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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. 1, pp. 257-269

Model experiments on investigation of the influence of plastic garbage on water surface on the characteristics of Ka-band radar signals

S.A. Ermakov 1, 2 , V.A. Dobrokhotov 1 , G.V. Leshchev 1 , O.A. Danilicheva 1 , L.M. Plotnikov 1 
1 Institute of Applied Physics RAS, Nizhny Novgorod, Russia
2 Volga State University of Water Transport, Nizhny Novgorod, Russia
Accepted: 04.12.2023
DOI: 10.21046/2070-7401-2024-21-1-257-269
The problem of ocean pollution by plastic garbage (PG) and the development of physical principles of its remote sensing, including radar diagnostics, has become extremely important in recent years. In this paper, we present the results of the first special field experiments on studying the influence of PG on the characteristics of microwave radar signals using the example of polyethylene films floating on water surface. Radar sensing was carried out using a Ka-band Doppler scatterometer, installed on a moving small-sized vessel, at moderate microwave incidence angles, at vertical and horizontal polarizations, at some angle to the wind and across the wind. The damping coefficient of wind waves as they pass through the area covered by the film was measured using miniature accelerometers. A significant attenuation (from units to tens of times) of the radar signal intensity in the region of the wave leeward of the film — the PG “trace” effect — was detected, and it was shown that the magnitude of the effect depends on the azimuthal angle at which the sensing is carried out. A qualitative physical explanation of wind wave attenuation on the film and the PG radar trace effect is given.
Keywords: plastic garbage, wind waves, microwave radar probing, polyethylene film, plastic garbage radar trace
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