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Remote Sens. 2016, 8(9), 764; doi:10.3390/rs8090764

Effect of High-Frequency Sea Waves on Wave Period Retrieval from Radar Altimeter and Buoy Data

1
Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka 8168580, Japan
2
School of Marine Science and Environment Engineering, Dalian Ocean University, Dalian 116023, China
3
Research Institute for Applied Mechanics, Kyushu University, Fukuoka 8168580, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: Raphael M. Kudela, Xiaofeng Li and Prasad S. Thenkabail
Received: 4 July 2016 / Revised: 19 August 2016 / Accepted: 12 September 2016 / Published: 17 September 2016
View Full-Text   |   Download PDF [3002 KB, uploaded 20 September 2016]   |  

Abstract

Wave periods estimated from satellite altimetry data behave differently from those calculated from buoy data, especially in low-wind conditions. In this paper, the geometric mean wave period T a is calculated from buoy data, rather than the commonly used zero-crossing wave period T z . The geometric mean wave period uses the fourth moment of the wave frequency spectrum and is related to the mean-square slope of the sea surface measured using altimeters. The values of T a obtained from buoys and altimeters agree well (root mean square difference: 0.2 s) only when the contribution of high-frequency sea waves is estimated by a wavenumber spectral model to complement the buoy data, because a buoy cannot obtain data from waves having wavelengths that are shorter than the characteristic dimension of the buoy. View Full-Text
Keywords: radar altimeter; buoy; wave period retrieval; high-frequency sea wave; mean square slope radar altimeter; buoy; wave period retrieval; high-frequency sea wave; mean square slope
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, X.; Ichikawa, K. Effect of High-Frequency Sea Waves on Wave Period Retrieval from Radar Altimeter and Buoy Data. Remote Sens. 2016, 8, 764.

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