Experimental study of a coarse-gravel river bed: Elucidating the nearwall and pore-space turbulent flow physics

Taehoon Kim, Gianluca Blois, Jim Best, Kenneth T. Christensen

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

Abstract

High-resolution Particle Image Velocimetry (PIV) measurements were conducted near a highly permeable wall that served as a proxy for a coarse-gravel river bed. The measurements captured both the overlying flow as well as the flow within the permeable wall to explore the near-wall turbulence and the flow interactions across the permeable interface. The permeable wall was formed by two layers of cubically packed spheres cast in a transparent urethane. A novel refractive-index-matching flume was used to gain full optical access to the near-wall and subsurface flow. Results were compared with similar measurements of flow over an impermeable wall with identical roughness topography to highlight the influence of wall permeability on the near-surface flow. Single-point statistics provided a quantitative assessment of the structural modifications imposed by permeability in the near-wall region. An additional PIV experiment captured the subsurface flow within the pore space. The decay of the mean velocity and the turbulent fluctuations reported by earlier studies is observed in the current investigation.

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
Pages950-955
Number of pages6
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

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ASJC Scopus subject areas

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

Cite this

Kim, T., Blois, G., Best, J., & Christensen, K. T. (2016). Experimental study of a coarse-gravel river bed: Elucidating the nearwall and pore-space turbulent flow physics. In D. Hanes, M. Garcia, & G. Constantinescu (Eds.), River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016 (pp. 950-955). (River Flow - Proceedings of the International Conference on Fluvial Hydraulics, RIVER FLOW 2016). CRC Press/Balkema.