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Progress In Electromagnetics Research
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ELECTROMAGNETIC SCATTERING AND DOPPLER ANALYSIS OF THREE-DIMENSIONAL BREAKING WAVE CRESTS AT LOW-GRAZING ANGLES

By C. Qi, Z. Zhao, W. Yang, Z.-P. Nie, and G. Chen

Full Article PDF (420 KB)

Abstract:
The electromagnetic scattering of the synthesized three-dimensional (3-D) breaking wave crests which are formed by azimuthally aligning the individual 2-D breaking wave profiles has been numerically studied at the low-grazing angles (LGA) by using the multilevel fast multipole algorithm (MLFMA) with adaptive higher order hierarchical Legendre basis functions. Different from the specular (or quasi-specular) reflection and Bragg scattering, the ``sea-spike'' phenomenon which is characterized by that horizontally polarization (HH) signals greatly exceed vertically polarization (VV) signals has been demonstrated by analyzing both the backscattering of 3-D LONGTANK series and a plunging breaker. For the time-dependent evolution of the plunging breaker, the Doppler shifts and Doppler splitting effects are investigated by applying the fast Fourier transform (FFT) with a moving Hamming window. The spectrum of HH scattering has the feature of concentration, while the spectrum of VV scattering shows the Doppler splitting effects.

Citation:
C. Qi, Z. Zhao, W. Yang, Z.-P. Nie, and G. Chen, "Electromagnetic Scattering and Doppler Analysis of Three-Dimensional Breaking Wave Crests at Low-Grazing Angles," Progress In Electromagnetics Research, Vol. 119, 239-252, 2011.
doi:10.2528/PIER11062401
http://www.jpier.org/PIER/pier.php?paper=11062401

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