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Article Dans Une Revue IEEE Transactions on Geoscience and Remote Sensing Année : 1991

A wind-wave tank study of the azimuthal response of aKa-band scatterometer

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Résumé

The azimuthal response of a 36-GHz scatterometer from wind-generated waves in large wave tanks is presented. The radar was operated at an incidence angle of 30° from nadir and with vertical polarization. Measurements were also made of turbulent stress in air flow above the water surface and the cross-wind and along-wind wave slopes. The friction velocity, u*, ranged from 5 to 100 cm/s. For each wind speed, the azimuthal variation of radar cross section is expressed in terms of the classical three-term Fourier cosine series. As the wind speed increases, the azimuthally averaged radar cross section increases, and the upwind-downwind asymmetry decreases, in general agreement with field observations. However, this Ka-band data set reveals that the cross-wind modulation is not a monotonic function of wind speed, but instead it reaches a peak at u* of about 25 cm/s. The wave slope data exhibit exhibit a similar feature in the short wave directional development. Measurements from 35- and 95-m fetches indicate that the azimuthal response of the radar is more directly related to wind stress than wind speed
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Dates et versions

hal-00104449 , version 1 (06-10-2006)

Identifiants

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Jean-Paul Giovanangeli, Larry F. Bliven, O. Le Calve. A wind-wave tank study of the azimuthal response of aKa-band scatterometer. IEEE Transactions on Geoscience and Remote Sensing, 1991, 29, n° 1, pp.143-148. ⟨10.1109/36.103304⟩. ⟨hal-00104449⟩
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