Numerical study of electromagnetic scattering from one-dimensional nonlinear fractal sea surface

doi:10.1088/1674-1056/19/2/024101

Abstract In recent years, linear fractal sea surface models have been developed for the sea surface in order to establish an electromagnetic backscattering model. Unfortunately, the sea surface is always nonlinear, particularly at high sea states. We present a nonlinear fractal sea surface model and derive an electromagnetic backscattering model. Using this model, we numerically calculate the normalized radar cross section (NRCS) of a nonlinear sea surface. Comparing the averaged NRCS between linear and nonlinear fractal models, we show that the NRCS of a linear fractal sea surface underestimates the NRCS of the real sea surface, especially for sea states with high fractal dimensions, and for dominant ocean surface gravity waves that are either very short or extremely long.

Keywords: fractals nonlinearities sea surface electromagnetic scattering

Received: 14 May 2009
Revised: 03 July 2009
Accepted manuscript online:

PACS:	92.10.Fj	(Upper ocean and mixed layer processes)
	92.10.Hm	(Ocean waves and oscillations)
	91.50.Iv	(Marine magnetics and electromagnetics)

Fund: Project supported by the National Natural Science Foundation of China (Grant No.~40706058), the National High Technology Research and Development Program of China (Grant No.~2007AA12Z170), the Science-Technology Chenguang Foundation for Young Scientist of Wuhan, China (Grant No.~200850731388) and the wind and waves component of the Canadian Space Agency GRIP Project entitled Building Satellite Data into Fisheries and Oceans Operational Systems.

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Xie Tao(谢涛), He Chao(何超), William Perrie, Kuang Hai-Lan(旷海兰), Zou Guang-Hui(邹光辉), and Chen Wei(陈伟) Numerical study of electromagnetic scattering from one-dimensional nonlinear fractal sea surface 2010 Chin. Phys. B 19 024101

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