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The tomographic particle image velocimetry (tomographic PIV) technique was used to measure the three-dimensional flow field\u00a0(Elsinga et al., 2006)\u00a0and to quantitatively confirm that it matches the target parameters of small-scale eddies in copepod habitats. The tomographic PIV technique reconstructed the volumetric position of small particles suspended in the fluid, the position of which was imaged by collecting scattered laser light via four cameras simultaneously. Particle displacements were calculated via cross-correlation of particle locations in consecutive volumetric reconstructions in order to measure the local three-dimensional velocity vector. Three-dimensional flow measurements were required for this flow since the local velocity vector included three components of motion and the flow field varied in three coordinate directions.<\/p>\n
The tomographic PIV system\u00a0(Murphy et al., 2012)\u00a0used four high-resolution (Phantom v210, 1280\u00a0\u00d7\u00a0800 pixels), cameras to measure flow fields at the scale of the copepod. Images were captured digitally at a rate of 24 frames per second. To resolve the small length scales in this study, a 105 mm focal length lens (Nikon) was used for each camera. Scheimpflug mounts were used to change the orientation of the lens to correct the plane of focus on the cameras\u00a0(Murphy et al., 2012). Orgasol polyamide powder (20 micron diameter; specific weight of 1.03 g cm-3; Arkema group) tracked the fluid motion within the tank. An infrared laser (808 nm wavelength) was used to illuminate the tracer particles. Experiments were performed in a dark room to eliminate any light outside the control volume that could increase the level of error in the flow measurements.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/purl.org\/dc\/terms\/description":[{"@value":"
The data files contain the fluid velocity measurements in the Burgers vortex flow field. Vortex orientations are horizontal and vertical, each with 4 levels of intensity, as indicated via the file name. Data were measured using tomographic particle image velocimetry.<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/www.w3.org\/2000\/01\/rdf-schema#label":[{"@value":"Burgers vortex velocity fields","@type":"xsd:string"}],"http:\/\/ocean-data.org\/schema\/hasProcessingDescription":[{"@value":"
The vortex volume was reconstructed in the DaVis software ( LaVision DaVis 8.4 - LaVision Inc.) using MART algorithms. A three-dimensional cross-correlation technique calculated the velocity field in the vortex by measuring particle displacements in consecutive reconstructed volumes\u00a0(Elsinga et al., 2006).<\/p><\/div>","@type":"rdf:HTML"}],"http:\/\/purl.org\/dc\/terms\/identifier":[{"@value":"834530","@type":"xsd:int"}],"http:\/\/purl.org\/dc\/terms\/title":[{"@value":"Burgers vortex velocity fields"}],"http:\/\/purl.org\/dc\/terms\/date":[{"@value":"2020-12-28T14:06:27-05:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/created":[{"@value":"2020-12-28T14:06:27-05:00","@type":"xsd:dateTime"}],"http:\/\/purl.org\/dc\/terms\/modified":[{"@value":"2023-07-07T16:10:26-04:00","@type":"xsd:dateTime"}],"http:\/\/rdfs.org\/ns\/void#inDataset":[{"@id":"http:\/\/www.bco-dmo.org\/"}],"http:\/\/ocean-data.org\/schema\/namedGraph":[{"@value":"urn:bcodmo:dataset:834530","@type":"xsd:token"}],"http:\/\/ocean-data.org\/schema\/osprey_page":[{"@id":"https:\/\/www.bco-dmo.org\/dataset\/834530"}],"http:\/\/ocean-data.org\/schema\/identifier":[{"@value":"_:Identifier834530"}],"http:\/\/ocean-data.org\/schema\/datasetTitle":[{"@value":"3D velocity fields for the Burger vortex flow treatments","@language":"en-US"}],"http:\/\/ocean-data.org\/schema\/abstract":[{"@value":"A laboratory apparatus was constructed to physically create a Burgers vortex. Fluid motion is induced by co-rotating two disks while simultaneously withdrawing fluid axially through hollow drive shafts. The technique creates a flow pattern that mimics a Burgers vortex with size and strength consistent with dissipative-scale turbulent eddies in the coastal and near-surface zones. Specifically, the radius, circulation, and axial strain rate of the Burgers vortex were specified to match typical dissipative vortices corresponding to four turbulence intensity levels (described by a mean turbulent dissipation rate of 0.002, 0.009, 0.096, and 0.25 cm2s-3, respectively). \r\n\r\nTomographic particle image velocimetry (tomo-PIV) was used to quantify the flow field, calibrate the apparatus, verify that it produces the desired vortex characteristics, and provide a three-dimensional velocity vector field to compare with zooplankton behavioral assays. The apparatus facilitates direct examination of the mechanistic aspects of plankton interaction with a dissipative-scale turbulent eddy. In depth description of the laboratory setting can be found at Webster and Young, 2015, and Elmi et al., 2021.","@language":"en-US"}],"http:\/\/purl.org\/dc\/terms\/rights":[{"@id":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"http:\/\/ocean-data.org\/schema\/deprecated":[{"@value":"false","@type":"xsd:boolean"}],"http:\/\/purl.org\/dc\/terms\/bibliographicCitation":[{"@value":"Webster, D. (2021) 3D velocity fields for the Burger vortex flow treatments. Biological and Chemical Oceanography Data Management Office (BCO-DMO). 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