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Synthetic Aperture Observations of Directional Height Spectra for 7 s Ocean Waves

Abstract

Directional wave-height spectra of 7 s period ocean waves in equilibrium with the wind have been measured using Bragg scattering of LORAN-A transmissions and synthetic aperture techniques. The spectra measured have a resolution of approximately 10° and a dynamic range of at least 25 dB. Observations were carried out over an 8 d period in November 1972, during which sea and wind conditions varied slowly over periods of 24 to 48 h. The ratio of mean-square heights of wave propagating directly downwind to those propagating directly upwind is at least 300:1. The directional spectra were extremely broad, with spectral width between 90° and 180°, and varied with the wind.

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TEAGUE, C., TYLER, G., JOY, J. et al. Synthetic Aperture Observations of Directional Height Spectra for 7 s Ocean Waves. Nature Physical Science 244, 98–100 (1973). https://doi.org/10.1038/physci244098a0

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