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Estimation of spatio-temporal wave grouping properties using Delaunay triangulation and spline techniques

机译:使用Delaunay三角剖分和样条技术估算时空波分组特性

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摘要

Wave groups can be detected and studied by using the wave envelope. So far, the method used to compute the wave envelope employs the Riesz transform. However, such a technique always produces symmetric envelopes, which is only realistic in the case of linear waves. In this paper we present a new method to compute the wave envelope providing more realistic results. In particular, the method allows to detect non-symmetry in the wave envelope, something useful, for instance, when detecting groups of high waves. The method computes first the local maxima and minima of the sea surface, and then determines the wave envelope by combining discrete methods, namely the use of the Delaunay triangulation, and tensor-product splines. The proposed method has been applied to simulated wave fields, and also to wave elevations data measured by an X-band radar. The obtained results correctly reproduce the behavior of the simulated waves.
机译:通过使用波包络可以检测和研究波组。到目前为止,用于计算波包络的方法采用了Riesz变换。然而,这种技术总是产生对称的包络,这仅在线性波的情况下才是现实的。在本文中,我们提出了一种新的计算波包络的方法,可提供更真实的结果。特别地,该方法允许检测波包络中的非对称性,例如在检测高波组时有用。该方法首先计算海面的局部最大值和最小值,然后通过组合离散方法(即使用Delaunay三角剖分和张量积样条)来确定波包络。所提出的方法已被应用于模拟波场,也被应用于由X波段雷达测量的波高数据。所获得的结果正确地再现了模拟波的行为。

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