mitigation measures and concluded with a dinner on the Sulphur Mountain where we could enjoy a gorgeous view on the Rockies near Banff while exchanging with the other participants.
The group participated to the Journée des Aléas Gravitaires (JAG) in Besançon on October 23 and 24 2017. It was a great opportunity to exchange about many topics related to natural hazards. The group presented 5 talks and a poster, whose titles are below:
Imagerie de mouvements non-gravitaires dans des parois rocheuses
M.H. Derron, L. Rouyet, A. Guerin, C. Lefeuvre et M. Jaboyedoff
Fréquence de départ des chutes de roches
Hantz, J. D’Amato, A. Guillemot, C. Epinat, A. Guerin, M. Jaboyedoff et J.P. Rossetti
La simulation des chutes de pierres : les modes de représentation des particules sources et le choix de leur distribution spatiale
Noël et M. Jaboyedoff
Passer de la vitesse moyenne des glissements profond à des scénarios intensité-fréquence
Jaboyedoff, V. Artigue, Z. C. Aye, M.H. Derron, C. Gerber et S. Lévy
Au sujet des processus gravitaires au Rwanda et principaux défis.
Nduwayedu, M. Jaboyedoff, J.B. Nsengiyumva et M.H. Derron
Exploratory numerical analysis of dramatic granular collapse: invariance of scaling laws
Wyser et M. Jaboyedoff
Antoine Guérin, François Noël and Emmanuel Wyser of the Risk Analysis Group (UNIL) went to Yosemite Valley from the October 6th to October 20th, 2016. They were there to pursue the yearly terrestrial LiDAR (TLS) acquisition of 3D model of most major cliffs (eg. El Capitan, Royal Arches, Three Brothers, Cathedral Rocks, Half Dome, etc.). This project was initiated by the University of Lausanne and financed by the Swiss National Science Foundation (SNSF). The park’s geologist Dr. Greg Stock, of the National Park Service (NPS), and Dr. Brian Collins from the U.S. Geological Survey (USGS) collaborate to the project.
The 63 TLS acquisitions were performed during about two weeks, when there was no rain or fog. Pictures of the cliffs were taken using a telephoto lens and a robotic camera mount to construct detailed gigapan mosaic pictures. The scree slope at the foot of Rhombus Wall was also characterized.