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dc.contributor.authorMullarney, Julia C.
dc.contributor.authorHenderson, Stephen M.
dc.coverage.spatialConference held at Santander, Spainen_NZ
dc.date.accessioned2013-01-31T02:15:49Z
dc.date.available2013-01-31T02:15:49Z
dc.date.copyright2012-12-28
dc.date.issued2012
dc.identifier.citationMullarney, J. C., & Henderson, S. M. (2012). Lagrangian measurements of turbulent dissipation over a shallow tidal flat from pulse coherent Acoustic Doppler Profilers. Proceedings of the 33rd International Conference on Coastal Engineering 2012, 33.en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/7129
dc.description.abstractWe present high resolution (25 mm spatial, 8 Hz temporal) profiles of velocity measured over a shallow tidal flat using pulse-coherent Acoustic Doppler Profilers mounted on surface drifters. The use of Lagrangian measurements mitigated the problem of resolving velocity ambiguities, a problem which often limits the application of high-resolution pulse-coherent profilers. Turbulent dissipation rates were estimated from second-order structure functions of measured velocity. Drifters were advected towards, and subsequently trapped on, a convergent surface front which marked the edge of a freshwater plume. Measured dissipation rates increased as a drifter deployed within the plume approached the front. A drifter then propagated with and along the front as the fresh plume spread across the tidal flats. Near-surface turbulent dissipation measured at the front roughly matched a theoretical mean-shear-cubed relationship, whereas dissipation measured in the stratified plume behind the front was suppressed. After removal of estimates affected by surface waves, near-bed dissipation matched the velocity cubed relationship, although scatter was substantial. Dissipation rates appeared to be enhanced when the drifter propagated across small subtidal channels.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherCostal Engineering Research Councilen_NZ
dc.relation.ispartofCoastal Engineering Proceedings
dc.relation.urihttp://journals.tdl.org/icce/index.php/icce/article/view/6864en_NZ
dc.rightsThis work is licensed under a Creative Commons Attribution 3.0 License. http://creativecommons.org/licenses/by/3.0/en_NZ
dc.subjectdriftersen_NZ
dc.subjectturbulent dissipationen_NZ
dc.subjectLagrangian measurementsen_NZ
dc.subjectshallow flowsen_NZ
dc.subjectstructure functionsen_NZ
dc.subjectpulse coherent profilersen_NZ
dc.subjecttidal flatsen_NZ
dc.titleLagrangian measurements of turbulent dissipation over a shallow tidal flat from pulse coherent Acoustic Doppler Profilersen_NZ
dc.typeConference Contributionen_NZ
dc.identifier.doi10.9753/icce.v33.currents.49en_NZ
dc.relation.isPartOfProceedings of 33rd Conference on Coastal Engineeringen_NZ
pubs.begin-page1en_NZ
pubs.elements-id22693
pubs.end-page12en_NZ
pubs.finish-date2012-07-06en_NZ
pubs.start-date2012-07-01en_NZ


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