Turbulent non-uniform flows in straight compound open-channels

Ecoulements turbulents non-uniformes en lit composés droits

Proust, S. ; Fernandes, J.N. ; Peltier, Y. ; Leal, J.B. ; Rivière, N. ; Cardoso, A.H.

Type de document
Article de revue scientifique à comité de lecture
Langue
Anglais
Affiliation de l'auteur
IRSTEA LYON UR HHLY FRA ; LNEC NATIONAL LABORATORY FOR CIVIL ENGINEERING LISBONNE PRT ; IRSTEA LYON UR HHLY FRA ; FACULDADE DE CIENCIAS E TECNOLOGIA NEW UNIVERSITY OF LISBON CAPARICA PRT ; UNIVERSITE DE LYON UMR 5509 LMFA LABORATOIRE DE MECANIQUE DES FLUIDES ET D'ACOUSTIQUE LYON FRA ; UNIVERSIDADE TECNICA DE LISBOA PRT
Année
2013
Résumé / Abstract
This experimental study assesses the effect of non-uniformity of flow on the momentum flux in straight compound channels. Two flumes were used, featuring vertical and sloping banks. Starting with uniform flow condition, various imbalances in the upstream discharge distribution were introduced. This resulted in a time-averaged lateral flow and an advective transport of momentum, which interacted with the shear-layer turbulence generated by the compound geometry. To investigate this interaction, the three contributions to transverse momentum flux (depth-averaged flow, shear-layer turbulence and dispersive term of spanwise velocity) are assessed. The first two contributions were strengthened by the sloping banks, while the third becomes important for the case of the vertical bank. With a lateral flow towards the main channel, the first contribution rises at the expense of the second. With a lateral flow towards the floodplain, the first two contributions have the same order of magnitude, and the Boussinesq approach is invalidated
Source
Journal of Hydraulic Research, vol. 51, num. 6, p. 656 - 667

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