Institut des
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Accueil > Evénements > Séminaires > Archives 2016 > Morphologie des rivières
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Séminaire général de l’INSP

Morphologie des rivières alluviales - Olivier Devauchelle - Jeudi 17 mars à 16 h 30

INSP - 4 place Jussieu - 75252 PARIS Cedex 05 - Barre 22-23 - 3e étage, salle 317

Olivier Devauchelle, chercheur à l’Institut de Physique du Globe

Abstract

Alluvial rivers build their own bed with the sediment they transport. As they do so, they spontaneously select their size and organize themselves into a beautiful variety of shapes, including meanders, braids and ramified networks. Despite their apparent randomness, these structures show remarkably constant geometrical features : the streams’ size, slope and shape are tightly related to water discharge and sediment load. We will illustrate how the physics of sediment transport maintain these features across scales ranging from that of a sand grain to the width of the Amazon.