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Water-Worked Gravel Bed: State-of-the-Art Review

1
Department of Civil Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India
2
Dipartimento di Ingegneria Civile, Università della Calabria, 87036 Rende, Italy
*
Author to whom correspondence should be addressed.
Water 2019, 11(4), 694; https://doi.org/10.3390/w11040694
Received: 6 March 2019 / Revised: 22 March 2019 / Accepted: 2 April 2019 / Published: 4 April 2019
(This article belongs to the Special Issue Water-Worked Bedload: Hydrodynamic and Mass Transport)
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Abstract

In a natural gravel-bed stream, the bed that has an organized roughness structure created by the streamflow is called the water-worked gravel bed (WGB). Such a bed is entirely different from that created in a laboratory by depositing and spreading gravels in the experimental flume, called the screeded gravel bed (SGB). In this paper, a review on the state-of-the-art research on WGBs is presented, highlighting the role of water-work in determining the bed topographical structures and the turbulence characteristics in the flow. In doing so, various methods used to analyze the bed topographical structures are described. Besides, the effects of the water-work on the turbulent flow characteristics, such as streamwise velocity, Reynolds and form-induced stresses, conditional turbulent events and secondary currents in WGBs are discussed. Further, the results form WGBs and SGBs are compared critically. The comparative study infers that a WGB exhibits a higher roughness than an SGB. Consequently, the former has a higher magnitude of turbulence parameters than the latter. Finally, as a future scope of research, laboratory experiments should be conducted in WGBs rather than in SGBs to have an appropriate representation of the flow field close to a natural stream. View Full-Text
Keywords: fluvial hydraulics; gravel-bed stream; turbulent flow; water-worked gravel bed fluvial hydraulics; gravel-bed stream; turbulent flow; water-worked gravel bed
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Padhi, E.; Dey, S.; Desai, V.R.; Penna, N.; Gaudio, R. Water-Worked Gravel Bed: State-of-the-Art Review. Water 2019, 11, 694.

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