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Virtual velocity of sand transport in water.

Parsons, A. and Cooper, J. and Wainwright, J. and Sekiguchi, T. (2018) 'Virtual velocity of sand transport in water.', Earth surface processes and landforms., 43 (3). pp. 755-761.


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.

Item Type:Article
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Publisher 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 This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Date accepted:12 September 2017
Date deposited:09 October 2017
Date of first online publication:17 October 2017
Date first made open access:17 October 2018

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