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Virtual velocity of tracers in a gravel-bed river using size-based competence duration

Milan, David J.

Authors

Dr David Milan D.Milan@hull.ac.uk
Senior Lecturer in Physical Geography; Programme Director BSc Physical Geography and Geography; Employability Officer

Abstract

Virtual velocity (Vi) of river gravels is commonly used to determine sediment transport rates and gravel dispersion dynamics. Virtual velocity is calculated from tracer gravel step-length data as the distance travelled divided by the duration of competence. However, no allowance is usually made for differences in competence duration according to grain size. In this investigation, Vi of gravel tracer clasts for the River Rede, Northumberland, UK, is calculated using a method that takes into consideration an approximation of size-based competence duration. Although scaled transport distance data compared favourably to past studies, it was the comparatively smaller clasts that tended to have lower Vi in comparison to coarser clasts, because of their longer competence duration, contrasting with previously published research. The key findings of the study serve as proof of concept and should be adopted in future studies that focus upon Vi estimation.

Journal Article Type Article
Publication Date Sep 15, 2013
Journal Geomorphology
Print ISSN 0169-555X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 198
Pages 107-114
Institution Citation Milan, D. J. (2013). Virtual velocity of tracers in a gravel-bed river using size-based competence duration. Geomorphology, 198, (107-114). doi:10.1016/j.geomorph.2013.05.018. ISSN 0169-555X
DOI https://doi.org/10.1016/j.geomorph.2013.05.018
Keywords Earth-Surface Processes
Additional Information This article is maintained by: Elsevier; Article Title: Virtual velocity of tracers in a gravel-bed river using size-based competence duration; Journal Title: Geomorphology; CrossRef DOI link to publisher maintained version: http://dx.doi.org/10.1016/j.geomorph.2013.05.018; Content Type: article; Copyright: Copyright © 2013 Elsevier B.V. All rights reserved.