Thesis
Observations of three dimensional surfzone eddies
Washington State University
Master of Science (MS), Washington State University
2013
Handle:
https://hdl.handle.net/2376/101900
Abstract
We present measurements of the vertical structure of surfzone eddies (frequencies < 0.01Hz). From 16 Oct to 07 Nov 2011, an array of 12 Acoustic Doppler Profilers (ADPs) measured velocity profiles in 0-6 m water depth on a natural beach near Duck, North Carolina. We present analysis and describe vertical variations in eddy velocity, vertical variability of eddy magnitude, as well as coherence and phase between near-surface and near-bed velocities. Initial observations on the relationship between shear production and eddy energy were also examined. Eddy were found to be increasingly vertically variable during periods of small significant wave heights (Rmax = 2 when Hs = 0.3m). During large wave height periods, which were associated with storm events in the data set, coherence was found to be a maximum (0.8) value, with a phase angle approximately zero during that time. Eddy energy was found to be closely related to shear production activity for the yearday 293 storm, but not the yearday 301-311 storm.
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Details
- Title
- Observations of three dimensional surfzone eddies
- Creators
- Joshua L. Arnold
- Contributors
- Stephen A. Solovitz (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525100201842
- Language
- English
- Resource Type
- Thesis