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La Garonne maritime à l'Holocène : dynamique, environnements et occupation humaine

Abstract : Fluvial systems changed considerably during the Holocene in response to climatic, eustatic, geologic and/or anthropogenic forcings. Various studies have been conducted on this subject but few of them focused specifically on the Garonne River or on upper estuaries. This study proposes a Holocene evolution model of the Garonne upper estuary. The aim is both to understand the palaeohydrological functioning of this river-ocean interface, to specify the environments of the valley bottom, and to better understand environment-Human relationship. The model is based on the interdisciplinary study of two sites with geomorphological and archaeological interests (Langoiran and Isle-Saint-Georges), paired with data available on the rest of the valley. The results show that: (i) The fluvial section acquired its tidal character during the mid-Holocene; (ii) The lower Garonne River went through at least three “fluvial” metamorphosis (Atlantic period; younger Subboreal /older Subatlantic; Xth c. BC – Xth c. AD) during the last 10,000 years; (iii) The River has been controlled unequally by hydrosedimentary flows coming from upstream and downstream; (iv) environment-Human relationship has been relatively strong; (v) The tide adds to all the factor standardly controlling the fluvial dynamics. The research highlights the singular dynamics of the upper estuaries and proposes a discussion on the concept of “fluvio-estuarine dynamics”.
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Submitted on : Monday, March 21, 2016 - 3:15:04 PM
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  • HAL Id : tel-01291469, version 1

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Séverine Lescure. La Garonne maritime à l'Holocène : dynamique, environnements et occupation humaine. Géographie. Université Paris 1 Panthéon-Sorbonne, 2015. Français. ⟨tel-01291469⟩

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