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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2021, Vol. 18, No. 2, pp. 251-257

Determination of the directional spreading function of gravitational-capillary waves based on remote sensing data in the microwave range

A.S. Zapevalov 1 
1 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 09.03.2021
DOI: 10.21046/2070-7401-2021-18-2-251-257
The possibilities and limitations of constructing the directional spreading function of gravitational-capillary waves based on remote sensing data in the microwave range are analyzed. The analysis is carried out within the framework of the two-scale model of resonant (Bragg) scattering of radio waves on a rough surface. The main physical factor that distorts the calculated directional spreading function is the presence of long waves compared to resonant ones. As a result, resonant waves propagate along a curved surface, which, in turn, leads to a change in the local angle of incidence. Numerical estimates of the effects created by long waves were obtained for the case when sounding is carried out in C-band. It is shown that the presence of long waves leads to a more narrowly directed distribution of wave ener­gy than the real distribution of gravitational-capillary waves. This effect is more pronounced when sounding at horizontal polarization than at vertical one. With an increase in the angle of incidence, the influence of long waves on the calculated values of the directional spreading function rapidly decreases. The effect of long waves must be taken into account at medium and high wind speeds.
Keywords: remote sensing, resonance scattering, sea surface, directional spreading function; slope, long waves
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