RINA - Démonstrateur d’utilisation de l’intelligence artificielle pour la gestion opérationnelle des risques naturels gravitaires géologiques | FEREC 2020

10 CHAPTER 1. RÉUNION ROCKFALL DATA ANALYSIS We can see on right figure that lower layer predominance is mostly present before PR 5 and after 10. Figure 1.1: Daily time series for the number of rockfall (top) and for quantity of rainfall (bottom) before (left) and after (right) major protection works 1.4 Conclusion First analysis on RN1 data show: • a clear change-point in rockfall hazard after major works in 2008. We will focus on data before 2008 because there are much more,