المستخلص: |
The torrentiality in the sector of Bni Oulid (Ouerrha’s High Valley) constituted one of the most spectacular demonstrations of the morphogenese in this sector of Rif's mountain. The study of principal Holocene formation and four cone’s torrentials generations, in which they are encased, highlights several torrential working lives. Cone’s installation and provision would be controlled by dynamic’s elements of the Ouerrha’s alluvial plain. Declanched since 3000 BP, this torrentiality depended on the predisposition of the grounds to erosion, anthropisation’s slopes, degradation of vegetable cover and precipitation’s mode. These results corroborate the data of palynology and confirm deforestation in the Rif mountain.
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