基于X波段海洋雷达的风浪联合反演方法研究

Research on the Wind-Wave Synergistic Retrieval Method Based on X-Band Marine Radar Observations

提出了一种新的利用X波段海洋雷达联合反演海面风速与海浪谱的方法,该方法不需要额外的信息输入来反演海浪谱。通过利用风速与雷达后向散射强度的经验关系获得海表风速,然后将反演的风速输入风浪谱,通过求解该模拟风浪谱与雷达观测图像谱的约束函数的最小值来确定海浪谱。利用实验数据对反演方法进行了验证,风速、有效波高、主波周期以及主波波向反演的均方根误差分别为1.9 m/s,0.4 m,1.2 s和9.6°,证明了该方法的可行性。

This paper presents a new method for synergistic retrieval of ocean surface wind speeds and wave spectrum based on X-band marine radar observations. The proposed algorithm needs not any external data source to obtain wave information. The surface wind speeds are first estimated based on an empirical relationship between the wind speed and radar scattering intensity. Subsequently, the ocean surface wave spectrum is retrieved by minimizing the constraint function including the simulated wave spectrum and observed radar image spectrum. The retrieved wind and wave parameters are compared with those measured by anemometers and buoys.The root mean square error（RMSE） of wind speed, significant wave height, and dominant wave period and wave direction is 1.9 m/s, 0.4 m, 1.2 s and 9.6°, respectively.