Мақола

Suspended sediment source and propagation during monsoon events across nested sub-catchments with contrasted land uses in Laos

Sylvain HuonSorbonne Université UPMC Univ Paris 06, Institut d’Ecologie et des Sciences de l’Environnement de Paris (IEES Paris), Case 120, 4 Place Jussieu, 75252 Paris, Cedex 05, FranceOlivier EvrardLaboratoire des Sciences du Climat et de l’Environnement (LSCE), UMR 8212 (CEA-CNRS-UVSQ), Université Paris-Saclay, Domaine du CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, FranceElian GourdinLaboratoire des Sciences du Climat et de l’Environnement (LSCE), UMR 8212 (CEA-CNRS-UVSQ), Université Paris-Saclay, Domaine du CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, FranceIrène LefèvreLaboratoire des Sciences du Climat et de l’Environnement (LSCE), UMR 8212 (CEA-CNRS-UVSQ), Université Paris-Saclay, Domaine du CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, FranceThierry BariacSorbonne Université UPMC Univ Paris 06, Institut d’Ecologie et des Sciences de l’Environnement de Paris (IEES Paris), CNRS, Campus INRA, AgroParisTech, Bâtiment EGER, 78550 Thiverval-Grignon, FranceJean-Louis ReyssLaboratoire des Sciences du Climat et de l’Environnement (LSCE), UMR 8212 (CEA-CNRS-UVSQ), Université Paris-Saclay, Domaine du CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, FranceThierry Henry des TureauxIRD, National Agriculture and Forestry Research Institute (NAFRI), P.O. Box 4199, Ban Nogviengkham, Xaythany District, Vientiane, Lao Democratic People’s RepublicOloth SengtaheuanghoungDepartment of Agricultural Land Management (DALaM), P.O. Box 4199, Ban Nogviengkham, Xaythany District, Vientiane, Lao Democratic People’s RepublicSophie AyraultLaboratoire des Sciences du Climat et de l’Environnement (LSCE), UMR 8212 (CEA-CNRS-UVSQ), Université Paris-Saclay, Domaine du CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, FranceOlivier RibolziGéosciences Environnement Toulouse (GET), UMR 5563 (CNRS-UPS-IRD), 14 Avenue Edouard Belin, 31400 Toulouse, France

Journal of Hydrology Regional Studiesjournal2016en

ABI

Аннотация

Houay Xon catchment in northern Laos. Because agricultural headwater catchments of SE Asia are prone to erosion and deliver a significant proportion of the total suspended sediment supply to major rivers and floodplains, the potential sources of sediments and their dynamics were studied for two successive storm flow events in June 2013. Characterization of suspended sediment loads was carried out along a continuum of 7 monitoring stations, combining analyses of fallout radionuclides, particle borne organic matter and stream water properties. Radionuclide activities showed that remobilization of soil particles deposited during the previous rainy season or supplied by riverbank erosion is the dominant process, although pulses of surface-soil derived sediments also propagate downstream. This interpretation is supported by suspended organic matter data that also fingerprints the mixing of surface soil vs. subsurface particles. The study moreover highlights the advantages and the drawbacks of combining fallout radionuclides, particle borne organic matter composition and stream water characteristics to discriminate and quantify sediment sources and dynamics in rural areas undergoing urban sprawl.

Ҳали таржима қилинмаган

Мавзулар

Soil erosion and sediment transport Hydrology and Watershed Management Studies Hydrology and Sediment Transport Processes

Идентификаторлар

DOI: 10.1016/j.ejrh.2016.11.018

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