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. 2024 Oct 29;14:25902. doi: 10.1038/s41598-024-74332-5

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.

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Fig. 2 — Microwave backscattering at Hs = 9 cm for a concentration of 10 g/m² and a microwave frequency range between 2–20 GHz (S to K-bands) at VV polarization for (a) 5 cm length foam cylinders, (b) plastic bottles, (c) plastic spheres. The red lines in the graphs represents the theoretical Stokes drift velocity of 1.2 cm/s for a mean wave height of 5.8 cm (equals Hs = 9 cm). Because the slope of the backscattering trails in panel (b) is lower than the theoretical Stokes drift velocity, the plastic bottles appear to be drifting slower than the foam cylinders (a) and the spheres (c).