Wind-wave relationship from SEASAT radar altimeter data |
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Authors: | P C Pandey R M Gairola B S Gohil |
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Institution: | (1) Space Applications Centre, 380053 Ahmedabad, India |
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Abstract: | We present a nonlinear relationship between ocean surface wind at 10 m height (U
10
) and significant wave height of wind-generated gravity waves, (H
1/3)gw, over the open oceans using SEASAT radar altimeter data. The data represent a variety of fetches, durations and strength of winds. Concurrent measurement of significant wave height, (H
1/3
), which may contain a measure of swell and U
10
obtained from the processed geophysical data record (GDR) of the SEASAT radar altimeter were used in the analysis. The total wave energy, E
alt, characterised by altimeter H
1/3
measurements was compared with the energy of a fully developed sea, E
fd
derived from U
10
measurements using the Pierson-Moskowitz model. The criteria E
alt E
fd
was used in data selection to minimise the influence of swell. (H
1/3)gw thus obtained was used in a regression in terms of U
10
in a second-degree polynomial. Verification with independent radar altimeter data confirmed the validity of the proposed wind-wave model, which could be used for operational wave forecasting. |
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Keywords: | |
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