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Genèse du système dunaire des Chtouka de l'Est (Maroc)

Abstract : Quite far from the present day limits of the deserts and situated some ten miles from the coastline, the Eastern Chtouka plain presents true desert areas and sand dunes. Wind constructions have formed a genuine dune system which is the most northern non coastal system in Atlantic Morocco. For years, the origin of this continental dune system had been considered as a problematic matter. So this work tends to be a contribution to the knowledge and understanding of the genesis of the dune system in the Eastern Chtouka. This study is structured around two main themes : on the one hand, the presentation of the living dune system, the various processes of its dynamics, aspects and modes of the present dune heaps and on the other hand a travel back into the past so as to check and discover possible links between morphological heritage (ancient layers of sediments) and the living dune system. All through this study, three plausible origins or sand transports have been examined : the action of rivers and streams flowing down the slopes of the Anti Atlas, the contribution of the Atlantic coast and a local development on the spot reshaping ancient formations. From a sound study of sedimentological results and what was noticed and checked on the spot, the first two theories have been discarded. To conclude, we assert that the origin of the dune system of the Eastern Chtouka is autochtonous. It is a matter of local development reshaping and recycling a pre-existing heritage which is the bedrock of the living dunes. This latter is constituted by the piling up of plio-quaternary systems both aeolian and fluvial. Each system is linked to precise morphoclimatic causes.
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Submitted on : Tuesday, April 24, 2018 - 4:00:30 PM
Last modification on : Monday, February 1, 2021 - 3:24:34 PM

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  • HAL Id : tel-01776451, version 1



Brahim Adele. Genèse du système dunaire des Chtouka de l'Est (Maroc). Géographie. Université Nancy 2, 1998. Français. ⟨NNT : 1998NAN21028⟩. ⟨tel-01776451⟩



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