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SEA STATE STATISTICS AND EXTREME WAVES OBSERVED BY SATELLITE

机译:卫星观测到的海况和极端波浪

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For the design of ships as well as for the investigation of ship accidents it is important to have knowledge about both the two dimensional spectral wave properties as well as extreme value statistics of ocean waves. Although numerical wave models have reached a high level of accuracy, they still have weaknesses with respect to the details of the 2-D wave spectrum. Furthermore standard models like WAM provide estimates of the 2-D wave spectrum, i.e., second order sea state statistics and therefore lack information on individual wave properties and the occurrence of extreme events. In this study the potential of global Synthetic Aperture Radar (SAR) wave mode data acquired by the European satellites ERS-2 and ENVISAT to investigate ship accidents is discussed and compared to altimeter data and ECMWF model results. These data are acquired independent of light and weather conditions on a global scale. A historic data set of ERS-2 wave mode data acquired between 1998 and 2000 is co-located with accidents which occurred during that time. ENVISAT ASAR wave mode data acquired since 2002 are considered, too. Different ocean wave parameters like significant wave height and wave periods are derived from the SAR data. The potential role of the respective wave conditions for some recent accident is discussed in detail. This includes in particular the analysis of cross sea conditions, groupiness and extreme events.
机译:对于船舶的设计以及船舶事故的调查,重要的是要了解二维频谱波特性以及海浪的极值统计信息。尽管数值波模型已经达到了很高的准确性,但是它们在二维波谱的细节方面仍然存在弱点。此外,诸如WAM之类的标准模型还提供了二维波谱的估计,即二阶海况统计,因此缺乏有关单个波属性和极端事件发生的信息。在这项研究中,讨论了由欧洲卫星ERS-2和ENVISAT采集的全球合成孔径雷达(SAR)波模式数据在调查船舶事故中的潜力,并将其与高度计数据和ECMWF模型结果进行了比较。这些数据是在全球范围内独立于光照和天气条件而获取的。 1998年至2000年期间获得的ERS-2波动模式数据的历史数据集与该期间发生的事故共存于一处。还考虑了自2002年以来获得的ENVISAT ASAR波浪模式数据。从SAR数据可以得出不同的海浪参数,例如重要的海浪高度和海浪周期。详细讨论了相应波浪条件对某些近期事故的潜在作用。这尤其包括对跨海条件,群体性和极端事件的分析。

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