Abstract
This study investigates the flow in an evolving scour hole downstream of a sluice gate with an apron using particle image velocimetry (PIV). The results clearly depict the sequential appearance of four rollers (large vortices) and the evolving connections between the 1st-order moment (velocity) and the 2nd-order moments (turbulent kinetic energy and Reynolds shear stress), during the three-stage (early, intermediate and equilibrium) scour process. At any scour stage, the velocity profiles on cross-jet sections exhibit global self-similarity, whereas those along the jet centerlines preserve self-similarity local to regions with significant average kinetic energy (AKE). Both the profile of the scour hole and the flow fields share self-similarity in terms of spatial distribution, when normalized with proper length and velocity scales. A substantial portion of energy is transferred from the fluid phase to the sediment phase as one of the primary factors for scour upon the incoming jet impinging on the bed, whereas turbulence is merely a secondary factor.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 146 • Issue 6 • June 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: May 10, 2019
Accepted: Dec 3, 2019
Published online: Mar 27, 2020
Published in print: Jun 1, 2020
Discussion open until: Aug 27, 2020
ASCE Technical Topics:
- Computational fluid dynamics technique
- Engineering fundamentals
- Engineering materials (by type)
- Field tests
- Flow (fluid dynamics)
- Fluid dynamics
- Fluid mechanics
- Fluid velocity
- Gates (hydraulic)
- Hydraulic engineering
- Hydraulic structures
- Hydraulics
- Hydrologic engineering
- Hydromechanics
- Jets (fluid)
- Materials engineering
- Particles
- Scour
- Structural engineering
- Structural members
- Structural systems
- Tests (by type)
- Walls
- Water and water resources
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