Numerical study of near-bed turbulence structures influence on the initiation of saltating grains movement

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Title:Numerical study of near-bed turbulence structures influence on the initiation of saltating grains movement
Creators:
Bialik, Robert J.; rbialikigf dot edu dot pl; Institute of Geophysics, Polish Academy of Sciences, Ks. Janusza 64, 01-452 Warsaw, Poland.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 61, 3, pp. 202-207
Uncontrolled Keywords:Entrainment, Numerical simulations, Saltation, Sediment transport, Turbulence structures

Abstract

The focus of this paper is on the analysis of the influence of near-bed turbulence structures with the inclusion of existing coherent structures on the entrainment of saltating particles in a water stream from the Lagrangian perspective. The interactions between turbulence structures and initiation of particles movement is the key for better understanding of the physics of sediment transport and particles behaviour. These aims are addressed by use of a 3D relevant model of spherical saltating particles, in which a special procedure has been designed to produce coherent structures. In this method, the spectra of turbulent kinetic energy, consisting of four ranges, are used to generate the time series of turbulent velocities in the streamwise, vertical and transversal directions. Numerical results suggest that the initiation of sediment movement is strongly correlated to positive streamwise velocity fluctuations and as such, supports earlier laboratory experimental and field observations, showing that the sweeps and outward interactions play a crucial role in the initiation of saltating particles’ movement.

Official URL: http://147.213.145.2/vc/vc1.asp

Title:Numerical study of near-bed turbulence structures influence on the initiation of saltating grains movement
Translated title:Numerical study of near-bed turbulence structures influence on the initiation of saltating grains movement
Creators:
Bialik, Robert J.; rbialikigf dot edu dot pl; Institute of Geophysics, Polish Academy of Sciences, Ks. Janusza 64, 01-452 Warsaw, Poland.
Uncontrolled Keywords:Entrainment, Numerical simulations, Saltation, Sediment transport, Turbulence structures
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:61
Number:3
Page Range:pp. 202-207
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8161
Item Type:Article
Deposited On:05 Jun 2014 18:28
Last Modified:05 Jun 2014 16:28

Citation

Bialik, Robert J. (2013) Numerical study of near-bed turbulence structures influence on the initiation of saltating grains movement. Journal of Hydrology and Hydromechanics, 61 (3). pp. 202-207. ISSN 0042-790X

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