中国物理B ›› 2006, Vol. 15 ›› Issue (9): 2175-2179.doi: 10.1088/1009-1963/15/9/045

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Microwave backscattering from the sea surface with breaking waves

洪洁莉1, 魏恩泊2, 葛勇2, 刘叶3   

  1. (1)Department of Physical Oceanography, Ocean University of China,Qingdao 266003, China; (2)Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; (3)Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
  • 收稿日期:2005-08-04 修回日期:2006-03-07 出版日期:2006-09-20 发布日期:2006-09-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos 40476062 and 10374026).

Microwave backscattering from the sea surface with breaking waves

Liu Ye(刘叶)a)b), Wei En-Bo(魏恩泊)a)†, Hong Jie-Li(洪洁莉)c), and Ge Yong(葛勇)a)   

  1. a Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; b Graduate School of the Chinese Academy of Sciences, Beijing 100039, China; c Department of Physical Oceanography, Ocean University of China, Qingdao 266003, China
  • Received:2005-08-04 Revised:2006-03-07 Online:2006-09-20 Published:2006-09-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos 40476062 and 10374026).

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摘要： Based on the effective medium approximation theory of composites, the whitecap-covered sea surface is treated as a medium layer of dense seawater droplets and air. Two electromagnetic scattering models of randomly rough surface are applied to the investigation of microwave backscattering of breaking waves driven by strong wind. The shapes of seawater droplets are considered by calculating the effective dielectric constant of the whitecap layer. The responses of seawater droplets shapes, such as sphere and ellipsoid, to the backscattering coefficient are discussed. Numerical results of the models are in good agreement with the experimental measurements of horizontally and vertically polarized backscattering at microwave frequency 13.9GHz and different incidence angles.

关键词: microwave backscattering, effective medium approximation, whitecaps, wave breaking

Abstract: Based on the effective medium approximation theory of composites, the whitecap-covered sea surface is treated as a medium layer of dense seawater droplets and air. Two electromagnetic scattering models of randomly rough surface are applied to the investigation of microwave backscattering of breaking waves driven by strong wind. The shapes of seawater droplets are considered by calculating the effective dielectric constant of the whitecap layer. The responses of seawater droplets shapes, such as sphere and ellipsoid, to the backscattering coefficient are discussed. Numerical results of the models are in good agreement with the experimental measurements of horizontally and vertically polarized backscattering at microwave frequency 13.9GHz and different incidence angles.

Key words: microwave backscattering, effective medium approximation, whitecaps, wave breaking

中图分类号:  (Thin film structure and morphology)

  • 68.55.-a
78.55.Hx (Other solid inorganic materials) 68.55.Ln (Defects and impurities: doping, implantation, distribution, concentration, etc.)