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Boundary Shear Stress Measurements Below Freesurface Standing Waves: Application to Bed Form Processes

Author(s): H. Chanson

Linked Author(s): Hubert Chanson

Keywords: Boundary shear stress; Undular flow; Standing wave; Sediment transport; Bed form; Bed form formation

Abstract: Waters flowing in natural streams and rivers have the ability to scour and to deposit materials, hence to change the bed topography. It is recognised that undular flows have great potential for sediment dispersion. In the present study, a fixed-bed model was used to investigate the spatial variations of boundary shear stress under standing waves (i. e. undular flow). The results (Fig. 5) highlight the threedimensionality of the boundary shear stress distributions. Maximum boundary shear stress are observed under the wave crests and minimum shear stress under the wave troughs. The experimental findings suggest the formation of three-dimensional standing waves bed forms below undular flows. Overall the study emphasises the existence of large boundary shear stress variations below free-surface undulations.

DOI:

Year: 1999

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