статья в журнале

Ru

Sovremennye Problemy Distantsionnogo Zondirovaniya Zemli iz Kosmosa

ISSN:20707401

2021

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. © 2021 Space Research Institute of the Russian Academy of Sciences. All rights reserved.

irectional spreading functio, ong wave, emote sensin, esonance scatterin, Sea surfac, lop

2021-05-20 15:25:21