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(Article of periodic en Anglais - 2013)

Document title

Shear velocity estimates in rough-bed open-channel flow

Authors(s) and Affiliation(s)

BAGHERIMIYAB F. (1) ; LEMMIN U. (1) ;
(1) ENAC, Ecole Polytechnique Fédérale de lausanne (EPFL), Lausanne, SUISSE

Abstract

The AA. investigate the feasibility of applying 5 standard methods [the logarithmic mean velocity profile, the Reynolds stress profile, the turbulent kinetic energy (TKE) profile, the wall similarity and spectral methods] that were initially developed to estimate shear velocity in smooth bed flow to turbulent flow over a loose bed of coarse gravel under sub-threshold conditions. The analysis is based on quasi-instantaneous three-dimensional (3D) full depth velocity profiles with high spatial and temporal resolution that were measured with an Acoustic Doppler Velocity Profiler (ADVP) in an open channel. The results confirm the importance of detailed velocity profile measurements for the determination of shear velocity in rough-bed flows. Results from all methods fall into a range of 20% variability and no systematic trend between methods was observed. The wall similarity method appears to be a promising tool for estimating shear velocity under rough-bed flow conditions and in field studies where other methods may be difficult to apply

Source

Article of periodic

published at : Earth surface processes and landforms / ISSN 0197-9337 / CODEN ESPLDB

Editor : Wiley, Chichester - ROYAUME-UNI (1981)

Millesime : 2013, vol. 38, no14 [pp. 1714-1724]

Bibliographic references : 1 p.

Collation : 9 fig., 1 tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 17355

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1002/esp.3421

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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