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Bed friction in combined wave-current flows

Simons, R; Myrhaug, D; Thais, L; Chapalain, G; Holmedal, LE; Maciver, R; (2000) Bed friction in combined wave-current flows. In: (pp. pp. 216-226).

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Abstract

Experiments have been performed over a wide range of wave-current combinations in a laboratory flume and a large oscillating water tunnel. Direct measurements of the bed shear stress with a shear cell show that the oscillatory friction factor scales with a/k in the same way irrespective of whether or not a mean current is superimposed. Thus, for a combined wave-current flow over a rough boundary, if the near-bed oscillatory velocity component is known or can be predicted accurately, then the oscillatory component of bottom shear stress can be determined, irrespective of relative current strength, using friction factor formulae developed for wave-alone conditions. Many numerical models tend to overpredict the wave-induced shear stress in combined waves and currents.

Type: Proceedings paper
Title: Bed friction in combined wave-current flows
ISBN: 0784405492
ISBN-13: 9780784405499
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: http://discovery.ucl.ac.uk/id/eprint/130271
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