Directional Wave Spectra from a Swath Ship at Sea

W. M. Drennan National Water Research Institute, Canada Centre for Inland Waters, Burlington, Ontario, Canada

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M. A. Donelan National Water Research Institute, Canada Centre for Inland Waters, Burlington, Ontario, Canada

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N. Madsen National Water Research Institute, Canada Centre for Inland Waters, Burlington, Ontario, Canada

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K. B. Katsaros Department of Atmospheric Sciences, University of Washington, Seattle, Washington

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E. A. Terray Department of Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts

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C. N. Flagg Brookhaven National Laboratory, Upton, Long Island, New York

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Abstract

During the Surface Wave Dynamics Experiment (SWADE), the swath ship Frederick G. Creed was equipped with an array of wave staffs for the estimation of wave directional spectra. This paper reports on the first such estimates taken from a ship at sea. An algorithm for removing the effects of the ship motion, including those resulting from the Doppler shifting of observed frequencies, is presented along with some results from the SWADE experiment. A comparison with directional wave spectra taken from a nearby buoy shows the fidelity of the method.

Abstract

During the Surface Wave Dynamics Experiment (SWADE), the swath ship Frederick G. Creed was equipped with an array of wave staffs for the estimation of wave directional spectra. This paper reports on the first such estimates taken from a ship at sea. An algorithm for removing the effects of the ship motion, including those resulting from the Doppler shifting of observed frequencies, is presented along with some results from the SWADE experiment. A comparison with directional wave spectra taken from a nearby buoy shows the fidelity of the method.

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