The effect of the spatially inhomogeneous wind field on the wave spectra employing an ERS-2 SAR PRI image

Violante-Carvalho, Nelson; Robinson, Ian; Gommenginger, Christine; Mariano Carvalho, Luiz; Ocampo-Torres, Francisco. 2012 The effect of the spatially inhomogeneous wind field on the wave spectra employing an ERS-2 SAR PRI image. Continental Shelf Research, 36. 1-7. 10.1016/j.csr.2011.12.006

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Using wave spectra extracted from image mode ERS-2 SAR scenes, the spatial homogeneity of the wave field in deep water is investigated. From the 100×100 km image, several small images of 6.4×6.4 km are selected and the wave spectra are computed. The locally disturbed wind velocity pattern, caused by the sheltering effect of large mountains near the coast, translates into the selected SAR image as regions of higher and lower wind speed. Assuming that the swell field is uniform over the whole image, SAR derived swell spectra retrieved from the sheltered and non-sheltered areas are intercompared. Any difference between them could be related to a possible modification associated with the sheltering effect on the wind speed and/or a possible interaction between wind sea and swell, since the wind sea part of the spectrum would be slightly different due to the different wind speeds. The results show that there is no significant modification, and apparently there is no clear difference in the swell spectra despite the different wind sea components and wind speeds.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.csr.2011.12.006
Programmes: NOC Programmes
ISSN: 02784343
Additional Keywords: SAR wave spectra; ERS-1&2 SAR precision image; Interaction between wind sea and swell
Date made live: 03 Apr 2012 12:33 +0 (UTC)

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