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Particle velocity and sediment transport at the limit of deposition in sewers

J. J. Ota ; G., Gustavo, S. Perrusquía (Administration och service)
Water Science and Technology (0273-1223). Vol. 67 (2013), 5, p. 959-967.
[Artikel, refereegranskad vetenskaplig]

This paper focuses on the sediment particle while it is transported at the limit of deposition in storm sewers, i.e. as bed load at the limit of concentration that leads to sediment deposition. Although many empirical sediment transport equations are known in the literature, there is only limited knowledge concerning particle velocity. Sediment particle and sphere velocity measurements were carried out in two pipe channels and these results led to the development of a semi-theoretical equation for sediment transport at the limit of deposition in sewers. Even in the transport process without deposition, sediment movement is slower than water velocity and depends on the angle of repose of sediment with a diameter d on the roughness k of the pipe channel. Instead of classical dimensionless bed shear stress psi, a modified dimensionless bed shear stress psi(d/k)(2/3) was suggested, based on the angle of repose and this parameter was proved to be significant for quantifying the transport capacity. The main purpose of this article is to emphasize the importance of careful observation of experiments. Not only number of tests, but physical understanding are essential for better empirical equations.

Nyckelord: angle of repose, limit of deposition, particle velocity, roughness, sediment transport, storm sewer



Denna post skapades 2013-04-22.
CPL Pubid: 175884

 

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Institutioner (Chalmers)

Administration och service

Ämnesområden

Vattenteknik

Chalmers infrastruktur