The effect of sediment-induced stratification in channel bends

Tzu Hao Yeh, Esther Eke, Gary Parker

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Flow containing sediment suspension develops density stratification, due to the tendency for suspended sediment to settle. This damps turbulence and suppresses mixing of momentum and sediment itself. The flow thus has an enhanced velocity gradient and a bias of suspended sediment concentration toward the bed. These tendencies are relevant to bend flow, where suspended sediment is redistributed by secondary flow. This study considers steady, uniform bend flow in a channel with constant width and radius of curvature. The interaction between secondary flow and sediment suspension is examined, as well as the significance of stratification effects. Vertical profiles of velocity and concentration of suspended sediment are solved with the Smith-McLean turbulence closure. The secondary flow structure is then incorporated into the 2D depth-averaged shallow water equations. The level of stratification is characterized by two dimensionless parameters: dimensionless settling velocity and bulk Richardson number.

Original languageEnglish (US)
Title of host publicationWorld Environmental and Water Resources Congress 2011
Subtitle of host publicationBearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress
Pages2360-2369
Number of pages10
DOIs
StatePublished - Jul 21 2011
EventWorld Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Palm Springs, CA, United States
Duration: May 22 2011May 26 2011

Publication series

NameWorld Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress

Other

OtherWorld Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability
CountryUnited States
CityPalm Springs, CA
Period5/22/115/26/11

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Keywords

  • Channels
  • Suspended sediment

ASJC Scopus subject areas

  • Environmental Science(all)

Cite this

Yeh, T. H., Eke, E., & Parker, G. (2011). The effect of sediment-induced stratification in channel bends. In World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress (pp. 2360-2369). (World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress). https://doi.org/10.1061/41173(414)245