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(Article of periodic en Anglais - 2014)

Document title

Experimental investigation of the impacts of coherent flow structures upon turbulence properties in regions of crescentic scour

Authors(s) and Affiliation(s)

MAITY H. (1) ; MAZUMDER B.S. (1) ;
(1) Fluvial Mechanics Lab., Physics and Applied Mathematics Unit, Indian Statistical Inst., Calcutta, INDE

Abstract

The AA. examine the spatial distributions of third-order moments of velocity fluctuations, the turbulent kinetic energy (TKE) fluxes, and the conditional statistics of Reynolds shear stress across the equilibrium crescentic scour structures generated upstream of short horizontal static cylinders. Detailed velocity data were collected using three-dimensional (3D) micro-acoustic Doppler velocimeter (ADV) across and within the equilibrium scour marks. It is revealed that the positive and negative values of third-order moments associated with the level bed surface and the scour holes are directly related to coherent structures. The components of TKE flux are discussed for the near-bed region of the level bed surface and scour holes in relation to sweep–ejection events. Both the ejection and sweep events at near-bed points on the level surface are more important than within the scour region; and in contrast, both events are stronger for the scour marks than the level bed surface at the outer layer. Sweeps dominate over ejections for the scour hole induced by smaller diameter and ejections dominate for larger diameter

Source

Article of periodic

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

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

Millesime : 2014, vol. 39, no8 [pp. 995-1013]

Bibliographic references : 2 p.

Collation : 21 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.3496

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
Refdoc record number (ud4) : 28681993 : Permanent link - XML version
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