Chapter
Apr 26, 2012
Comparison of Mean Flow and Turbulence around Experimental Spur Dike
Authors: Jennifer G. Duan [email protected]. and Li HeAuthor Affiliations
Publication: World Environmental and Water Resources Congress 2009: Great Rivers
Abstract
An acoustic Doppler velocimeter was used to measure flow and turbulence around an experimental spur dike in a flat and a scoured bed. Differences of mean velocity, turbulent intensity and Reynolds stresses between these two flow fields were compared and analyzed. Upon the formation of scour hole, mean flow velocities in the downstream and lateral directions were reduced, but increased in the vertical direction. The turbulence intensities (u' and v') are much larger, and the vertical component (w') is smaller than that in the flat bed. Bed shear stresses determined from near-bed Reynolds stresses in the scoured bed were smaller than that in the flat bed. These results indicated that local scour has not only significantly reduced bed shear but also contributed to the increase of turbulence intensities in the scouring zone.
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Copyright
© 2009 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
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ASCE Technical Topics:
- Comparative studies
- Engineering fundamentals
- Flow (fluid dynamics)
- Flow measurement
- Fluid dynamics
- Fluid mechanics
- Hydraulic engineering
- Hydraulic structures
- Hydraulics
- Hydrologic engineering
- Levees and dikes
- Measurement (by type)
- Methodology (by type)
- Research methods (by type)
- River and stream beds
- River engineering
- Rivers and streams
- Scour
- Shear stress
- Stress (by type)
- Structural analysis
- Structural engineering
- Turbulence
- Turbulent flow
- Water and water resources
Authors
Affiliations
Assistant Professor, Department of Civil Engineering, University of Arizona, 1209 E. 2nd Street, Tucson, AZ 85721. E-mail: [email protected].
Li He
Visiting Scholar, Department of Civil Engineering and Engineering Mechanics, University of Arizona; formerly, Ph.D. Candidate, State Key Lab of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, P.R. China.
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