Flow penetration into the canopy of the submerged vegetation: definitions and quantitative estimates

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Abstract

The focus of this study is on the ranges of flow submergence and vegetation density which well exceed the ranges already studied by other researchers. The penetration distance eδ of large-scale turbulence into vegetation canopies has been assessed using vertical distributions of the normal and shear turbulent stresses. Although the estimates of eδ by the suggested methods are interconnected, their values may differ reflecting different aspects of flow-vegetation interactions. The estimates based on the shear stresses ''uw are most closely correlated with those from the profiles of the variance of the longitudinal velocity ''uuand thus can be used when two-component velocity measurements are not possible. The experimental assessment of the influence of characteristic turbulence scales and energy on flow penetra-tion parameters was made using dimensionless numbers characterizing the interplay between depth-scale, canopy-scale, and wake-scale turbulent eddies. The data suggest that there may be mutually opposing ef-fects leading to unexpected behaviors such as the blockage of depth-scale eddies by enhanced wake-scale turbulence.
Original languageEnglish
Title of host publicationProceedings of the International Conference on Fluvial Hydraulics, Braunschweig, Germany, September 08-10, 2010
Subtitle of host publicationRiver flow 2010
EditorsA. Dittrich, Ka. Koll, J. Aberle, P. Geisenhainer
PublisherBundesanstalt für Wasserbau
Pages437-444
Number of pages8
ISBN (Print)9783939230007
Publication statusPublished - Sep 2010
EventInternational Conference on Fluvial Hydraulics (River Flow 2010) - Braunschweig, Germany
Duration: 8 Sep 201010 Sep 2010

Conference

ConferenceInternational Conference on Fluvial Hydraulics (River Flow 2010)
CountryGermany
CityBraunschweig
Period8/09/1010/09/10

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Keywords

  • flow-vegetation interactions
  • penetration depth
  • penetration distance

Cite this

Nikora, N., & Nikora, V. (2010). Flow penetration into the canopy of the submerged vegetation: definitions and quantitative estimates. In A. Dittrich, K. Koll, J. Aberle, & P. Geisenhainer (Eds.), Proceedings of the International Conference on Fluvial Hydraulics, Braunschweig, Germany, September 08-10, 2010 : River flow 2010 (pp. 437-444). Bundesanstalt für Wasserbau.