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Detection of ocean wave groupiness from spaceborne synthetic aperture radar

Nieto-Borge, Jose Carlos and Lehner, Susanne and Niedermeier, Andreas and Schulz-Stellenfleth, Johannes (2004) Detection of ocean wave groupiness from spaceborne synthetic aperture radar. Journal of Geophysical Research, 109 (C7), pp. 1-18. DOI: 10.1029/2004JC002298.

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Abstract

In recent years a number of remote sensing techniques capable to provide two-dimensional information of the sea surface have been applied to describe sea states. This information is obtained from the estimation of the directional wave number spectrum. However, the wave number spectrum is not sufficient for a complete description of sea states. The analysis of some phenomena such as wave grouping, detection of individual waves, maximum wave heights, etc., needs a complementary study, which has been carried out historically in the temporal domain from buoy records. In two dimensions (e.g., the spatial domain), the complementary analysis of those phenomena can be carried out in the spatial domain rather than the temporal domain. In this work, two methods to analyze wave groupiness in the spatial domain from sea surface images are presented: The first method is based on the two-dimensional generalization of the Smoothed Instantaneous Wave Energy History (SIWEH) function, which had been originally developed to analyze wave groupiness for wave elevation time series. The second method uses the estimation of the wave envelope in two dimensions to extract wave grouping parameters. Assuming that the wave fields are Gaussian stochastic processes, both methods are applied to ERS-2 synthetic aperture radar (SAR) and ENVISAT advanced SAR (ASAR) images of the sea surface, where only cases with almost range traveling waves are considered in order to avoid strong nonlinearities in the SAR imaging mechanisms. The obtained results shown that spaceborne SAR can be used to extract wave grouping information on global scale.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2004,
Title:Detection of ocean wave groupiness from spaceborne synthetic aperture radar
Authors:
AuthorsInstitution or Email of Authors
Nieto-Borge, Jose CarlosUNSPECIFIED
Lehner, SusanneUNSPECIFIED
Niedermeier, AndreasUNSPECIFIED
Schulz-Stellenfleth, JohannesUNSPECIFIED
Date:2004
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:109
DOI:10.1029/2004JC002298
Page Range:pp. 1-18
Status:Published
Keywords:SAR; wave grouping; surface waves
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute
Deposited By: elib DLR-Beauftragter
Deposited On:07 Feb 2006
Last Modified:06 Jan 2010 22:26

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