基于海浪谱分解与重构的资料同化试验

毛科峰; 萧中乐; 宋海波; 钟奕飞

doi:10.3969/j.issn.0253-4193.2016.03.002

基于海浪谱分解与重构的资料同化试验

doi: 10.3969/j.issn.0253-4193.2016.03.002

1.
解放军理工大学气象海洋学院, 江苏南京 211101
2.
解放军 96631部队, 北京 102208
3.
解放军 92721部队, 浙江舟山 316000
4.
解放军 95857部队, 湖南衡阳 421000

基金项目: 江苏省自然科学基金(BK20150711);国家自然科学基金资助项目(11102232)。

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出版历程
- 收稿日期: 2014-12-05
- 修回日期: 2015-04-02

Assimilation experiment based on wave spectrum decomposition and reconstruction

1.
Institute of Meteorology and Oceanography, PLA University of Science and Technology, Nanjing 211101, China
2.
The 96631 Unit of PLA, Beijing 102208, China
3.
The 92721 Unit of PLA, Zhoushan 316000, China
4.
The 95857 Unit of PLA, Hengyang 102208, China

摘要

摘要: 针对有效波高资料提出一种海浪谱分解与重构的资料同化方案:利用历史时段内的有效波高观测资料和模式计算波高场,采用最优插值方法得到分析波高场;在WAVEWATCH-Ⅲ模式的波浪能量密度谱和有效波高分析值之间引入一个变异系数矩阵,描述模式的误差,以此为状态向量构建卡尔曼滤波系统,对分解过的海浪谱进行修正和重构,得到同化后的海浪谱初始场。利用美国阿拉斯加湾北部海域的7个浮标站进行同化和72 h预报试验,对连续1个月的预报结果进行统计表明:采用该同化方案后24 h预报结果的有效波高均方根误差比未同化的结果降低了0.13 m;同化方案对预报效果的影响可持续36 h左右,随着预报时效延长,同化的效果减弱。
- 海浪谱 /
- 有效波高 /
- 同化 /
- WAVEWATCH-Ⅲ模式 /
- 卡尔曼滤波
Abstract: In the near-shore wave forecasting model,the ocean buoy data assimilation method based on wave spectral decomposition and optimization is proposed. The calculated wave energy spectrum before the initial time is studied with orthogonal decomposition,and the result,combined with synchronous buoy observations of significant wave height value is used to construct a Kalman filtering system,and the initial wave energy density spectrum of wave model is revisesd by the multi-time significant wave height value. This method has been applied to 72 h wave forecast experiments with assimilation 7 buoy's significant wave height data in the Gulf of Alaska. One month experiments show that method can improve the forecasts of significant wave height at different degree of different prediction time. The mean square error for 24 h forecast of significant wave height reduces 0.13 m. Meanwhile,the effect of initial field after assimilation to forecast will extend 36 h or so,but the assimilation effect is weakened by extend the prediction time.
- ocean wave spectrum /
- significant wave height /
- assimilation /
- WAVEWATCH-Ⅲ model /
- Kalman filtering

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参考文献(13)

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