Velocity distribution in the roughness layer of rough-bed flows

V.I. Nikora, K. Koll, Ian Kenneth McEwan, S. R. Mclean, A. Ditrich

Research output: Contribution to journalArticle

101 Citations (Scopus)

Abstract

Several models for the vertical distribution of the double-averaged (in time and in the plane parallel to the mean bed) longitudinal velocity in the flow region between roughness troughs and roughness tops are suggested. We found that the same model for velocity distribution may be applicable to a range of flow conditions and roughness types, which share some common features. The suggested models for velocity distribution in the near-bed region are: (1) Constant velocity; (2) exponential velocity distribution; and (3) linear velocity distribution. The measured velocity distributions may be approximated by a single model or by a combination of models depending on roughness geometry and flow conditions. The validity of these models for velocity distribution is supported by laboratory data.

Original languageEnglish
Pages (from-to)1036-1042
Number of pages7
JournalJournal of Hydraulic Engineering
Volume130
Issue number10
DOIs
Publication statusPublished - 2004

Keywords

  • open channel flow
  • turbulent flow
  • velocity distribution
  • roughness
  • channel beds
  • spatially averaged flow
  • open-channel flow
  • vegetation canopies
  • plant canopies
  • turbulence
  • model

Cite this

Velocity distribution in the roughness layer of rough-bed flows. / Nikora, V.I.; Koll, K.; McEwan, Ian Kenneth; Mclean, S. R.; Ditrich, A.

In: Journal of Hydraulic Engineering, Vol. 130, No. 10, 2004, p. 1036-1042.

Research output: Contribution to journalArticle

Nikora, V.I. ; Koll, K. ; McEwan, Ian Kenneth ; Mclean, S. R. ; Ditrich, A. / Velocity distribution in the roughness layer of rough-bed flows. In: Journal of Hydraulic Engineering. 2004 ; Vol. 130, No. 10. pp. 1036-1042.
@article{caf29ffaed004257a1c47b286270cefe,
title = "Velocity distribution in the roughness layer of rough-bed flows",
abstract = "Several models for the vertical distribution of the double-averaged (in time and in the plane parallel to the mean bed) longitudinal velocity in the flow region between roughness troughs and roughness tops are suggested. We found that the same model for velocity distribution may be applicable to a range of flow conditions and roughness types, which share some common features. The suggested models for velocity distribution in the near-bed region are: (1) Constant velocity; (2) exponential velocity distribution; and (3) linear velocity distribution. The measured velocity distributions may be approximated by a single model or by a combination of models depending on roughness geometry and flow conditions. The validity of these models for velocity distribution is supported by laboratory data.",
keywords = "open channel flow, turbulent flow, velocity distribution, roughness, channel beds, spatially averaged flow, open-channel flow, vegetation canopies, plant canopies, turbulence, model",
author = "V.I. Nikora and K. Koll and McEwan, {Ian Kenneth} and Mclean, {S. R.} and A. Ditrich",
year = "2004",
doi = "10.1061/(ASCE)0733-9429(2004)130:10(1036)",
language = "English",
volume = "130",
pages = "1036--1042",
journal = "Journal of Hydraulic Engineering",
issn = "0733-9429",
publisher = "American Society of Civil Engineers (ASCE)",
number = "10",

}

TY - JOUR

T1 - Velocity distribution in the roughness layer of rough-bed flows

AU - Nikora, V.I.

AU - Koll, K.

AU - McEwan, Ian Kenneth

AU - Mclean, S. R.

AU - Ditrich, A.

PY - 2004

Y1 - 2004

N2 - Several models for the vertical distribution of the double-averaged (in time and in the plane parallel to the mean bed) longitudinal velocity in the flow region between roughness troughs and roughness tops are suggested. We found that the same model for velocity distribution may be applicable to a range of flow conditions and roughness types, which share some common features. The suggested models for velocity distribution in the near-bed region are: (1) Constant velocity; (2) exponential velocity distribution; and (3) linear velocity distribution. The measured velocity distributions may be approximated by a single model or by a combination of models depending on roughness geometry and flow conditions. The validity of these models for velocity distribution is supported by laboratory data.

AB - Several models for the vertical distribution of the double-averaged (in time and in the plane parallel to the mean bed) longitudinal velocity in the flow region between roughness troughs and roughness tops are suggested. We found that the same model for velocity distribution may be applicable to a range of flow conditions and roughness types, which share some common features. The suggested models for velocity distribution in the near-bed region are: (1) Constant velocity; (2) exponential velocity distribution; and (3) linear velocity distribution. The measured velocity distributions may be approximated by a single model or by a combination of models depending on roughness geometry and flow conditions. The validity of these models for velocity distribution is supported by laboratory data.

KW - open channel flow

KW - turbulent flow

KW - velocity distribution

KW - roughness

KW - channel beds

KW - spatially averaged flow

KW - open-channel flow

KW - vegetation canopies

KW - plant canopies

KW - turbulence

KW - model

U2 - 10.1061/(ASCE)0733-9429(2004)130:10(1036)

DO - 10.1061/(ASCE)0733-9429(2004)130:10(1036)

M3 - Article

VL - 130

SP - 1036

EP - 1042

JO - Journal of Hydraulic Engineering

JF - Journal of Hydraulic Engineering

SN - 0733-9429

IS - 10

ER -