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Open AccessFeature PaperArticle

Investigation of EM Backscattering from Slick-Free and Slick-Covered Sea Surfaces Using the SSA-2 and SAR Images

College of Information Science and Engineering, Ocean University of China, 238 Songling Road, Qingdao 266100, China
Lab-STICC, UMR CNRS 6285, ENSTA Bretagne, 2 rue Francois Verny 29806 Brest CEDEX 9, France
Author to whom correspondence should be addressed.
Remote Sens. 2018, 10(12), 1931;
Received: 30 October 2018 / Revised: 24 November 2018 / Accepted: 27 November 2018 / Published: 1 December 2018
(This article belongs to the Special Issue Radar Remote Sensing of Oceans and Coastal Areas)
This paper is devoted to investigating the electromagnetic (EM) backscattering from slick-free and slick-covered sea surfaces at various bands (L-band, C-band, X-band, and Ku-band) by using the second-order small slope approximation (SSA-2) and the measured synthetic aperture radar (SAR) data. It is known that the impact of slick on sea surface is mainly caused by two factors: the Marangoni damping effect and the reduction of friction velocity. In this work, the influences induced by these two factors on the sea curvature spectrum, the root mean square (RMS) height, the RMS slope, and the autocorrelation function of sea surfaces are studied in detail. Then, the slick-free and slick-covered sea surface profiles are simulated using the Elfouhaily spectrum and the Monte-Carlo model. The SSA-2 with the tapered incident wave is employed to simulate the normalized radar cross-sections (NRCSs) of sea surfaces. Furthermore, for slick-free sea surfaces, the NRCSs simulated with the SSA-2 at various bands are compared with those obtained by the first-order small slope approximation (SSA-1), the classic two-scale model (TSM), and the geophysical model functions (GMFs) at various bands, respectively. For slick-covered sea surfaces, the SSA-2-simulated NRCSs are compared with those obtained from C-band Radarsat-2 images and L-band uninhabited aerial vehicle synthetic aperture radar (UAVSAR) images, respectively. The numerical simulations illustrate that the SSA-2 can be used to study the EM backscattering from slick-free and slick-covered sea surfaces, and it has more advantages than the SSA-1 and the TSM. The works presented in this paper are helpful for understanding the EM scattering from the sea surface covered with slick, in theory. View Full-Text
Keywords: ocean remote sensing; EM scattering; sea surface; SAR; SSA-2; GMF; NRCS ocean remote sensing; EM scattering; sea surface; SAR; SSA-2; GMF; NRCS
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Zheng, H.; Zhang, Y.; Khenchaf, A.; Wang, Y.; Ghanmi, H.; Zhao, C. Investigation of EM Backscattering from Slick-Free and Slick-Covered Sea Surfaces Using the SSA-2 and SAR Images. Remote Sens. 2018, 10, 1931.

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