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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, 2023, Vol. 20, No. 6, pp. 247-257

Laboratory study of Ka-band radar scattering and wave damping on water covered with plastic film

V.A. Dobrokhotov 1 , S.A. Ermakov 1 , I.A. Sergievskaya 1 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
Accepted: 13.11.2023
DOI: 10.21046/2070-7401-2023-20-6-247-257
Ocean pollution by plastic garbage (PG) and remote diagnostics of the latter is an urgent ecological problem nowadays. Microwave satellite radars play an important role in the development of remote ocean diagnostics methods. This article presents the results of laboratory experiments on studying the effect of polyethylene (PE) films of different thicknesses on gravity-capillary waves (GCW) and on the intensity of microwave radiation reflected from a wavy water surface covered with PE film. It is shown that GCWs are attenuated when passing the region covered with PE film and the attenuation coefficient increases with film thickness. PE film with thicknesses of the order of dozens of microns can be considered as an absolutely non-stretchable elastic film with zero bending tensions. It is found that parasitic capillary ripples and bulge/toe structures, which appear on the profile of large-steepness GCW and represent the main source of scattering of Ka-band radiation, are significantly suppressed by PE films, while the intensity of the radar signal decreases accordingly. Radar scattering in the presence of the film becomes more unpolarized compared to scattering from GCW on clean water.
Keywords: plastic film, gravity-capillary wave, radar scattering, parasitic capillary ripples, bulge/toe structures
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