Ocean Wave Directional Spectra Estimation from an HF Ocean Radar with a Single Antenna Array: Methodology
Ocean Wave Directional Spectra Estimation from an HF Ocean Radar with a Single Antenna Array: Methodology
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DOI：
10.1175/jtech1836.1
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发表时间：
2006-02
影响因子：
2.2
通讯作者：
Y. Hisaki
中科院分区：
文献类型：
--
作者：
Y. Hisaki
摘要提出了一种利用高频海洋雷达估计海浪方向谱的方法。波谱的控制方程是一阶和二阶雷达截面的积分方程、波能量平衡方程和地面风的连续性方程。源函数的参数化与WAM中的参数化相同。此外，该方法还利用了波谱值在频率和方向上都是光滑的以及传播项较小的约束条件。需要估计的未知数是径向网格上以雷达位置为中心的地面风矢量，以及径向和波频方向网格上的波谱值。控制方程在径向网格和波频方向网格上离散化，转化为非线性最小化问题。同卵双胞胎实验表明，即使在非均匀波中，该方法也能估计波谱和动态外推波谱。
Abstract A method to estimate ocean wave directional spectra using a high-frequency (HF) ocean radar was developed. The governing equations of wave spectra are integral equations of first- and second-order radar cross sections, the wave energy balance equation, and the continuity equation of surface winds. The parameterization of the source function is the same as that in WAM. Furthermore, the method uses the constraints that wave spectral values are smooth in both wave frequency and direction and that the propagation terms are small. The unknowns to be estimated are surface wind vectors at radial grids whose centers are the radar position, and wave spectral values at radial and wave frequency–direction grids. The governing equations are discretized in the radial and wave frequency–direction grids and are converted into a nonlinear minimization problem. Identical twin experiments showed that the present method can estimate wave spectra and dynamically extrapolate wave spectra, even in an inhomogeneous wav...