delft hydraulics
CLIENT : Rijkswaterstaat, National Institute for Coastal and Marine Management (RIKZ)
TITLE : Secondary circulation of the flow due to waves and current
ABSTRACT : Previous measurements (e.g., Klopman, 1994) have shown that in the centre-line of the flume the mean horizontal velocity profile in waves fol/owing the current bends back in the upper region of the water column compared to the current alone case. For waves opposing the current the opposite behaviour was found.
In order to explain this behaviour Radder (1994) suggested the Craik-Leibovich
(ell vortex-force
mechanism. This hypothesis was successfully simulated numerically by Van Kester et al. 119961. However, the explanation of the mean horizontal velocity-profile changesby
the CL vortex-force mechanism depends essentially on secondary circulation cells in the transverse cross-section of the flume. To test the existence of these secondary circulation cells in a laboratory wave-current flume, additional measurements have been performed in the present project.It was found that these secondary circulations are clearly present in the flume as well.
REFERENCES: Contract 22970858 d.d. 25 March 1997 IKUST'2000 Programmel
REV ORIGINATOR DATE REMARKS REVIEWED BY APPROVED BY
0 G. Klopman September '97 Draft report M.W.Dingemans T. Schilperoort
1 G. Klopman
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October '97 Final report M.W.Dingemans~
T. SchilperoortlS0:
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KEYWORDISI CONTENTS STATUS
Wave-current interaction TEXT PAGES : 11
0
PRELIMINARYLaboratory measurement TABLES : 6
0
DRAFTCraik-Leibovich vortex force FIGURES : 50
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