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It is shown that if the reference level and reference sediment concentration are taken to be dependent on the excess shear bottom stress, all the characteristics of the sediment-stratified bottom logarithmic layer (SSBLL) may be presented as universal functions of three dimensionless parameters: the Rouse number, the relative friction velocity and the dimensionless height. A phase portrait of the sediment stratification influence domain is reconstructed. Unlike the atmospheric surface layer where the influence of thermal stratification makes itself evident only at great heights, in the SSBLL the impact of sediment stratification may be manifested both at great heights and in the vicinity of the bed depending on the values of the Rouse number and relative friction velocity. A comparison with the hypothesis according to which the mixing length is determined only by the eddy size at a given point is carried out. It is found that this hypothesis may produce significant distortions in the vertical structure of the SSBLL.

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Authors: KAGAN B A, P P Shirshov, Institute of Oceanology, Russian Academy of Sciences, St. Petersburg (RU);SCHRIMPF W, JRC Ispra (IT);EIFLER W, JRC Ispra (IT)
Bibliographic Reference: Article: Advances in Geophysical Research (1995)
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