Shortwave Direction and Spreading Measured with HF Radar

The accuracy of wave direction and spreading at the Bragg-matched wavelength measured with HF radar over a wide range of HF operating frequencies is demonstrated by comparison with buoy data. The agreement for shortwave direction is better than that obtained for wind direction, which has been the mo...

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Bibliographic Details
Published inJournal of atmospheric and oceanic technology Vol. 29; no. 2; pp. 286 - 299
Main Author Wyatt, Lucy R
Format Journal Article
LanguageEnglish
Published Boston American Meteorological Society 01.02.2012
Subjects
Buoy data
Buoys
Coefficients
Dispersions
Estimates
Fourier analysis
HF radar
Low wind speeds
Marine
Mathematical models
Meteorology
Ocean waves
Radar
Radar measurement
Spectrum allocation
Spreading
Wave direction
Wavelength
Wind
Wind direction
Wind speed
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Summary:The accuracy of wave direction and spreading at the Bragg-matched wavelength measured with HF radar over a wide range of HF operating frequencies is demonstrated by comparison with buoy data. The agreement for shortwave direction is better than that obtained for wind direction, which has been the more common application of this measurement, because these waves are not always aligned with the wind direction, particularly in short fetch and low wind speed situations. The method assumes a model of shortwave directionality and the validity of this is explored by using the buoy Fourier coefficients, with inconclusive results. The radar measurements do not use the linear dispersion relationship, but the comparison with buoy data does, and the implications of this are discussed.
Bibliography:ObjectType-Article-1
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ISSN:0739-0572
1520-0426
DOI:10.1175/JTECH-D-11-00096.1