PIV measurements of coherent turbulent flow structure and bursting process around a scour hole

Publisher:
Taylor & Francis Group
Publication Type:
Conference Proceeding
Citation:
PROCEEDINGS OF THE 12'" INTERNATIONAL SYMPOSIUM ON RIVER SEDIMENTATION, ISRS - Advances in River Sediment Research, 2013, pp. 1093 - 1100
Issue Date:
2013-01
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The results of a series of experimental tests related to the flow characteristics in a scouring hole are presented in this paper. The experimental tests were carried out for five different stages of development of a scour hole. These stages are defined on the basis of experimental observation. The mechanisms of the development of the scour hole and flow characteristics were investigated in this study. The flow velocities were measured using Particle Image Velocimetry to characterize the mean velocity field and turbulent characteristics of flow in the scour hole. The measurements reveal a good understanding of the flow characteristics and bursting process and a strong recirculation in the hole. The results showed that upstream of the orifice, the transition probabilities of the stable events were higher than other transition probabilities. Therefore, the events of P11, P22, P33 and P44 were dominant when compared to others. This can be interpreted as an expectation that entrainment should occur at this location. These expectations are consistent with scour hole development and were confirmed by measuring scour hole depth upstream of the orifice.
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