### Abstract

Lingua originale | English |
---|---|

pagine (da-a) | 1163-1179 |

Numero di pagine | 17 |

Rivista | Environmental Fluid Mechanics |

Volume | 15 |

Stato di pubblicazione | Published - 2015 |

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### All Science Journal Classification (ASJC) codes

- Environmental Chemistry
- Water Science and Technology

### Cita questo

*Environmental Fluid Mechanics*,

*15*, 1163-1179.

**Entropic approach to estimate the mean flow velocity:experimental investigation in laboratory flumes.** / Termini, Donatella; Moramarco, Tommaso.

Risultato della ricerca: Article

*Environmental Fluid Mechanics*, vol. 15, pagg. 1163-1179.

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TY - JOUR

T1 - Entropic approach to estimate the mean flow velocity:experimental investigation in laboratory flumes

AU - Termini, Donatella

AU - Moramarco, Tommaso

PY - 2015

Y1 - 2015

N2 - The paper deals with the linear entropic relationship between the maximum velocity, u max , and the mean flow velocity, u m, through a dimensionless parameter U (M), in open-channel flow. The analysis is conducted with the aid of experimental data collected in straight laboratory flumes under different bed and side-walls roughness conditions. In particular, rough/vegetated beds and smooth/rough side-walls conditions have been investigated. The results show that, in the investigated conditions (with exception of low- submergence vegetated bed— h/k v \2), U (M) can be assumed equal to a value that is very close to that found in natural channels. This demonstrates that U (M) is able to implicitly reflect the different hydraulic behavior which is determined in rough and submerged vegetated beds. Thus, the entropy-based Manning’s roughness formula has been validated and the sensitivity analysis of Manning’s coefficient with the values of y o (location of the zero-velocity plane) has been also performed. It is found that this formula is quite robust to represent the observed flow resistance also in the presence of vegetation.

AB - The paper deals with the linear entropic relationship between the maximum velocity, u max , and the mean flow velocity, u m, through a dimensionless parameter U (M), in open-channel flow. The analysis is conducted with the aid of experimental data collected in straight laboratory flumes under different bed and side-walls roughness conditions. In particular, rough/vegetated beds and smooth/rough side-walls conditions have been investigated. The results show that, in the investigated conditions (with exception of low- submergence vegetated bed— h/k v \2), U (M) can be assumed equal to a value that is very close to that found in natural channels. This demonstrates that U (M) is able to implicitly reflect the different hydraulic behavior which is determined in rough and submerged vegetated beds. Thus, the entropy-based Manning’s roughness formula has been validated and the sensitivity analysis of Manning’s coefficient with the values of y o (location of the zero-velocity plane) has been also performed. It is found that this formula is quite robust to represent the observed flow resistance also in the presence of vegetation.

UR - http://hdl.handle.net/10447/148847

M3 - Article

VL - 15

SP - 1163

EP - 1179

JO - Environmental Fluid Mechanics

JF - Environmental Fluid Mechanics

SN - 1567-7419

ER -