Transported by water or wind, sediments have a significant impact on the environment, and we cannot really quantify the magnitude of these events. A doctoral student at EPFL has proposed a new mathematical approach to these random phenomena. Pebble by pebble, stone by stone, from the mountains to the sea, bed load sediment transforms the environment and has a substantial impact, especially on bridges. It is threatening the waterways of Venice, and so much sand has rested in the bay of Mont Saint-Michel that it could lose its island status. Switzerland is also faced with damage caused by bed load sediment. Each year, water carries millions of tons of rock from mountains to valleys, and we cannot actually anticipate their quantity and behavior. It is around precisely this question that Joris Heyman based his thesis.
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