Flow structures and hydrodynamic force during sediment entrainment
An experimental investigation of the role of coherent structures and their effect on hydrodynamic forces responsible for inception of sediment motion has been carried out using a laboratory flume. Two types of experiments, namely, movable and fixed ball, were conducted using spherical roughness elem...
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| Veröffentlicht in: | Water resources research 2011-01, Vol.47 (1), p.n/a |
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| creator | Dwivedi, Ambuj Melville, Bruce W. Shamseldin, Asaad Y. Guha, Tushar K. |
| description | An experimental investigation of the role of coherent structures and their effect on hydrodynamic forces responsible for inception of sediment motion has been carried out using a laboratory flume. Two types of experiments, namely, movable and fixed ball, were conducted using spherical roughness element beds with particle image velocimetry used to measure the instantaneous flow velocity field. Movable ball experiments revealed the predominance of large sweep structures at the instant of entrainment for both shielded and exposed particles. Fixed ball experiments involving simultaneous measurements of hydrodynamic forces and velocity on the particle at entrainment conditions revealed the significance of impulse in initiating sediment entrainment such that an optimum combination of force and duration is required to produce the threshold impulse. Short‐duration lift forces of magnitudes greater than the submerged weight are thought to be responsible for partial lifting of the completely shielded particle. Quadrant analysis and probability distribution function plots of the dominant hydrodynamic force reveal the higher probability of occurrence of high‐magnitude force induced by sweep (Q4) events. |
| doi_str_mv | 10.1029/2010WR009089 |
| format | Article |
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Two types of experiments, namely, movable and fixed ball, were conducted using spherical roughness element beds with particle image velocimetry used to measure the instantaneous flow velocity field. Movable ball experiments revealed the predominance of large sweep structures at the instant of entrainment for both shielded and exposed particles. Fixed ball experiments involving simultaneous measurements of hydrodynamic forces and velocity on the particle at entrainment conditions revealed the significance of impulse in initiating sediment entrainment such that an optimum combination of force and duration is required to produce the threshold impulse. Short‐duration lift forces of magnitudes greater than the submerged weight are thought to be responsible for partial lifting of the completely shielded particle. Quadrant analysis and probability distribution function plots of the dominant hydrodynamic force reveal the higher probability of occurrence of high‐magnitude force induced by sweep (Q4) events.</description><identifier>ISSN: 0043-1397</identifier><identifier>EISSN: 1944-7973</identifier><identifier>DOI: 10.1029/2010WR009089</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Aluminum ; drag ; Entrainment ; Experiments ; flow structure ; Flow velocity ; Geology ; hydrodynamic forces ; Hydrology ; Laboratories ; lift ; Load ; particle entrainment ; Probability distribution ; protrusions ; Sediment transport ; Sediments ; Sensors ; Shear stress ; Spheres ; Strain gauges ; Stream flow ; Table tennis</subject><ispartof>Water resources research, 2011-01, Vol.47 (1), p.n/a</ispartof><rights>Copyright 2011 by the American Geophysical Union.</rights><rights>Copyright 2011 by American Geophysical Union</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a4101-d40d1b246bcc76f8529c773d864f0cfc0805523ec1b567b9064911e2fcc2dbb23</citedby><cites>FETCH-LOGICAL-a4101-d40d1b246bcc76f8529c773d864f0cfc0805523ec1b567b9064911e2fcc2dbb23</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F2010WR009089$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2010WR009089$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,11493,27901,27902,45550,45551,46443,46867</link.rule.ids></links><search><creatorcontrib>Dwivedi, Ambuj</creatorcontrib><creatorcontrib>Melville, Bruce W.</creatorcontrib><creatorcontrib>Shamseldin, Asaad Y.</creatorcontrib><creatorcontrib>Guha, Tushar K.</creatorcontrib><title>Flow structures and hydrodynamic force during sediment entrainment</title><title>Water resources research</title><addtitle>Water Resour. Res</addtitle><description>An experimental investigation of the role of coherent structures and their effect on hydrodynamic forces responsible for inception of sediment motion has been carried out using a laboratory flume. Two types of experiments, namely, movable and fixed ball, were conducted using spherical roughness element beds with particle image velocimetry used to measure the instantaneous flow velocity field. Movable ball experiments revealed the predominance of large sweep structures at the instant of entrainment for both shielded and exposed particles. Fixed ball experiments involving simultaneous measurements of hydrodynamic forces and velocity on the particle at entrainment conditions revealed the significance of impulse in initiating sediment entrainment such that an optimum combination of force and duration is required to produce the threshold impulse. Short‐duration lift forces of magnitudes greater than the submerged weight are thought to be responsible for partial lifting of the completely shielded particle. Quadrant analysis and probability distribution function plots of the dominant hydrodynamic force reveal the higher probability of occurrence of high‐magnitude force induced by sweep (Q4) events.</description><subject>Aluminum</subject><subject>drag</subject><subject>Entrainment</subject><subject>Experiments</subject><subject>flow structure</subject><subject>Flow velocity</subject><subject>Geology</subject><subject>hydrodynamic forces</subject><subject>Hydrology</subject><subject>Laboratories</subject><subject>lift</subject><subject>Load</subject><subject>particle entrainment</subject><subject>Probability distribution</subject><subject>protrusions</subject><subject>Sediment transport</subject><subject>Sediments</subject><subject>Sensors</subject><subject>Shear stress</subject><subject>Spheres</subject><subject>Strain gauges</subject><subject>Stream flow</subject><subject>Table 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| subjects | Aluminum drag Entrainment Experiments flow structure Flow velocity Geology hydrodynamic forces Hydrology Laboratories lift Load particle entrainment Probability distribution protrusions Sediment transport Sediments Sensors Shear stress Spheres Strain gauges Stream flow Table tennis |
| title | Flow structures and hydrodynamic force during sediment entrainment |
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