Critical Shear Stress of Armour Coatby M. B. E. A. Saad, Hydraulics & Sediment Research, Inst, Egypt,
Abstract: The problem of the determination of the critical shear stress of the armour coat is important in sediment transport, river degradation and aggradation and flow discharge regulation. The critical shear stress is considered to be the bottom shear stress which forms the armour coat. Six different log normal grain size distributions were tested in a laboratory flume at 16 different runs. The Shield's diagram for the armour coat has been developed to be used for determining the Shield's parameter of the armour coat. J. Gessler's criteria for the initiation of motion of the bed sediment mixtures gave reasonable prediction but needs to be improved.
Subject Headings: Shear stress | Sediment transport | Shear flow | Critical flow | River flow | Fluid flow | Motion (dynamics) | Water flow
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