Author(s): H. M. Nagy
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Keywords: No Keywords
Abstract: The geometrical characteristics of fully developed sand waves in alluvial channels are analytically investigated. The study is pertained only to dunes and ripples which form ed in the lower flow regime. An endeavour to predict the dimensions of sand waves is made by approximating their shape as a trianguler with long gentle upstream slope and short steep downstream slope. The height and length of sand waves are derived by the use of infinitesimal wave theory and linear stability analysis. The steepness of the sand waves has been calculated with regard to the influence of the param eters which represent the flow, and bed material. In the study, the suspended sediment effect on the wave steepness is extensively studied through a family of curves representing the relationship between the sand waves steepness and the dominant effective parameters. A comparison between the theoretical results and the observed data of other reliable sources is performed and the graphs show a fair agreement. Also, the presented equation for steepness is compared with the reference studies. Finally, the decay process of sand waves is discussed in the light of the exhibited results.
Year: 1993