Premium
On the dynamics of sediment suspension by residual Reynolds stresses—confirmation of Bagnold's theory
Author(s) -
LEEDER M. R.
Publication year - 1983
Publication title -
sedimentology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.494
H-Index - 108
eISSN - 1365-3091
pISSN - 0037-0746
DOI - 10.1111/j.1365-3091.1983.tb00687.x
Subject(s) - turbulence , geology , suspension (topology) , sediment transport , reynolds stress , shear stress , residual , mechanics , sediment , geotechnical engineering , physics , geomorphology , mathematics , algorithm , homotopy , pure mathematics
Bagnold's dynamic theory for sediment suspension requires that the immersed weight of suspended grains over unit bed area is supported by an upward‐directed residual Reynolds stress, τ yy , arising from asymmetrical shear turbulence. The present paper presents an analysis of previously published turbulence data which confirms the existence of this residual stress and indicates its generation in the lowermost part of the buffer layer of turbulent shear flows. The magnitude of τ yy is estimated as about 0.3τ yx . Calculations from experimental data on suspended fine sand transport over upper phase beds reveals that τ yy , is in approximate equilibrium with the weight stress due to the suspended load.