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首页> 外文期刊>Journal of ocean engineering and marine energy >High waves in Draupner seas—Part 2: Observation and prediction from synthetic radar images
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High waves in Draupner seas—Part 2: Observation and prediction from synthetic radar images

机译：巨浪在Draupner seas-Part 2:观察从合成雷达图像和预测

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摘要

Abstract In Part 1, Van Groesen et al. (J Ocean Eng Mar Energy, 2017), a numerical study of extreme waves in so-called Draupner seas showed that extreme crest heights of 18 m, one-and-a-half times the significant wave height, occur in a time span of 20 min on average in every area less than 1 km $$^2$$ 2 . Such extreme, steep waves are dangerous for ships and offshore structures. In this Part 2, we demonstrate that using synthetic images of an X-band radar such high waves can be predicted around 60 s before their actual appearance. It will be shown that a recent dynamic average and evolution scenario (DAES) that has demonstrated to lead to good reconstruction of the sea from distorted shadowed radar images of synthetic seas with moderate wave heights can also be applied to the high seas using nonlinear evolution codes. Taking at one instant a reconstructed sea state to calculate the nonlinear sea in future times leads to a qualitatively good prediction that can warn ships of freak waves before their appearance.
机译：摘要在第1部分中,海洋Van Groesen et al。(JEng Mar能量,2017),数值研究极端波浪在所谓Draupner海洋极端的波峰高度18米,半倍的有效波高,发生在平均20分钟的时间跨度每个领域都小于1公里$ $ ^ 2 $ $ 2。对船只和极端,陡波危险海上结构物。证明使用合成的图像x波段雷达可以预测这样的巨浪在60年代在他们实际的外观。会显示最近的动态平均和吗场景(拓扑),展示了进化导致好的重建的海扭曲的跟踪雷达图像的合成与温和的浪高也可以申请公海使用非线性进化代码。在一个即时重建海洋状态在未来时期计算非线性海洋导致定性预测,可以好他们之前警告船只的狂浪外观。

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