### 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 language | English |
---|---|

Pages (from-to) | 1036-1042 |

Number of pages | 7 |

Journal | Journal of Hydraulic Engineering |

Volume | 130 |

Issue number | 10 |

DOIs | |

Publication status | Published - 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

*Journal of Hydraulic Engineering*,

*130*(10), 1036-1042. https://doi.org/10.1061/(ASCE)0733-9429(2004)130:10(1036)

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

Research output: Contribution to journal › Article

*Journal of Hydraulic Engineering*, vol. 130, no. 10, pp. 1036-1042. https://doi.org/10.1061/(ASCE)0733-9429(2004)130:10(1036)

}

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 -