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Article Type:
Research Article

Directional Wave Spectra from a Swath Ship at Sea

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

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

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

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K. B. KatsarosDepartment of Atmospheric Sciences, University of Washington, Seattle, Washington

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

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C. N. FlaggBrookhaven National Laboratory, Upton, Long Island, New York

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Print Publication:
01 Aug 1994
DOI:
https://doi.org/10.1175/1520-0426(1994)011<1109:DWSFAS>2.0.CO;2
Page(s):
1109–1116
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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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