Analyse comparée de la dynamique des îles fluviales de trois grands cours d’eau – Lena, Napo et Loire

Abstract : This paper is dedicated to the analysis of fluvial islands that have been neglected by the scientific literature. Associated to the anabranching fluvial pattern, fluvial islands are generally considered as stable landforms. The study is based on three rivers that develop islands in different climatic and hydrologic environments: the Loire River (France), the Rio Napo (Peru) and the Lena River (Siberia). On the basis of a diachronic analysis, the mobility of islands is demonstrated at a pluri-decadal temporal scale. Evolution models and island patterns are determined with regards to their migration rate and to their formation processes. On a shorter time scale, two main sedimentation mechanisms are identified: vertical accretion is the dominant process on young islands, whereas older islands are mainly constructed by lateral accretion.
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Submitted on : Thursday, November 28, 2019 - 4:37:14 PM
Last modification on : Saturday, November 30, 2019 - 1:41:08 AM

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  • HAL Id : hal-02385174, version 1

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Emmanuele Gautier, Stéphane Grivel, Coral Garcia Govea, Thomas Depret, Clément Virmoux, et al.. Analyse comparée de la dynamique des îles fluviales de trois grands cours d’eau – Lena, Napo et Loire. Bulletin de la Société Géographique de Liège, Société Géographique de Liège, 2016, pp.125-141. ⟨hal-02385174⟩

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