Calibration of Omnidirectional Wave Height Spectra by SWIM Through a BU-Net
Calibration of Omnidirectional Wave Height Spectra by SWIM Through a BU-Net
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DOI：
10.1109/tgrs.2023.3336847
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发表时间：
2024
影响因子：
8.2
通讯作者：
Hailong Peng;Bo Mu;Danièle Hauser;Xiangjie Li;Hongling Ye;Ping Chen
中科院分区：
文献类型：
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作者：
Hailong Peng;Bo Mu;Danièle Hauser;Xiangjie Li;Hongling Ye;Ping Chen
表面波调查与监测（SWIM）可以提供全局波谱，但在小海况下，低波数寄生峰的存在、冲浪板效应和残余散斑噪声导致SWIM波高谱产品性能下降。为了减少上述因素对SWIM波高谱的影响，本文提出了一种基于BU-Net的卷积神经网络（CNN）方法，在海况（风浪为主/涌浪为主）和海面条件（风速为9 ~ 19 m/s，有效波高（SWH）为0.8 ~ 3.4 ~ 4.2 m）下，利用浮标测量数据校准SWIM全向波高谱。标定结果表明，上述因素对SWIM全向波高谱的影响是可以校正的。校正后的SWIM波束6°、8°和10°与浮标平均全向波高谱的相关系数均大于0.90，峰值波数的相对误差在10%以内。综合能量的相对误差大多小于20%。此外，利用Meteo-France wave Model （MFWAM）再分析数据，验证了SWIM各谱束的光谱积分参数（有效波高$H_{s}$和能量波周期$T_{m-10}$）的性能。验证结果表明，在风浪海况下，修正后的SWIM波束6°（8°，10°）的$H_{s}$和$T_{m-10}$的RMSE分别为0.31 m （0.32, 0.25 m）和0.50 s (0.51, 0.49 s)；膨胀情况下，分别为0.16 m （0.16, 0.13 m）和0.87 s （0.77, 0.72 s）。
Surface waves investigation and monitoring (SWIM) can provide global wave spectra, but under small sea conditions, the presence of parasitic peaks at low wavenumbers, surfboard effects, and residual speckle noise lead to performance degradation of SWIM wave height spectrum products. To reduce the impacts of the above factors on the SWIM wave height spectrum, in this article, a convolution neural network (CNN) method based on BU-Net is proposed for calibrating SWIM omnidirectional wave height spectra with buoy measurements under sea states (wind wave mainly/swell mainly) and sea surface conditions (wind speed from 9 to 19 m/s, and significant wave height (SWH) from 0.8 to 3.4–4.2 m). The calibration results show that the impact of the above factors on the SWIM omnidirectional wave height spectrum can be corrected. The correlation coefficients between the corrected SWIM beams 6°, 8°, and 10° and the buoy mean omnidirectional wave height spectrum are all greater than 0.90, and the relative error of the peak wavenumber is within 10%. The relative error of the integrated energy is mostly less than 20%. In addition, the performance of spectral integration parameters (effective wave height $H_{s}$ , and energy wave period $T_{m-10}$ ) of each spectral beam of SWIM has been verified using Meteo-France WAve Model (MFWAM) reanalysis data. The validation results show that RMSE of $H_{s}$ and $T_{m-10}$ , for the corrected SWIM beam 6° (8°, 10°) under wind wave sea conditions are 0.31 m (0.32, 0.25 m) and 0.50 s (0.51, 0.49 s), respectively; those for swell cases are 0.16 m (0.16, 0.13 m) and 0.87 s (0.77, 0.72 s), respectively.