On the dynamics of sediment suspension by residual Reynolds stresses—confirmation of Bagnold's theory |
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| Authors: | M R LEEDER |
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| Institution: | Department of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK. |
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| Abstract: | ABSTRACT 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, τyy, 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 τyy is estimated as about 0.3τyx. Calculations from experimental data on suspended fine sand transport over upper phase beds reveals that τyy, is in approximate equilibrium with the weight stress due to the suspended load. |
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