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

change in the behaviour of the cliff and previous works used data from this year with no special treatment. It is believed the data received is incomplete so the period with no data will not be considered. Thesecond part after 2007 also sees a significant reduction in the number of events. This can be associated with the beginning of construction of protective structures and this change will also be considered. Besides, the number of events also follows a seasonal nature. The values peak between December and January, the same moment as the rain peaks as observed in Figure 8. Figure 8: Evolution of the amount of rain and the number of rockfall in fonction of time A representation of the number of events along the road before (FIG à ajouter??) and after the construction of protective structures allows the visualisation of the difference of the amount of events, but also their spatial distribution. Observing only the events that occurred before 2008, some zones are noticed with fewer events. The most noticeable is the region before pr 3+500. This can simply be explained by the fact that this region already had protected elements installed (Figure 9). 16