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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, 2024, Vol. 21, No. 6, pp. 320-330

Laboratory studies of radar scattering from surface waves propagating over a vertical plastic film submerged in water

S.A. Ermakov 1, 2 , V.A. Dobrokhotov 1 , I.A. Sergievskaya 1, 2 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
2 Volga State University of Water Transport, Nizhny Novgorod, Russia
Accepted: 21.11.2024
DOI: 10.21046/2070-7401-2024-21-6-320-330
The scale of growth of plastic garbage in the world’s oceans is increasing every year. Macroplastics have a significant impact on the ecological state of the World Ocean, which makes the problem of plastic ocean pollution diagnostics extremely urgent. In this paper, we investigate the propagation of gravity-capillary waves over vertically arranged polyethylene films in water, and study the characteristics of the radar signal in surface wave scattering in the presence of these vertical films. Laboratory experiments were carried out in a ring wind-wave tank. Surface waves were generated using a mechanical wave maker. The profiles of gravity-capillary waves were recorded using a photograph of the surface illuminated by a knife-shaped laser beam. Polyethylene films with different thicknesses were used. Radar measurements were performed using a Ka-band scatterometer. Backscattering intensity measurements were performed on vertical polarizations of emitted and scattered electromagnetic waves. It is found that the vertical polyethylene film oscillating under the action of gravity-capillary waves excites secondary short capillary waves. This results in the increase of backscatter and reduction of radar Doppler shift. When moving away from the vertical film, the short capillary waves attenuate, and the influence of the film on the radar backscattering decreases.
Keywords: plastic garbage, polyethylene film, radar scattering, gravity-capillary waves
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