ON THE GEOMETRICALLY SIMILAR REPRODUCTION OF DUNES IN A TIDAL MODEL WITH MOVABLE BED

M.S. Yalin

Abstract


A model design method is suggested which is based on the principles of the theory of dimensions and which is evaluated by experimental relations for the geometric properties of dunes. The model is distorted and, in general, non Froudian. The geometrically similar model dunes are reduced in vertical model scale. The scale of the flow velocity is derived from a generalised friction equation which takes into account the influence of both skin friction and form drag. The application of the method is illustrated by a numerical example. This example indicates that a practicable set of scales is obtained if the model bed is formed by a light weight material.

Keywords


moveable bed; tidal model; dune; dune construction

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