Transition probability of the coherent turbulent flow around a circular bridge pier

American Society of Civil Engineers (ASCE)
Publication Type:
Conference Proceeding
PROCEEDINGS OF THE 2011 CONGRES - World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability, 2011, pp. 2478 - 2487
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The coherent structure of flow around a single circular bridge pier and its effects on bed scouring pattern is investigated in this study. The bursting events and associated shear stresses play a major role in sediment entrainment from the bed and in particular around a bridge pier. In this study, the three-dimensional velocity of flow was measured at 102 points near the bed of an open channel using Acoustic Doppler Velocity meter (Micro-ADV). The pattern of scouring and bed profile was measured during the experimental test. The three-dimensional analyse of bursting process and Markov process was applied to the velocity data to find the sequential occurrence of bursting events and to recognize the transition probability of internal and external sweep events. The results showed that external sweep event was very effective mechanism for sediment entrainment close around a single circular bridge.
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