La dynamique d’un système fluvial et de ses zones humides en Afrique soudano-sahélienne au cours de l’Holocène.Approches géomorphologique et biogéographique. L'exemple du Yamé au Mali.

Aline Garnier 1
1 LETG - Caen - Littoral, Environnement, Télédétection, Géomatique
LETG - Littoral, Environnement, Télédétection, Géomatique UMR 6554
Abstract : This thesis proposes a long term evolution model of the fluvial system in order to understand the role of the controlling factors (natural and/or anthropogenic) on the past fluvial dynamics. This research is focused on the study of the Yamé catchment, a right bank tributary of the Niger River (Pays Dogon, Mali). Two approaches were developed to answer the research questions: (1) a geomorphological approach to reconstitute the hydro-sedimentary dynamics of the valley and, (2) a biogeographical approach informing on the Holocene vegetation dynamics, by means of phytoliths analysis. This work allows a better understanding on the transformations of the fluvial system as a response to climatic crises. Finally, this research questions the environmental consequences of the economic, societal and technical transitions which marked the last centuries, such as the emergence of agro-pastoral activities and the metal industry or more recently the population growth. This work finally proposes to highlight new knowledge about the climatic and anthropogenic evolution of western Africa, and more globally on the human impact on the sudano-sahelian environments.
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Aline Garnier. La dynamique d’un système fluvial et de ses zones humides en Afrique soudano-sahélienne au cours de l’Holocène.Approches géomorphologique et biogéographique. L'exemple du Yamé au Mali.. Géographie. Université de Caen Basse-Normandie, 2013. Français. ⟨tel-01084539⟩

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