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Processus d'évolution d'un ravin de Basse-Provence, le ravin de l'Aurigon (Beaurecueil, Bouches du Rhône) : étude préliminaire (octobre 1991 - février 1996)

Abstract : The Aurigon gully is about one hundred meters long and its watershed is about one hectare. It is cut into Upper Cretaceous claystones on the southwestern piemont of the Sainte-Victoire mountain. In view of putting in an erosion measurement station, a preliminary equipment has been made using 42 pins. The goals of this equipment were to locally measure accumulation and erosion and to know the present day processes. The main methodological probleme has been instability of pins : we were obliged to use 275 of them. This instability is due to natural causes (pins washed away mainly in the main talwege or in the rills) and to human causes (pins pulled out by strollers). 54 series of measurements have been performed but the longest continuous series is only 51 measurements. The uncertainty about the true location of the lost pin and the disruption of claystones due to the driving in of the new pin reduce the validity of the results. On the whole, 2734 measurements have been performed that is to say 63.5 per pin. Field observations show that claystones are superficially altererd by several processes : hydroclasty and pellicular solifluction everywhere and gelifraction and pipkrakes gelifluction in winter mainly on the ubacs. This centimetric layer produces small dry screes that can be assisted by wind or by stollers passages. This thin layer is also removed by hydraulic processes during rains : very efficient splash and rill erosion. Rills are cut into the non altered claystones, except on ubacs. The most important part of erosion occurs during intense rainy phenomenons (september 1993)
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Jean-Louis Ballais. Processus d'évolution d'un ravin de Basse-Provence, le ravin de l'Aurigon (Beaurecueil, Bouches du Rhône) : étude préliminaire (octobre 1991 - février 1996). Bulletin du Réseau Erosion, 1997, 17, pp.37-45. ⟨hal-01567644⟩

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