Relations among mean flow, turbulence, and mixing at a small stream confluence

Bruce L. Rhoads, Quinn W. Lewis

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

Abstract

Stream confluences are important locations for mixing in river systems. This study examines the relations among the mean flow, turbulence, and lateral mixing at a small stream confluence. Advective effects associated with secondary motion of the mean flow dominate mixing in the channel downstream of the confluence. Detailed analysis of velocity and turbidity time series at a location corresponding to the time-averaged position of the mixing interface shows that the exact location of the mixing interface is unsteady and dominated by pulses of interacting fluid from each tributary. These pulses of interacting fluid reflect the passage of coherent turbulent structures, generated by lateral shear between the flows, past the point of measurement.

Original languageEnglish (US)
Title of host publicationRiver Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016
EditorsDan Hanes, Marcelo Garcia, George Constantinescu
PublisherCRC Press/Balkema
Pages1633-1639
Number of pages7
ISBN (Print)9781138029132
StatePublished - Jan 1 2016
EventInternational Conference on Fluvial Hydraulics, RIVER FLOW 2016 - St. Louis, United States
Duration: Jul 11 2016Jul 14 2016

Publication series

NameRiver Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016

Other

OtherInternational Conference on Fluvial Hydraulics, RIVER FLOW 2016
CountryUnited States
CitySt. Louis
Period7/11/167/14/16

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Rhoads, B. L., & Lewis, Q. W. (2016). Relations among mean flow, turbulence, and mixing at a small stream confluence. In D. Hanes, M. Garcia, & G. Constantinescu (Eds.), River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016 (pp. 1633-1639). (River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016). CRC Press/Balkema.