dc.contributor.author | Hare, Jenna | |
dc.date.accessioned | 2013-07-09T18:55:41Z | |
dc.date.available | 2013-07-09T18:55:41Z | |
dc.date.issued | 2013-07-09 | |
dc.identifier.uri | http://hdl.handle.net/10222/31138 | |
dc.description.abstract | The spatial and temporal structure of the flow, vorticity and stress over equilibrium orbital-scale sand ripples are investigated at turbulence-resolving scales with a wide-band coherent Doppler profiler (MFDop) in an oscillating tray apparatus. The oscillation period and horizontal excursion were 10 s and 0.5 m. Velocity profiles were acquired with 3 mm vertical resolution and at a 42 Hz sampling rate. Ripple wavelength and amplitude were 25 cm and 2.2 cm. The MFDop measurements are used to investigate the development of the lee vortex as a function of phase, and the co-evolution of turbulent kinetic energy, Reynolds stress and turbulence production. Shear stress is determined from the vertically-integrated vorticity equation and using the double-averaging approach. Friction factors obtained from the two methods are comparable and range from 0.1 to 0.2. | en_US |
dc.language.iso | en | en_US |
dc.subject | Physical oceanography | en_US |
dc.subject | Nearshore processes | en_US |
dc.subject | Bedforms | en_US |
dc.subject | Oscillatory bottom boundary layers | en_US |
dc.subject | Bottom shear stress | en_US |
dc.subject | Coherent Doppler | en_US |
dc.subject | Turbulence | en_US |
dc.title | OBSERVATIONS OF THE SPACE-TIME STRUCTURE OF FLOW, VORTICITY AND STRESS OVER ORBITAL-SCALE RIPPLES | en_US |
dc.date.defence | 2013-05-28 | |
dc.contributor.department | Department of Oceanography | en_US |
dc.contributor.degree | Master of Science | en_US |
dc.contributor.external-examiner | Paul Hill | en_US |
dc.contributor.graduate-coordinator | Dan Kelley | en_US |
dc.contributor.thesis-reader | Anthony Bowen | en_US |
dc.contributor.thesis-reader | Stephanie Kienast | en_US |
dc.contributor.thesis-reader | Barry Ruddick | en_US |
dc.contributor.thesis-reader | Len Zedel | en_US |
dc.contributor.thesis-supervisor | Alex Hay | en_US |
dc.contributor.ethics-approval | Not Applicable | en_US |
dc.contributor.manuscripts | Not Applicable | en_US |
dc.contributor.copyright-release | Not Applicable | en_US |