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RECONSTRUCTION OF EXTREME EVENTS THROUGH NUMERICAL SIMULATIONS

机译:通过数值模拟重建极端事件

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In this paper some abnormal or rogue wave events registered in the North Sea by means of the surface elevation measurement are reconstructed with numerical models. The time series of surface elevation measured at a single point although providing incomplete information, are used to restore the unidirectional wave dynamics under reasonable assumptions. Different approaches of defining the relation between the surface elevation and the fluid velocity field are considered, and different numerical models are used to simulate the wave dynamics in time and space. It is shown that for some abnormal or rogue wave records the result of the extreme event reconstruction is robust. In particular, the verification of approximate approaches versus the fully nonlinear numerical simulation is performed. At the same time, the reconstructed rogue wave is generally less steep than the measured one. Possible reasons for this discrepancy are suggested.
机译:本文利用数值模型重建了通过表面高度测量在北海记录的一些异常或流浪事件。尽管提供了不完整的信息,但在单个点处测量的表面高程的时间序列可用于在合理的假设下恢复单向波动力学。考虑了定义表面高度和流速场之间关系的不同方法,并使用了不同的数值模型来模拟时空中的波浪动力学。结果表明,对于某些异常或无赖波记录,极端事件重建的结果是可靠的。特别是,执行了近似方法相对于完全非线性数值模拟的验证。同时,重建的流氓波通常不如所测得的那么陡。建议这种差异的可能原因。

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