NDLI: Dominant discharges for suspended sediment transport in a highly active Pyrenean river

Content Provider	Springer Nature Link
Author	López Tarazón, José Andres Batalla, Ramon J.
Copyright Year	2014
Abstract	Dominant discharges and associated sediment dynamics of the River Isábena, a 445-km$^{2}$ catchment in the central Pyrenees of Spain that is punctuated by badlands, are analysed.Calculations of suspended sediment loads are based on continuous records of discharge and turbidity obtained at the basin outlet for the period 2005–2010.Dominant discharges for sediment load (i.e. effective discharge) present a bimodal distribution, with one peak falling in the range of low flows and the other associated to less frequent but higher magnitude floods (i.e. bankfull). The highly suspended sediment availability in the badlands, together with the high connectivity between the badlands and the stream network and the important in-channel fine sediment storage, causes both large and small events to remobilize fines. Baseflows, despite their low competence, generate resuspension and massive sediment loads. Thus, effective discharge (i.e. the discharge which transports most of the sediment) is not solely associated with bankfull (i.e. the discharge that dominates channel form), but to a wider range of discharges. Consequently, this river channel is not specifically adjusted to convey most of the sediment load during high floods, as in many other rivers, but instead large volumes of sediment are transferred downstream at an almost constant rate.Results suggest that dominant discharge may play a lesser role in terms of (suspended) sediment load in non-supply-limited fluvial systems and/or in rivers that permanently work close to, or at, full transport capacity, as is the case of the Isábena.
Starting Page	2019
Ending Page	2030
Page Count	12
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	14
Issue Number	12
e-ISSN	16147480
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-09-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bankfull Dominant discharge Effective discharge River Isábena Sediment duration curves Suspended sediment Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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