MODELLING MOVEABLE BED ROUGHNESS AND FRICTION FOR SPECTRAL WAVES

L.M. Kaczmarek, J.M. Harris, B.A. O'Connor

Abstract


The present paper is concerned with the simulation of turbulent boundary layer dynamics over a moveable seabed in random waves. A new theoretical approach for the evaluation of moveable bed roughness in spectral waves based on the grain-grain interaction idea is presented and tested against data from the laboratory and field. The new approach is combined with the methodology which assumes that the spectral wave condition can be represented by a monochromatic representative wave. Good results have been obtained, although further testing against data gathered in the North Sea is required.

Keywords


spectral waves; movable bed; bed model; bed roughness; bed friction

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