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Title: Organised turbulence over mobile and immobile hydraulically rough boundaries
Author: Leal, J. B.
Ferreira, Rui M. L.
Franca, Mário J.
Cardoso, António H.
Keywords: Turbulent coherent structures
Laser doppler anemometry
Mobile bed
Issue Date: 2009
Publisher: IAHR
Abstract: The present work is aimed at the study of near-bed organised turbulence over mobile and immobile, porous, hydraulically rough boundaries. The bed was permeable and composed of non-cohesive sediments. Two data sets were analysed, characterised by the same u*. The mobile bed data featured generalised sediment transport for all size fractions smaller than the d90. The fixed bed was obtained as result of an armouring process. Comparison of these data sets reveals differences on such parameters of the bursting cycle as the maximum shear stress and the transported momentum. These results point to a reorganization of turbulence, in the near-bed region, when the bed is mobile. The impacts of these reorganization are discussed, namely in what concerns the third order moments of the distributions of the velocity fluctuations.
Description: 33rd IAHR Congress: Water Engineering for a Sustainable Environment
ISBN: 978-94-90365-01-1
Appears in Collections:FCT: DEC - Documentos de conferências internacionais

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