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Communication Dans Un Congrès Année : 2011

Monitoring riverine sediment fluxes during floods : new tools and methods

Résumé

We report a new methodology to estimate the impact of extreme events on sediment transport in rivers. Our approach relies on two complementary instruments developed and tested during a 1.5 years field survey performed from june 2007 to january 2009 on the Capesterre river located on Basse-Terre island (Guadeloupe archipelago, Lesser Antilles Arc). The first one, CAPMES, performs real-time in-situ measurements of the water stage together with the concentration and the average grain size of suspended silts and sand particles. The second one, DRELIO, acquires high resolution stereophotogrammetric images of river beds used to compute DEMs and to 757 estimate how flash floods impact the granulometry and the morphology of the river. The combined use of these two instruments provides a platform of investigation of the erosive impact of extreme events in rivers exposed to the risk of flash floods. This platform can be used for either field campaigns of limited duration or long-term surveys of riverine sediment transport.
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Dates et versions

hal-01917118 , version 1 (19-11-2018)

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  • HAL Id : hal-01917118 , version 1

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Eric Lajeunesse, Christophe Delacourt, Pascal Allemand, Angela Limare, Céline Dessert, et al.. Monitoring riverine sediment fluxes during floods : new tools and methods. The 7th IAHR symposium on river, coastal and estuarine morphodynamics : RCEM2011, Sep 2011, Beijing, China. ⟨hal-01917118⟩
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