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stnParabel, formerly Trajecto3D, is a rockfall simulation software designed for applied research to natural hazards and for education. It is designed to be able to test new rebound models in the context of practice, in order to have the opinion of expert practitioners, who are often those with the most case studies and contact with the field.

The development of the tool by François Noël began in 2015 at the Laboratoire d'Étude sur les Risques Naturels (LERN) of the Department of Geology and Geological Engineering at Laval University. It was done in parallel with the realization of work on rockfalls for the ParaChute project, under the direction of Jacques Locat, and supervised by Catherine Cloutier and Dominique Turmel.

During this project, the Rockyfor3D software together with the automation tools developed were used to identify in advance, over an area of ​​approximately 1,250 square km, the priority sites where to subsequently carry out field visits and various in-depth analyzes. stnParabel was not initially developed to replace the regional analysis capacity of Rockyfor3D, but rather to deepen the analysis at the local level by being able to take into account of the geometry and roughness of the terrain precisely, to follow up on the recommendations of François Noël's master thesis.

The development of the tool continued from 2017 to now through research work on rockfalls in view of obtaining a doctoral thesis by François Noël. This work was carried out within the Risk Analysis Group of the Faculty of Geosciences and the Environment of the University of Lausanne, under the direction of Professor Michel Jaboyedoff. The various works focused among other things on:

  • The study of different sites that have been affected by rockfall in the past and testing different software and rebound models available on these sites;

  • Data acquisition for understanding the dynamics of impacts and comparing existing rebound models in collaboration with teams from different backgrounds (EOST, INRAE, SLF, Sage Engineering, DICEA and RTM of the ONF);

  • The improvement of the impact detection algorithm on point clouds used by stnParabel and the addition of impact detection against trees with the participation of the Prévention des dangers naturels of the Direction générale de l'environnement of the Canton of Vaud;

  • The development of different rebound models, including those tested in stnParabel.

Now it's your turn to take part in the applied research by testing the experimental rebound models and stnParabel at known sites and comparing them to software generally used in practice. Your comments are always welcome.

François Noël