| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Electromagnetic backscattering from one-dimensional drifting fractal sea surface I: Wave-current coupled model |
| Tao Xie(谢涛)1,2, Shang-Zhuo Zhao(赵尚卓)1,2, William Perrie3, He Fang(方贺)1,2, Wen-Jin Yu(于文金)1,2, Yi-Jun He(何宜军)1,2 |
1 School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2 Jiangsu Engineering Technology Research Center of Marine Environment Detection, Nanjing 210044, China;
3 Fishreis & Oceans Canada, Bedford Institute of Oceanography, Dartmouth, Nova Scotia, B2Y 4A2 Canada |
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Abstract To study the electromagnetic backscattering from a one-dimensional drifting fractal sea surface, a fractal sea surface wave-current model is derived, based on the mechanism of wave-current interactions. The numerical results show the effect of the ocean current on the wave. Wave amplitude decreases, wavelength and kurtosis of wave height increase, spectrum intensity decreases and shifts towards lower frequencies when the current occurs parallel to the direction of the ocean wave. By comparison, wave amplitude increases, wavelength and kurtosis of wave height decrease, spectrum intensity increases and shifts towards higher frequencies if the current is in the opposite direction to the direction of ocean wave. The wave-current interaction effect of the ocean current is much stronger than that of the nonlinear wave-wave interaction. The kurtosis of the nonlinear fractal ocean surface is larger than that of linear fractal ocean surface. The effect of the current on skewness of the probability distribution function is negligible. Therefore, the ocean wave spectrum is notably changed by the surface current and the change should be detectable in the electromagnetic backscattering signal.
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Received: 20 October 2015
Revised: 12 January 2016
Accepted manuscript online:
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PACS:
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41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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84.40.Xb
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(Telemetry: remote control, remote sensing; radar)
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91.50.Iv
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(Marine magnetics and electromagnetics)
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92.10.Hm
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(Ocean waves and oscillations)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 41276187), the Global Change Research Program of China (Grant No. 2015CB953901), the Priority Academic Development Program of Jiangsu Higher Education Institutions (PAPD), Program for the Innovation Research and Entrepreneurship Team in Jiangsu Province, China, the Canadian Program on Energy Research and Development, and the Canadian World Class Tanker Safety Service. |
Corresponding Authors:
Tao Xie
E-mail: xietao@nuist.edu.cn
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Cite this article:
Tao Xie(谢涛), Shang-Zhuo Zhao(赵尚卓), William Perrie, He Fang(方贺), Wen-Jin Yu(于文金), Yi-Jun He(何宜军) Electromagnetic backscattering from one-dimensional drifting fractal sea surface I: Wave-current coupled model 2016 Chin. Phys. B 25 064101
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