La plaine alluviale de la Moyenne Garonne toulousaine au cours de l’holocène : apport d’une approche croisée archéologie et géomorphologie

Abstract : Through the prism of multidisciplinarity, the dichotomy between environment and human impacts is reduced as strong interrelationships in thresholds have been demonstrated. The valleys are favored supports of human-environnement relations, and many rivers have been the subject of this type of study in recent years. The Garonne’s choice result of a scientific blank in the most part of the channel in the South West of France, especially the middle section. Therefore this work focuses on the study of the relationship between human occupation and the low plain from Toulouse to the confluence of the Tarn since 10000 years. The valley is 25km wide in Toulouse and is the first Pyrenean flood spreading area, enabling the recording of past occupations and the alluvial dynamic associated. Without local repository, geomorphological and archaeological chronological framework was established for the Holocene, based on works completed in European and continental channels. These two component were analyzed separately on the plain of the Garonne river with a multidisciplinary approach. The results show that the floodplain’s occupation is continuous since the Neolithic, despite restitution biased by modern development works and taphonomy. This aspect is characterized by a high mobility channel f the Garonne and the identification of at least two episodes of incision in the 2nd Holocene and a net sedimentation decrease since Antiquity.
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Laurie Ferdinand. La plaine alluviale de la Moyenne Garonne toulousaine au cours de l’holocène : apport d’une approche croisée archéologie et géomorphologie. Géographie. Université Toulouse le Mirail - Toulouse II, 2014. Français. ⟨NNT : 2014TOU20069⟩. ⟨tel-01246400⟩

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