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A Method of Swell-Wave Parameter Extraction From HF Ocean Surface Radar Spectra

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3 Author(s)
Bathgate, J.S. ; Math. & Phys. Sci., James Cook Univ. of North Queensland, Townsville, Qld. ; Heron, M.L. ; Prytz, A.

A new method for the extraction of swell-wave parameters from high-frequency (HF) radar spectra is presented. The method of extraction of the parameters, period, direction, and height, relies on a frequency-modulation approach that describes the hydrodynamic interaction of the swell waves with the resonant, shorter, Bragg waves. The analysis process minimizes the electromagnetic second-order interaction and a simulation model was used to validate the approach. This simplified method provides a fast means of examining swell conditions over large areas of the ocean surface. Data are acquired using a pair of coastal ocean surface radar (COSRAD) systems deployed at Tweed Heads, Qld., Australia. The radar covers a sweep (approximately 60deg) every 30 min with spatial resolution of the order of 3 km. A sample set of data from this deployment is used in a case study to show the extraction of swell direction and amplitude using these methods. The results support the use of the COSRAD HF radar for mapping swell in the near-shore zone

Published in:

Oceanic Engineering, IEEE Journal of  (Volume:31 ,  Issue: 4 )