PIV measurement of coherent flow structure over gravels in a river bed

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Conference Proceeding
Proceedings of the 34th Hydrology and Water Resources Symposium, HWRS 2012, 2012, pp. 1610 - 1617
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© 2012 Engineers Australia. An experimental study of the role of coherent structures and their effect on initiation of sediment particles has been carried out using a laboratory flume. Experiments were conducted under different flow conditions and fixed bed. Spherical gravels with diameter of 65 mm were installed at the bed of flume. The spherical gravels exposed 20 mm above the bed surface. The two dimensional instantaneous flow velocity was measured simultaneously over the gravels using Particle Image Velocimetry (PIV). The PIV advantage is to measure instantaneous information of coherent flow structure in time and space simultaneously. Quadrant analysis of two instantaneous flow structures revealed a dominant sweep event at above the particles whereas inward interactions was found low probable event above the spherical particles. The higher inclination angle was also found for sweep events which are likely to induce higher momentum than other events. The results of this study are useful to define entrainment of sediment particles at the bed of river.
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