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

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

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

Fingerprint

submerged vegetation
penetration
turbulence
canopy
vegetation
eddy
dimensionless number
submergence
shear stress
vertical distribution
energy

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.

Flow penetration into the canopy of the submerged vegetation : definitions and quantitative estimates. / Nikora, Nina; Nikora, Vladimir.

Proceedings of the International Conference on Fluvial Hydraulics, Braunschweig, Germany, September 08-10, 2010 : River flow 2010. ed. / A. Dittrich; Ka. Koll; J. Aberle; P. Geisenhainer. Bundesanstalt für Wasserbau, 2010. p. 437-444.

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

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. Bundesanstalt für Wasserbau, pp. 437-444, International Conference on Fluvial Hydraulics (River Flow 2010), Braunschweig, Germany, 8/09/10.
Nikora N, Nikora V. Flow penetration into the canopy of the submerged vegetation: definitions and quantitative estimates. In Dittrich A, Koll K, Aberle J, Geisenhainer P, editors, Proceedings of the International Conference on Fluvial Hydraulics, Braunschweig, Germany, September 08-10, 2010 : River flow 2010. Bundesanstalt für Wasserbau. 2010. p. 437-444
Nikora, Nina ; Nikora, Vladimir. / Flow penetration into the canopy of the submerged vegetation : definitions and quantitative estimates. Proceedings of the International Conference on Fluvial Hydraulics, Braunschweig, Germany, September 08-10, 2010 : River flow 2010. editor / A. Dittrich ; Ka. Koll ; J. Aberle ; P. Geisenhainer. Bundesanstalt für Wasserbau, 2010. pp. 437-444
@inproceedings{da07502fa5484c0883a82cd78789c5d3,
title = "Flow penetration into the canopy of the submerged vegetation: definitions and quantitative estimates",
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.",
keywords = "flow-vegetation interactions , penetration depth , penetration distance",
author = "Nina Nikora and Vladimir Nikora",
note = "The work was partly supported by the Leverhulme Trust, Grant F/00152/Z ‘Biophysics of flow-plant interactions in aquatic systems’. The authors are grateful to the following students: G. Clyne, C. Ghirardo, M. Mcconnell, D. Mcmanus, J. Pike, G. Toledano Piriz, M. Witz for helping with labora-tory experiments.",
year = "2010",
month = "9",
language = "English",
isbn = "9783939230007",
pages = "437--444",
editor = "A. Dittrich and Ka. Koll and J. Aberle and P. Geisenhainer",
booktitle = "Proceedings of the International Conference on Fluvial Hydraulics, Braunschweig, Germany, September 08-10, 2010",
publisher = "Bundesanstalt f{\"u}r Wasserbau",

}

TY - GEN

T1 - Flow penetration into the canopy of the submerged vegetation

T2 - definitions and quantitative estimates

AU - Nikora, Nina

AU - Nikora, Vladimir

N1 - The work was partly supported by the Leverhulme Trust, Grant F/00152/Z ‘Biophysics of flow-plant interactions in aquatic systems’. The authors are grateful to the following students: G. Clyne, C. Ghirardo, M. Mcconnell, D. Mcmanus, J. Pike, G. Toledano Piriz, M. Witz for helping with labora-tory experiments.

PY - 2010/9

Y1 - 2010/9

N2 - 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.

AB - 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.

KW - flow-vegetation interactions

KW - penetration depth

KW - penetration distance

M3 - Conference contribution

SN - 9783939230007

SP - 437

EP - 444

BT - Proceedings of the International Conference on Fluvial Hydraulics, Braunschweig, Germany, September 08-10, 2010

A2 - Dittrich, A.

A2 - Koll, Ka.

A2 - Aberle, J.

A2 - Geisenhainer, P.

PB - Bundesanstalt für Wasserbau

ER -