The interaction of a vortex ring with a sloped sediment layer: critical criteria for incipient grain motion
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![FIG. 3. Sequences of measured fluid velocity fields [(a)–(c)] and corresponding sediment velocities [(d)–(f)] obtained atcorresponding dimensionless times during the interaction](https://thumb-us.123doks.com/thumbv2/123dok_us/8711561.383153/8.612.107.490.95.626/sequences-corresponding-sediment-velocities-obtained-atcorresponding-dimensionless-interaction.webp)
![Fig. 4(b)] are caused, primarily, by an azimuthal instability in the form of a sinusoidal pertur-bation of the ring core,27,28 that can develop as the vortex ring propagates through the fluid](https://thumb-us.123doks.com/thumbv2/123dok_us/8711561.383153/9.612.118.494.514.692/primarily-azimuthal-instability-sinusoidal-develop-vortex-propagates-uid.webp)
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