| 摘要: |
| 在假设海面白帽为球形气泡层的基础上，利用白帽海面的矢量辐射传输方程和随机粗糙面散射模型建立了海面的微波散射模型。辐射传输方程利用迭代法求解，随机粗糙面散射模型采用双尺度散射模型，利用白帽覆盖率的经验公式计算海面的微波散射特性。数值计算结果表明，随着气泡厚度的增加球形气泡散射系数越来越接近球形粒子散射系数；白帽对散射截面的贡献随风速增大而增大；侧风情况比逆风和顺风情况影响均大；水平极化比垂直极化影响大。本模式结果比单一面散射模式结果更加接近实验结果。 |
| 关键词: 海浪 微波散射 随机粗糙面散射 辐射传输方程 |
| DOI：10.11693/hyhz200002010010 |
| 分类号: |
| 基金项目:国家高技术青年基金资助项目，818－Q－06号;中国博士后基金项目 |
附件 |
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| AN OCEAN WAVE MICROWAVE BACKSCATTERING MODEL |
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HE Yi-jun
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Institute of Oceanology, The Chinese Academy of Sciences, Qingdao, 266071
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| Abstract: |
| Assuming that the oceanic whitecap are composed of the globose air bubbles, an ocean wave microwave backscattering model is formulated using the vector radiative transfer equation of the ocean wave with whitecaps and the backscattering model of the random rough surface. The microwave backscattering cross-section from a random tough sea surface is calculated using an empirical formula of oceanic whitecap coverage, the iterative solution of the radiative transfer equation and the two-scale backscattering model of the random rough sea surface. The numerical results show that the backscattering cross-section from the globose air bubble becomes close to that from globose water particle with an increase in the globose air bubble thickness. The effect of the oceanic whitecap on the radar backscattering cross-section increases with increase in the wind speed, and it is larger in the cross-wind direction than in upwind and downwind directions. It is also larger for the HH polarization than for VV polarization. The results obtained from the present method are better than those from a sea surface scattering model, compared with experimental results. |
| Key words: Ocean wave, Microwave scattering, Random rough surface scattering, Radiative transfer equation |
