PIANC Smart Rivers 2022
Reviewing Presentation documents
Topic:
Inland Navigation Structure
Logistics
River System Management
Smart Shipping
Special Sessions
Waterway Infrastructure
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Angola
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Bermuda
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Albania
Algeria
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Angola
Antigua and Barbuda
Argentina
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Aruba
Australia
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Bahamas
Bahrain
Bangladesh
Belarus
Belgium
Belize
Benin
Bermuda
Bhutan
Bolivia
Bosnia and Barbados
Bosnia and Herzegovina
Botswana
Brazil
British Virgin Islands
Brunei
Bulgaria
Burkina Faso
Burundi
Cambodia
Cameroon
Canada
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Cayman Islands
Central African Republic
Chad
Chile
China
China(Hong Kong)
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Denmark
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Falkland Islands
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Abstract :
*(250~1000 words)
Pipelines are usually buried or half-buried in rivers for oil and gas transmission or cable conduits, but the studies concerning the flow structure around a submerged half-buried pipeline are not available yet. This paper describes the flow characteristics around a half-buried pipeline exposed to different current conditions by flume experiment. Particle Imaging Velocimetry (PIV) technique was used in the experiment to reveal flow field patterns and the turbulent structures around the half-buried pipelines at different Reynolds numbers. The flow structures studied include the streamlines, the average kinetic energy, the vorticities, the Reynolds shear stress, the turbulence intensities, and the turbulence kinetic energy. The experiment results indicate that the vortex at the upstream side of the half-buried pipeline vanishes gradually with increasing Renolds numbers. However, the two vortices at the locations downstream of the half-buried pipeline exist all the time, in which the vortex closed to the downstream of the pipeline becomes unstable, and the vortex at the pipeline wake remains unchanged. Furthermore, the increase of the approaching flow Reynolds number results in the rise of AKE, the vorticities, the Reynolds shear stress, and the TKE of the flow structure at the half-buried pipeline wake. In the meantime, the turbulence intensity at the upstream side of the half-buried pipe near the bed surface strengthens significantly under Reynolds number conditions, which may accelerate the potential scour process in front of the pipeline. The experiment results are expected to enhance the knowledge of the flow patterns and turbulence structure around the submerged half-buried pipelines and facilitate waterway infrastructure assessment and river-crossing pipeline construction design concerning the flow field around the facilities.
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