English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/87934
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Citado 8 veces en Web of Knowledge®  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)
Título

Uncertainty in the evaluation of sediment yield from badland areas: Suspended sediment transport estimated in the Araguás catchment (central Spanish Pyrenees)

Autor Regüés-Muñoz, D. ; Nadal-Romero, Estela
Palabras clave Suspended sediment transport
Sediment concentration
Turbidity
Grain size
Uncertainty
Badlands
Fecha de publicación 2013
EditorElsevier
Citación Catena 106: 93-100 (2013)
ResumenBadlands are important in terms of sediment yield, particularly in mountain areas having subhumid and humid climatic conditions. Various studies concerning erosion and hydrological processes have demonstrated that suspended sediment transport is probably the main process in sediment export from badland areas. In the Araguás catchment (central Pyrenees) there is a statistically significant positive linear relationship between maximum discharge and the maximum suspended sediment concentration (SSC). The high frequency of hyper-concentrated fluxes of SSC (>500g·l-1) recorded at two gauging stations close to badland areas in the Pyrenees (Araguás) and the Alps (Draix) indicates that these fluxes are not uncommon, and suggests that they may transport relatively large suspended particles, especially during extreme floods. In a study involving sampling during two moderate floods (August 2006 and February 2007) in the Araguás catchment it was observed that the mean suspended sediment particle size was significantly greater during the highest SSC conditions. The results showed the great heterogeneity of particle sizes that can affect suspended sediment transport, which is usually estimated from concentration determined from turbidity values obtained using infrared devices and associated with the corresponding discharge value. Infrared turbidimeters have problems in detecting particles with a diameter (D)>0.1mm, although discharge can be evaluated with relative high accuracy. The combination of these factors suggests that the evaluation of sediment yield from badland areas using turbidity values involves significant uncertainty. If most suspended sediment is transported during moderate-high floods, which carry large quantities of suspended particles having D. >0.1. mm, then the sediment yield will be underestimated. The uncertainty can be calculated by determining the percentage and mean diameter of particles not detected, and the specific weight of the material. However, the uncertainty is not linear because of the exponential relationship between increasing diameter and the volume/mass, and consequently the error will increase with the growth in the suspended concentration. In this study the physical factors associated with uncertainty in the estimation of sediment yield were investigated, and quantitative estimates of the errors involved are provided. © 2012 Elsevier B.V.
Versión del editorhttp://dx.doi.org/10.1016/j.catena.2012.05.006
URI http://hdl.handle.net/10261/87934
DOI10.1016/j.catena.2012.05.006
ISSN0341-8162
Aparece en las colecciones: (IPE) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
CATENA668R1-Regües-Nadal.pdf733,97 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 



NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.