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Virtual velocity of sand transport in water

Parsons, A.; Cooper, J.; Wainwright, J.; Sekiguchi, T.

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Authors

A. Parsons

J. Cooper

T. Sekiguchi



Abstract

Using the 160-m-long flume at Tsukuba University we undertook an experiment to provide a first estimate of the virtual velocity of sand in the size range 0.5 – 2.0 mm. For the flow velocity used in our experiment this sediment-size range would conventionally be regarded as suspended sediment. The virtual velocity is found to be 37-41 % of the flow velocity. Paradoxically, virtual velocity decreases as particle size decreases. Such a lower virtual velocity of finer sediment is not inconceivable. First, trapping of the sediment appears to be a function of bed roughness, and there is a probable relationship between bed roughness and trapping efficiency for particles of different sizes. Secondly, finer particles are more likely to find sheltered positions on a rough bed and thus experience lower mobility, relative to the more exposed coarser grains, as observed for bedload transport. Thirdly, the virtual velocity of particles undergoing bedload transport has been found, in some instances, to be lower for finer clasts. We combine our data with previous studies of virtual velocity of bedload to develop, for the first time, an hypothesis for an holistic analysis of sediment movement in rivers.

Citation

Parsons, A., Cooper, J., Wainwright, J., & Sekiguchi, T. (2018). Virtual velocity of sand transport in water. Earth Surface Processes and Landforms, 43(3), 755-761. https://doi.org/10.1002/esp.4262

Journal Article Type Article
Acceptance Date Sep 12, 2017
Online Publication Date Oct 17, 2017
Publication Date Mar 15, 2018
Deposit Date Oct 6, 2017
Publicly Available Date Mar 29, 2024
Journal Earth Surface Processes and Landforms
Print ISSN 0197-9337
Electronic ISSN 1096-9837
Publisher British Society for Geomorphology
Peer Reviewed Peer Reviewed
Volume 43
Issue 3
Pages 755-761
DOI https://doi.org/10.1002/esp.4262

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Copyright Statement
This is the accepted version of the following article: Parsons, A., Cooper, J., Wainwright, J. & Sekiguchi, T. (2017). Virtual velocity of sand transport in water. Earth Surface Processes and Landforms, 43(3): 755-761, which has been published in final form at https://doi.org/10.1002/esp.4262. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.





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