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Since the 1960s, the development of the Serre-Chevalier winter and summer resort has led to a rapid extension of the urban fabric on the territory of the village of St-Chaffrey. On July 9, 1981, the new neighborhoods built on the alluvial fan of the Verdarel torrent were partly devastated by a channeled debris flow. This disaster prompted the civil authorities to set up an extensive fluvial regulation...
Following a heavy rainfall, a channelled debris flow, which was bigger than 100 000 m 3 , caused extensive damage to infrastructures on the alluvial fan of the Bez torrent. The observations which were made during the event as well as the geomorphological survey of the catchment enable us to understand better the triggering of this debris flow. At the beginning of the event, there was a mud...
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