Application of the Wigner–Ville Distribution to Temperature Gradient Microstructure: A New Technique to Study Small-Scale Variations
- Creators
- Imberger, Jörg
- Boashash, Boualem
Abstract
The Wigner–Ville distribution, a new tool in the time–frequency analysis of signals, is applied to temperature gradient microstructure records. In particular, the Wigner–Ville distribution is used to compute the local instantaneous and maximum frequencies of the signal as a function of depth, and these frequencies are then related to the dissipation of turbulent kinetic energy. The method is applied to two temperature gradient microstructure records from the Wellington Reservoir. It is shown that a high resolution estimate of the dissipation is obtained that provides insight into the patchiness, the wavenumber content, and the Reynolds–Froude number variability of the integral scales of motion in a strongly stratified water column.
Additional Information
© 1986 American Metereological Society. Received: 15 July 1985. Final Form: 22 April 1986. Published online: 1 December 1986. The authors would like to thank Geoff Prince for implementing the code and David Pullin for carrying out much of the data processing. Geoffery Carter, George Scolaro and David Elford designed and constructed the new microstructure vehicle. Robert Street, Richard Chapman and Stephen Monismith provided useful criticism of an early draft. Tom Dillon provided numerous suggestions, which led to a much improved manuscript. This work was supported by the Australian Special Research Centre Grants Scheme and the Centre for Environmental Dynamics. This article has Environmental Dynamics Ref. No. ED-8S-112 and Electrical Engineering Ref. No. P393. The first author would also like to register the hospitality of Caltech as well as the financial support of the Sherman Fairchild program.Attached Files
Published - 1520-0485_281986_29016_1997_3Aaotwdt_2.0.co_3B2.pdf
Files
| Name | Size | Download all |
|---|---|---|
|
md5:36c67c95e0f00b7ffb5641bae484005f
|
1.1 MB | Preview Download |
Additional details
- Eprint ID
- 85251
- Resolver ID
- CaltechAUTHORS:20180312-132923683
- Australian Special Research Centre Grants Scheme
- Sherman Fairchild Foundation
- Created
-
2018-03-12Created from EPrint's datestamp field
- Updated
-
2021-11-15Created from EPrint's last_modified field