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Chin. Phys. B, 2010, Vol. 19(5): 054102    DOI: 10.1088/1674-1056/19/5/054102

Electromagnetic backscattering from freak waves in(1+1)-dimensional deep-water

Xie Tao, Shen Tao, William Perrie, Chen Wei, Kuang Hai-Lan
School of Information Engineering of Wuhan University of Technology, Wuhan 430070, China;Bedford Institute of Oceanography, B2Y 4A2, Dartmouth, NS, Canada
Abstract  To study the electromagnetic (EM) backscatter characteristics of freak waves at moderate incidence angles, we establish an EM backscattering model for freak waves in (1+1)-dimensional deep water. The nonlinear interaction between freak waves and Bragg short waves is considered to be the basic hydrodynamic spectra modulation mechanism in the model. Numerical results suggest that the EM backscattering intensities of freak waves are less than those from the background sea surface at moderate incidence angles. The normalised radar cross sections (NRCSs) from freak waves are highly polarisation dependent, even at low incidence angles, which is different from the situation for normal sea waves; moreover, the NRCS of freak waves is more polarisation dependent than the background sea surface. NRCS discrepancies between freak waves and the background sea surface with using horizontal transmitting horizomtal (HH) polarisation are larger than those with using vertical transmitting vertical (VV) polarisation, at moderate incident angles. NRCS discrepancies between freak waves and background sea surface decreases with the increase of incidence angle, in both HH and VV polarisation radars. As an application, in the synthetic-aperture radar (SAR) imaging of freak waves, we suggest that freak waves should have extremely low backscatter NRCSs for the freak wave facet with the strongest slope. Compared with the background sea surface, the freak waves should be darker in HH polarisation echo images than in VV echo images, in SAR images. Freak waves can be more easily detected from the background sea surface in HH polarisation images than in VV polarisation images. The possibility of detection of freak waves at low incidence angles is much higher than at high incidence angles.
Keywords:  nonlinearities      sea surface      freak wave      electromagnetic backscattering     
Received:  21 August 2009      Published:  15 May 2010
PACS:  92.10.Dh (Deep ocean processes)  
  91.50.Iv (Marine magnetics and electromagnetics)  
  41.20.Jb (Electromagnetic wave propagation; radiowave propagation)  
Fund: Project supported by the National High Technology Research and Development Program of China (Grant No. 2007AA12Z170), the National Natural Science Foundation of China (Grant No. 40706058), 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.

Cite this article: 

Xie Tao, Shen Tao, William Perrie, Chen Wei, Kuang Hai-Lan Electromagnetic backscattering from freak waves in(1+1)-dimensional deep-water 2010 Chin. Phys. B 19 054102

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