Secondary currents and flow variability in straight open channels: Implications for stream restoration projects

José F. Rodríguez, Marcelo H. García

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

Abstract

Laboratory experiments have been carried out in order to study secondary circulation and flow variability in straight open channel flows. The experiments represent the initial stage in the restoration of a channelized urban stream in northeastern Illinois. Mean flow and turbulence measurements provide the basis for the study of the effects of projected pool-riffle structures with the objective of increasing variability in the flow patterns. The results allowed for the quantification of hydrodynamic variability in terms of secondary velocities (5% of mean flow velocity), cores of high streamwise velocities (10% higher than surrounding flow) and bed shear stress (20% oscillation with respect to cross sectional averaged value). All these patterns are consistent with results reported in the literature, and provide experimental verification of a simplified model of secondary circulation.

Original languageEnglish (US)
Title of host publication31st IAHR Congress 2005
Subtitle of host publicationWater Engineering for the Future, Choices and Challenges
EditorsJun Byong-Ho, Il Lee Sang, Seo Il Won, Choi Gye-Woon
PublisherKorea Water Resources Association
Pages5257-5268
Number of pages12
ISBN (Electronic)8987898245, 9788987898247
StatePublished - 2005
Event31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges - Seoul, Korea, Republic of
Duration: Sep 11 2005Sep 16 2005

Publication series

Name31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges

Conference

Conference31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges
Country/TerritoryKorea, Republic of
CitySeoul
Period9/11/059/16/05

Keywords

  • Laboratory experiments
  • Secondary circulation
  • Stream restoration
  • Turbulence

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Environmental Science (miscellaneous)
  • Water Science and Technology

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