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Estimation of directional surface wave spectra from a towed research catamaran

Journal of Atmospheric and Oceanic Technology

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Abstract

During the High-Resolution Remote Sensing Main Experiment (1993), wave height was estimated from a moving catamaran using pitch-rate and roll-rate sensors, a three-axis accelerometer, and a capacitive wave wire. The wave spectrum in the frequency band ranging roughly from 0.08 to 0.3 Hz was verified by independent buoy measurements. To estimate the directional frequency spectrum from a wave-wire array, the Data-Adaptive Spectral Estimator is extended to include the Doppler shifting effects of a moving platform. The method is applied to data obtained from a fixed platform during the Ris?? Air-Sea Experiment (1994) and to data obtained from a moving platform during the Coastal Ocean Processes Experiment (1995). Both results show that the propagation direction of the peak wind waves compares well with the measured wind direction. When swells and local wind waves are not aligned, the method can resolve the difference of propagation directions. Using the fixed platform data a numerical test is conducted that shows that the method is able to distinguish two wave systems propagating at the same frequency but in two different directions.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Estimation of directional surface wave spectra from a towed research catamaran
Series title:
Journal of Atmospheric and Oceanic Technology
Volume
14
Issue:
6
Year Published:
1997
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Atmospheric and Oceanic Technology
First page:
1467
Last page:
1482
Number of Pages:
16