Sand motion induced by oscillatory flows: Sheet flow and vortex ripples Ribberink, J. S. ; van der Werf, J. J. ; O'Donoghue, T. ; Hassan, W. N. M. Abstract Publication: Journal of Turbulence Pub Date: 2008 DOI: 10.1080/14685240802220009 Bibcode: 2008JTurb...9...20R