A COMPOSITE MODEL OF MICROWAVE SCATTERING FROM WATER SURFACE IN EXTREME WIND SPEED CONDITION

N. S. Rusakov; Русаков Н. С.; G. A. Baydakov; Байдаков Г. А.; Yu. I. Troitskaya; Троицкая Ю. И.

doi:10.31857/S2686739723601710

A COMPOSITE MODEL OF MICROWAVE SCATTERING FROM WATER SURFACE IN EXTREME WIND SPEED CONDITION

Authors: Rusakov N.S.¹, Baydakov G.A.¹, Troitskaya Y.I.¹
Affiliations:
1. Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences
Issue: Vol 513, No 1 (2023)
Pages: 139-145
Section: ФИЗИКА АТМОСФЕРЫ И ГИДРОСФЕРЫ
URL: https://journals.rcsi.science/2686-7397/article/view/232991
DOI: https://doi.org/10.31857/S2686739723601710
EDN: https://elibrary.ru/LNJBDH
ID: 232991

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Abstract
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Abstract

Experiments were carried out in the wind-wave flume of Large Thermo-Stratified Wind-Wave Tank of IAP RAS aimed at studying the mechanisms of cross-polarized microwave radiation scattering from water surface under conditions of extremely high wind speeds. It is shown that the normalized radar cross-section (NRCS) can be represented as the result of an incoherent addition of contributions from breaking wave crests and from non-breaking wind waves. The effect of smoothing the water surface after passing the breaking crest made it possible to measure the NRCS of the breaking area on cross-polarization, while no dependence of the NRCS on wind speed and incidence angle was revealed. NRCS on non-breaking wind waves was calculated within the framework of the small slope approximation (SSA) using experimentally measured wind wave spectra. It is shown that the NRCS on cross-polarization increases monotonically with increasing wind speed, including hurricane conditions. In this case, the contribution of non-breaking wind waves to the NRCS saturates at wind speeds above 25 m/s. The monotonous increasing NRCS at higher wind speeds is associated with a breaking area increasing. A composite model of microwave radiation scattering from wave-covered water surface has been constructed, which has been verified on the basis of comparison with measurement data. The possibility of constructing a geophysical model function for ocean conditions based on the proposed composite model is shown, which can be used for remote sensing of sea storms and hurricanes.

Keywords

microwave scattering, wave breaking, polarized microwave radiation, laboratory modeling, remote sensing, geophysical model function

References

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