Author(s): Kenneth C. Wilson

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Abstract: For many years it was assumed that mobile beds obey a rough-boundary frictionlaw with equivalent roughness height proportional to particle diameter.However,this assumption is not correct at high shear stress for which bed-load particles travel in a shear layer much thicker than the particlediameter. For such flows,i.e.Shields ordinate above 0.8,it has beendemonstrated that the equivalent roughness height increases in directproportion to the shear stress,and may be very much larger than the particlesize.This friction analysis has recent1y been extended from unidirectionalto oscillatory motion.The present work further extends the oscillatory flowanalysis to incorporate sediment carried by turbulent suspension,comparingthe results to experimental data,

DOI:

Year: 1989