This paper presents results of a study of the kinematics of planar oscillatory flow over a rippled sea bed. The flows are mapped using Particle Image Velocimetry (PIV), a flow measurement technique yielding accurate, full field maps of an instantaneous velocity field. The practical implementation of the PIV method for this study is described, and flow maps presented for amplitude of oscillation to ripple length ratios of 0.8, 1.2 and 1.8. The generation of vortices at the ripples and their subsequent trajectories is described. Finally, the vortex strengths for the three flow regimes are investigated.
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