Huon S., Evrard O., Gourdin E., Lefèvre I., Bariac T., Reyss J.L., Henry des Tureaux Thierry, Sengtaheuanghoung O., Ayrault S., Ribolzi Olivier. (2017). Suspended sediment source and propagation duringmonsoon events across nested sub-catchments with contrasted land uses in Laos. Journal of Hydrology : Regional Studies, 9, p. 69-84. ISSN 2214-5818.
Titre du document
Suspended sediment source and propagation duringmonsoon events across nested sub-catchments with contrasted land uses in Laos
Année de publication
2017
Type de document
Article
Auteurs
Huon S., Evrard O., Gourdin E., Lefèvre I., Bariac T., Reyss J.L., Henry des Tureaux Thierry, Sengtaheuanghoung O., Ayrault S., Ribolzi Olivier
Source
Journal of Hydrology : Regional Studies, 2017,
9, p. 69-84 ISSN 2214-5818
Study region: Houay Xon catchment in northern Laos.Study focus: Because agricultural headwater catchments of SE Asia are prone to erosion anddeliver a significant proportion of the total suspended sediment supply to major rivers andfloodplains, the potential sources of sediments and their dynamics were studied for twosuccessive storm flow events in June 2013. Characterization of suspended sediment loadswas carried out along a continuum of 7 monitoring stations, combining analyses of falloutradionuclides, particle borne organic matter and stream water properties.New hydrological insights: Radionuclide activities showed that remobilization of soil par-ticles deposited during the previous rainy season or supplied by riverbank erosion isthe dominant process, although pulses of surface-soil derived sediments also propagatedownstream. This interpretation is supported by suspended organic matter data that alsofingerprints the mixing of surface soil vs. subsurface particles. The study moreover high-lights the advantages and the drawbacks of combining fallout radionuclides, particle borneorganic matter composition and stream water characteristics to discriminate and quantifysediment sources and dynamics in rural areas undergoing urban sprawl.
Plan de classement
Transports solides et qualité physico-chimique des eaux [062MECEAU04]
Descripteurs
COURS D'EAU ; MATIERE EN SUSPENSION ; MATIERE ORGANIQUE ; AMENAGEMENT HYDROAGRICOLE ; CHIMIE DE L'EAU ; ISOTOPE RADIOACTIF ; MOUSSON
