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Morphogénèse, activité érosive et détritisme alluvial holocènes dans le bassin de la moyenne Durance -

Abstract : The aim of the study is the evolution of alluvial detritism during the holocene in the moyenne durance catchment. Several methods are used : geomorphological and sedimento-stratigraphical analyses : dendrological analyses of subfossil trees well-preserved in holocene deposits; geoarcheological analyses of several sites in alluvial plain ; studies of ancien texts and maps. We observe an aggradation trend since the allerod to the beginning of atlantic. The most important sedimentation rates are during the boreal. Several detritic crisis are detected : at the beginning of younger dryas, at the end of preboreal, during the boreal and at the beginning of atlantic. They succeed with periods of morphological stability corresponding with river forest development (subfossil trees, pinus silvestris). Morphological crisis correspond with climatic crisis. This result accords with other recent paleoclimatical studies. Atlantic correspond with a pedogenic evolution on the slope, a reduction of accumulation rate and incision. This evolution is due to "forest optimum" and regular precipitations. Since atlantic, several crises are detected : during the beginning of subboreal, "la tene", later antiquity, modern times. They are related to climatic degradation and impact of anthropisation. This study point out the importance of climatic changes on the morphological evolution.
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Submitted on : Thursday, January 2, 2014 - 3:53:09 PM
Last modification on : Wednesday, April 3, 2019 - 1:56:06 AM
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  • HAL Id : tel-00923351, version 1

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Cécile Miramont. Morphogénèse, activité érosive et détritisme alluvial holocènes dans le bassin de la moyenne Durance -. Géomorphologie. Université de Provence - Aix-Marseille I, 1998. Français. ⟨tel-00923351⟩

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