Flow, Turbulence, and Resistance in a Flume with Simulated Vegetation

Marcelo Horacio Garcia, Fabián López, Chad Dunn, Carlos V. Alonso

Research output: Chapter in Book/Report/Conference proceedingChapter


Open-channel flow models through vegetative canopies require a quantitative measure of the ability of plants to absorb momentum by form drag, which is commonly characterized in terms of a drag coefficient. An experimental study was performed to investigate the flow structure and drag coefficients in an open channel with both rigid and flexible simulated vegetation under uniform flow conditions. Acoustic Doppler velocimetry was employed to measure three-dimensional velocity components in and above a cylinder canopy. Local values of the drag coefficient were determined from a horizontal momentum balance, which allowed for the first measurements of the vertical variation of the vegetation-induced drag coefficient in open-channel flow. Results show that the drag coefficient is not constant in the vertical, as many models have assumed, but instead, varies throughout the height of the water column.

Original languageEnglish (US)
Title of host publicationRiparian Vegetation and Fluvial Geomorphology
PublisherAmerican Geophysical Union
Number of pages17
ISBN (Print)0875903576, 9780875903576
StatePublished - Mar 19 2013


  • Geomorphology
  • Riparian plants
  • River channels
  • Sediment transport

ASJC Scopus subject areas

  • General Arts and Humanities


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