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

OCEAN ENGINEERING

卷:187

Article

Nieto Borge, Jose Carlos¹  Gerardo Alcazar, Juan¹  Orden, David¹  Marazuela Reca, Sara¹  Rodriguez, Gerardo¹ 

[1] Univ Alcala, Dept Phys & Math, Madrid 28805, Spain

关键词: Wave envelope;    Wave field;    Delaunay triangulation;    Spline methods;   

DOI  :  10.1016/j.oceaneng.2019.106187

来源: Elsevier

【 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.

【 授权许可】

Free