dc.contributor.author |
Dwivedi, A |
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dc.contributor.author |
Melville, Bruce |
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dc.contributor.author |
Shamseldin, Asaad |
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dc.date.accessioned |
2012-03-07T00:07:30Z |
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dc.date.issued |
2010 |
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dc.identifier.citation |
Journal of Hydraulic Engineering 136(10):756-769 2010 |
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dc.identifier.issn |
0733-9429 |
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dc.identifier.uri |
http://hdl.handle.net/2292/13173 |
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dc.description.abstract |
The objective of this research is to study the relationship between the coherent flow structures and the hydrodynamic forces leading to entrainment of a spherical bed sediment particle for a rough bed uniform turbulent flow. Two types of experiments, namely, movable and fixed balls, were conducted using spherical roughness-element beds with particle image velocimetry to measure the instantaneous flow-velocity field. Miniature piezoelectric pressure sensors were used to capture the instantaneous pressure on the surface of the sphere. Movable ball experiments reveal the predominance of large sweep structures at the instant of entrainment. Fixed ball experiments carried out at entrainment conditions show the importance of both vertical and horizontal pressure gradients on the ball leading to entrainment. Probability distribution function plots of pressures based on quadrant analysis of velocities also reveal the higher probability of occurrence of high magnitude force induced by sweep (Q<sub>4</sub>) events. © 2010 ASCE. |
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dc.publisher |
American Society of Civil Engineers (ASCE) |
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dc.relation.ispartofseries |
Journal of Hydraulic Engineering |
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dc.rights |
Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/0733-9429/ |
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dc.rights.uri |
https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm |
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dc.subject |
Drag |
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dc.subject |
Entrainment |
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dc.subject |
Flow structure |
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dc.subject |
Hydrodynamic forces |
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dc.subject |
Hydrodynamics |
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dc.subject |
Lift |
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dc.subject |
Particle entrainment |
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dc.subject |
Protrusion |
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dc.subject |
Sediment |
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dc.subject |
Bed sediments |
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dc.subject |
Entrainment |
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dc.subject |
Horizontal pressure |
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dc.subject |
Hydrodynamic forces |
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dc.subject |
Instantaneous flow |
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dc.subject |
Particle entrainment |
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dc.subject |
Particle image velocimetries |
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dc.subject |
Piezoelectric pressure sensors |
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dc.subject |
Probability of occurrence |
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dc.subject |
Protrusion |
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dc.subject |
Quadrant analysis |
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dc.subject |
Rough bed |
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dc.subject |
Sediment particles |
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dc.subject |
Velocity field |
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dc.subject |
Distribution functions |
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dc.subject |
Drag |
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dc.subject |
Experiments |
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dc.subject |
Flow structure |
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dc.subject |
Flow visualization |
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dc.subject |
Fluid dynamics |
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dc.subject |
Hydrodynamics |
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dc.subject |
Sedimentology |
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dc.subject |
Spheres |
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dc.subject |
Velocity measurement |
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dc.subject |
Air entrainment |
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dc.subject |
drag |
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dc.subject |
entrainment |
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dc.subject |
flow structure |
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dc.subject |
flow velocity |
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dc.subject |
hydrodynamic force |
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dc.subject |
piezoelectricity |
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dc.subject |
pressure gradient |
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dc.subject |
sediment transport |
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dc.title |
Hydrodynamic forces generated on a spherical sediment particle during entrainment |
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dc.type |
Journal Article |
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dc.identifier.doi |
10.1061/(ASCE)HY.1943-7900.0000247 |
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pubs.issue |
10 |
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pubs.begin-page |
756 |
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pubs.volume |
136 |
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dc.rights.holder |
Copyright: American Society of Civil Engineers (ASCE) |
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pubs.author-url |
http://www.scopus.com/inward/record.url?eid=2-s2.0-77957112481&partnerID=40&md5=1552831b16de20ec9204468ca34e656e |
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pubs.end-page |
769 |
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pubs.publication-status |
Published |
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dc.rights.accessrights |
http://purl.org/eprint/accessRights/RestrictedAccess |
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pubs.subtype |
Article |
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pubs.elements-id |
88337 |
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pubs.org-id |
Engineering |
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pubs.org-id |
Civil and Environmental Eng |
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pubs.record-created-at-source-date |
2010-09-01 |
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