NDLI: Core-derived historical records of suspended sediment origin in a mesoscale mountainous catchment: the River Bléone, French Alps

Content Provider	Springer Nature Link
Author	Navratil, Oldrich Evrard, Olivier Esteves, Michel Ayrault, Sophie Lefèvre, Irène Legout, Cédric Reyss, Jean Louis Gratiot, Nicolas Nemery, Julien Mathys, Nicolle Poirel, Alain Bonté, Philippe
Copyright Year	2012
Abstract	Quantifying suspended sediment fluxes and dynamics across mountains, and identifying the origin of sediment in severely eroded areas, are of primary importance for the management of water resources. This contribution aims to generalise previous results from suspended sediment fingerprinting obtained during 2007–2009 in a mesoscale Alpine catchment (the Bléone River; 905 km$^{2}$) in France, and to assess variability in sediment sources throughout the second half of the twentieth century.Sediment fingerprinting, based on elemental geochemistry and radionuclide measurements, was conducted on a sediment core collected in an alluvial floodplain at the basin outlet. This technique was combined with hydro-sedimentary time-series to reconstruct the origin of suspended sediment deposited at this location over the last 50 years.Interpretation of sedimentation based on historical hydrological databases corroborates core dating obtained with $^{137}$Cs and $^{210}$Pb$_{xs}$ activity measurements. Black marls and (marly) limestone sources provided the main fraction of sediment throughout the sequence (40 and 22 %, respectively). However, we also found evidence for the occurrence of major floods carrying large quantities of sediment originating from Quaternary deposits and conglomerates (25 and 16 %, respectively). The variability of sediment sources throughout the sequence may reflect the spatial variability of rainfall within the catchment, which in turn reflects its origin. However, the relatively homogeneous sediment composition throughout the sequence confirms that core-derived information is representative of widespread flood events.These results are consistent with those obtained in previous studies. They also outline the need to take into account the entire grain size range of fine sediment in order to provide an overall picture of sediment sources and transfers within highly erosive catchments. This study also emphasizes the importance of using archival data to validate the results of sediment fingerprinting studies conducted during short contemporary monitoring programmes, and to extend fingerprinting of sediment sources over longer time-scales which include large and widespread floods.
Starting Page	1463
Ending Page	1478
Page Count	16
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	12
Issue Number	9
e-ISSN	16147480
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-08-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Braided river Erosion Geochemistry Radionuclide Sediment core Sediment fingerprinting Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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