Strong Modulation of Short Wind Waves and Ka-Band Radar Return Due to Internal Waves in the Presence of Surface Films. Theory and Experiment

Author:

Ermakov Stanislav A.,Sergievskaya Irina A.,Kapustin Ivan A.

Abstract

Strong variability of Ka-band radar backscattering from short wind waves on the surface of water covered with surfactant films in the presence of internal waves (IW) was studied in wave tank experiments. It has been demonstrated that modulation of Ka-band radar return due to IW strongly depends on the relationship between the phase velocity of IW and the velocity of drifting surfactant films. An effect of the strong increase in surfactant concentration was revealed in convergent zones, associated with IW orbital velocities in the presence of a “resonance” surface steady current, the velocity of which was close to the IW phase velocity. A phenomenological model of suppression and modulations in the spectrum of small-scale wind waves due to films and IW was elaborated. It has been shown that backscatter modulation could not be explained by the modulation of free (linear) millimeter-scale Bragg waves, but was associated with the modulation of bound (parasitic) capillary ripples generated by longer, cm–dm-scale waves—a “cascade” modulation mechanism. Theoretical analysis based on the developed model was found to be consistent with experiments. Field observations which qualitatively illustrated the effect of strong modulation of Ka-band radar backscatter due to IW in the presence of resonance drift of surfactant films are presented.

Publisher

MDPI AG

Subject

General Earth and Planetary Sciences

Cited by 5 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Characterization of Polarized SAR Scattering of Breaking Waves Caused by Internal Solitary Waves;IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing;2024

2. Remote Sensing Techniques for Detecting Internal Solitary Waves: A comprehensive review and prospects;IEEE Geoscience and Remote Sensing Magazine;2024

3. Simulation for the Electromagnetic Scattering and SAR Image of Multi-Source Ocean Waves;2023 Cross Strait Radio Science and Wireless Technology Conference (CSRSWTC);2023-11-10

4. Laboratory Study of Surfactant Film Compression and Boundary Transformation under the Action of Surface Waves;Fundamental and Applied Hydrophysics;2023-01-08

5. Multi-polarization radar backscatter signatures of internal waves at L-band;International Journal of Remote Sensing;2022-03-19

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