scholarly journals Electromagnetic Scattering Analysis of the Sea Surface with Single Breaking Waves

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jingjing Wang ◽  
Lixin Guo ◽  
Yiwen Wei ◽  
Shuirong Chai ◽  
Ke Li ◽  
...  
Keyword(s):  
Electromagnetic Scattering ◽  
Grazing Angle ◽  
Wave Model ◽  
Breaking Waves ◽  
Sea Surface ◽  
Breaking Wave ◽  
Frequency Method ◽  
Em Scattering ◽  
Rough Sea Surface ◽  
Rough Sea

A new electromagnetic (EM) scattering model of the sea surface with single breaking waves is proposed based on the high-frequency method in this paper. At first, realistic breaking wave sequences are obtained by solving the fluid equations which are simplified. Then, the rough sea surface is established using the linear filtering method. A new wave model is obtained by combining breaking waves with rough sea surface using a 3D coordinate transformation. Finally, the EM scattering features of the sea surface with breaking waves are studied by using shooting and bouncing rays and the physical theory of diffraction (SBR-PTD). It is found that the structure that is similar to a dihedral corner reflector between the breaking wave and rough sea surface exhibits multiple scattering, which leads to the sea-spike phenomenon that the scattering result of horizontal (HH) polarization is larger than that of vertical (VV) polarization, especially at low-grazing-angle (LGA) incidents with upwind. The sea-spike phenomenon is also closely related to the location of strong scattering.

The Study on a New Approximate Method of Computing Electromagnetic Scattering from Multilayer Rough Sea Surfaces

2014 ◽  
Vol 533 ◽  
pp. 268-273
Author(s):  
Jia Sheng Tian ◽  
Wan Pan ◽  
Jian Shi
Keyword(s):  
Electromagnetic Scattering ◽  
Computation Time ◽  
Sea Surface ◽  
Analysis Method ◽  
Large Matrix ◽  
Random Rough Surfaces ◽  
Strong Winds ◽  
Rough Sea Surface ◽  
Rough Sea ◽  
Good Agreement

At high sea states strong winds make the sea surface broken, and become a multilayer-rough sea surface made of a large number of foams and droplets. Similarly, if the sea surface covered by oil and other dirts will also belong to the mutilayer rough sea surfaces of various medium properties. In this paper, applying the Kirchhoff Approximation (KA) and the electromagnetic theory of stratified media, electromagnetic scattering characteristics from a multilayer rough medium surface are calculated. Firstly, a detailed analysis of electromagnetic reflection from multilayer parallel interfaces under different incident angles is carried out. Secondly, combining the preceding two results and courses, electromagnetic scattering from the multilayer random rough surfaces is studied. The computed results are in good agreement with those by using the method of moments (MOM) and reported by some experts. Finally, the random rough sea surface covered by spilling oil or droplets and foams is calculated in detail. Compared with MOM, the new approximate analysis method in the paper can avoid a large matrix inversion, and thus greatly reduce the computation time and improve the computational efficiency.

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