The graded alluvial river

Profile concavity and downstream fining

Journal Article (2016)
Author(s)

Astrid Blom (TU Delft - Rivers, Ports, Waterways and Dredging Engineering)

E. Viparelli (University of South Carolina)

V. Chavarrias Borras (TU Delft - Rivers, Ports, Waterways and Dredging Engineering)

Research Group
Rivers, Ports, Waterways and Dredging Engineering
Copyright
© 2016 A. Blom, Enrica Viparelli, V. Chavarrias Borras
DOI related publication
https://doi.org/10.1002/2016GL068898
More Info
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Publication Year
2016
Language
English
Copyright
© 2016 A. Blom, Enrica Viparelli, V. Chavarrias Borras
Research Group
Rivers, Ports, Waterways and Dredging Engineering
Issue number
12
Volume number
43
Pages (from-to)
6285-6293
Reuse Rights

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Abstract

There has been quite some debate on the relative importance of particle abrasion and grain size selective transport regarding the river profile form and the associated grain size trends in a graded alluvial stream. Here we present new theoretical equations for the graded alluvial river profile that account for the effects of particle abrasion and grain size selective transport in the absence of subsidence, uplift, and sea level change. Under graded conditions we find that abrasion results in a mild profile concavity and downstream fining, whereas under aggradational conditions grain size selective transport can lead to large spatial changes in channel slope and bed surface mean grain size.

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