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Morphodynamique d'un banc de galets en rivière aménagée lors de crues

Abstract : This work deals with the morphodynamics of a gravel bar in an engineered mountain stream, the River Arc (France). The analysis is based on field measurements during three reservoir releases and a natural high flow event. Original methods have been used and improved (LS-PIV and analysis of aerial pictures). The evolution of suspended sediments along the river is described according to observations during flushing flows. Morphological changes of the studied gravel bar were analysed for the four events, and for in-between time periods. Over the time of the study, the bar was strengthened, even if the flushings and the flood induced opposit changes and transverse channels were deeply eroded. Deposits of fine sediments have been estimated on the entire surface of the gravel bar.
Moreover numerical modelling owing to Rubar20TS has been performed to calculate flow fields and sediment transport during a flushing event and during the flood. Qualitatively, calculated morphological changes agree with measurements.
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https://tel.archives-ouvertes.fr/tel-00198125
Contributor : Magali Jodeau <>
Submitted on : Sunday, December 16, 2007 - 5:55:58 PM
Last modification on : Monday, May 18, 2020 - 2:36:27 PM
Long-term archiving on: : Monday, April 12, 2010 - 8:05:58 AM

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Magali Jodeau. Morphodynamique d'un banc de galets en rivière aménagée lors de crues. Physique [physics]. Université Claude Bernard - Lyon I, 2007. Français. ⟨tel-00198125⟩

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