Effect of sediment properties on incipient motion of large solitary particles on fixed bed

Date

2021-01-01

Author

Gogus, Mustafa
Haspolat, Emre

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© 2021 ICE Publishing: All rights reserved.The effect of sediment properties such as shape, size, specific weight and packing (support) condition on the incipient motion of large solitary particles was systematically investigated. A series of experiments was conducted in a rectangular tilting flume with a smooth fixed (rigid) bed under uniform flow conditions. In each experiment, a thin fibreglass rectangular rod of height 1/5 or 1.5/5 of the height of the particle was placed just downstream of the particle to imitate the interaction of particles in rivers. Contrary to common belief and knowledge, it was found that the Shields parameter decreased as the dimensionless grain diameter increased for a given bed slope under rough turbulent flow conditions. Moreover, a larger shear stress was needed to start the motion of particles on steeper slopes for a given particle diameter. An increase in the ratio of the support height to particle height by 50% resulted in an increase in the dimensionless critical shear stress by almost six times for the same particle and relative roughness.

Subject Keywords

hydraulics & hydrodynamics, river engineering, sewers & drains

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85119383123&origin=inward
https://hdl.handle.net/11511/97688

Journal

Proceedings of the Institution of Civil Engineers: Water Management

DOI

https://doi.org/10.1680/jwama.20.00071

Collections

Department of Civil Engineering, Article

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Citation Formats

M. Gogus and E. Haspolat, “Effect of sediment properties on incipient motion of large solitary particles on fixed bed,” Proceedings of the Institution of Civil Engineers: Water Management, pp. 0–0, 2021, Accessed: 00, 2022. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85119383123&origin=inward.