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

The code calculates the slope for each point and finds the arrival point by searching for the last point with a weak slope, with a magnitude below 0,1, and also with a vertical value between 8 and 12,5. There are 2 criterias for the departure points. The first is that it has to be steep, with a gradient stronger than 2, and also it cannot have a long distance with a mild slope, gradient below 0,5. The coordinates for the departure points were exported to QGIS where they were combined with the contour lines in order to better examine the ensemble of points found by the program. The result is shown in Figure 16. The points which are in the middle of the sea are when the program was not capable of finding a departure zone. This phenomenon is present on the exit of both rivers. Generally the program gave consistent results that are seen by the continuity of points representing the departure points. Two zones were selected to show the discontinuities that are present. On both zones we observe the presence of many cliffs over one another and all of them are possible sources of rock falls. Figure 16 : combination of the departure points found by the program and the contour lines. Two zooms to demonstrate more problematic regions, just before the first river and on the beginning of the road 23