Suspended sediment and 137Cs fluxes during the exceptional December 2003 flood in the Rhone River, southeast France

Antonelli, Christelle; Eyrolle, Frédérique; Rolland, B.; Provansal, Mireille; Sabatier, François

doi:10.1016/j.geomorph.2007.06.007

Cited by 87 publications

(75 citation statements)

References 22 publications

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“…The Rhô ne River accounts for 80% of the riverine particle inputs into the Gulf of Lions (Aloisi et al, 1979), most of it being delivered during episodic and extreme flood events (Pont, 1997;Antonelli et al, 2008). The highly dynamic prodelta of the Rhô ne River, with OM from contrasting origins (marine vs terrestrial) including modern vascular C3 plant detritus, soils and freshwater phytoplankton (Kim et al, 2010;Bourgeois et al, 2011;Cathalot et al, 2013) can thus be used as a model system to test the hypothesis that the OM quality and source are fundamental structuring factors for the microbial communities in benthic environments.…”

Section: Introductionmentioning

confidence: 99%

River organic matter shapes microbial communities in the sediment of the Rhône prodelta

et al. 2014

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Microbial-driven organic matter (OM) degradation is a cornerstone of benthic community functioning, but little is known about the relation between OM and community composition. Here we use Rhô ne prodelta sediments to test the hypothesis that OM quality and source are fundamental structuring factors for bacterial communities in benthic environments. Sampling was performed on four occasions corresponding to contrasting river-flow regimes, and bacterial communities from seven different depths were analyzed by pyrosequencing of 16S rRNA gene amplicons. The sediment matrix was characterized using over 20 environmental variables including bulk parameters (for example, total nitrogen, carbon, OM, porosity and particle size), as well as parameters describing the OM quality and source (for example, pigments, total lipids and amino acids and d 13 C), and molecular-level biomarkers like fatty acids. Our results show that the variance of the microbial community was best explained by d 13 C values, indicative of the OM source, and the proportion of saturated or polyunsaturated fatty acids, describing OM lability. These parameters were traced back to seasonal differences in the river flow, delivering OM of different quality and origin, and were directly associated with several frequent bacterial operational taxonomic units. However, the contextual parameters, which explained at most 17% of the variance, were not always the key for understanding the community assembly. Co-occurrence and phylogenetic diversity analysis indicated that bacteria-bacteria interactions were also significant. In conclusion, the drivers structuring the microbial community changed with time but remain closely linked with the river OM input.

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Section: Introductionmentioning

confidence: 99%

River organic matter shapes microbial communities in the sediment of the Rhône prodelta

et al. 2014

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“…Mais l'incision du chenal au sein des formations graveleuses datant du Pléistocène réinjecte des sables, des graviers et des galets, déstocke d'importants volumes de matériaux qui forment une nouvelle charge de fond. Le rapport entre ces deux forçages semble nettement à l'avantage du premier : la crue de 2003 a véhi-culé en Arles 15 % de sable et 85 % de limon et d'argile (Antonelli et al, 2008) alors que Surell estime en 1847 que le charriage représente le tiers ou le quart du flux solide total en période de crue.…”

Section: Interprétation Et Discussionunclassified

“…Pourtant, le Bas-Rhône constitue une « zone-clé » essentielle dans les relations entre le bassin-versant et le milieu océanique, aussi bien pour le transfert de la charge sédi-mentaire que pour les différents polluants dont celle-ci est le vecteur (Santiago et al, 1994 ;Duffa et Renaud, 2005 ;Periáñez, 2005 ;Eyrolle et al, 2007 ;Antonelli et al, 2008 (Bruneton, 1999 ;Stanley et Jorstad, 2002). Celle-ci est accélérée par un relèvement continu du niveau marin au cours de l'Holocène (Vella et Provansal, 2000), qui se stabilise à une vitesse de l'ordre de 2 mm/an au cours des derniers siècles (Suanez et Provansal, 1998).…”

Section: Introductionunclassified

Transferts sédimentaires dans le Bas-Rhône depuis le milieu du 19e siècle : essai de quantification

Maillet

Raccasi

Provansal

et al. 2009

gpq

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Résumé En raison des contraintes géographiques et hydrographiques qui le caractérisent (influence des affluents méditerranéens, affaiblissement du profil longitudinal, proximité du niveau marin), le Bas-Rhône présente une tendance historique au stockage des sédiments dans sa plaine d’inondation, responsable de la progradation de la plaine deltaïque. Il constitue aujourd’hui une zone-clé essentielle à la compréhension des relations entre le bassin-versant et le milieu océanique, aussi bien pour le transfert de la charge sédimentaire que pour les différents polluants dont celle-ci est le vecteur. Il apparaît donc nécessaire de déterminer quelle est sa capacité de transfert et quelle part du transit sédimentaire est stockée dans les différents compartiments de cet espace. Les données utilisées sont issues de sources bibliographiques directes (mesures in situ, travaux de quantification) et indirectes (superposition de cartes bathymétriques, reconstitution de l’historique des débits). Disponibles à diverses échelles temporelles et spatiales, ces sources permettent de proposer un bilan du fonctionnement sédimentaire depuis 150 ans et d’analyser les discontinuités du transit particulaire, en tenant compte de la part du stockage (permanent ou temporaire) dans les lits fluviaux et du transfert vers l’embouchure, puis le littoral et la plate-forme continentale. Ce bilan démontre que le Rhône actuel est un bon conducteur de sa charge solide jusqu’à l’embouchure et que cette dernière stocke de moins en moins le flux sédimentaire. Ce fonctionnement est interprété comme étant la conséquence des aménagements qui contraignent l’écoulement fluvial depuis le milieu de 19e siècle.

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“…The SORA sampling station is situated closed to the CNR water discharge gauging station. The SORA station has been in use in its current configuration since 2003, and the sampling procedures evolved in the framework of routine water quality monitoring [17] or for specific studies [4,14]. The current sampling scheme has been homogeneous since 2008 and water sample collection is described in detail in [12,17].…”

Section: Water and Suspended Solids Samplingmentioning

confidence: 99%

“…Its catchment area is characterized by great climatic and geological heterogeneity and the river has been under various anthropogenic influences for several decades (damming, river embankment, industrial and domestics effluents, and nuclear power plants). At the lower course of the river numerous studies have been dedicated to solid fluxes and associated contaminants with a particular emphasis on floods since such events have been shown to play a fundamental role on fluxes of suspended sediment [3][4][5], trace and major elements [2,5,6] and artificial radionuclides [7]. Studies also focused on sediment and contaminant storages and dynamics in alluvial margins [7][8][9], and allowed to assess the origins and subsequent levels of artificial radionuclides [10].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of naturally occurring radionuclides in the Lower Rhone River (France): preliminary results from suspended solid monitoring

Zebracki

Eyrolle

Cagnat

et al. 2013

Water Resources Management VII

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Long term time series acquired in the frame of radioecological monitoring programmes are useful tools for exploring the variability of naturally occurring radionuclide contents. The data set was established in order to investigate the role of discharge, flood type and flood chronicles on such variability within the suspended sediments. Preliminary results show that radionuclide geochemical properties as well as suspended sediment nature and particle residence time may in some particular cases significantly affect the U-Th series nuclide equilibrium.

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Suspended sediment and 137Cs fluxes during the exceptional December 2003 flood in the Rhone River, southeast France

Cited by 87 publications

References 22 publications

River organic matter shapes microbial communities in the sediment of the Rhône prodelta

River organic matter shapes microbial communities in the sediment of the Rhône prodelta

Transferts sédimentaires dans le Bas-Rhône depuis le milieu du 19e siècle : essai de quantification

Characterisation of naturally occurring radionuclides in the Lower Rhone River (France): preliminary results from suspended solid monitoring

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