Extreme wave phenomena in down-stream running modulated waves

Andonowati and Karjanto, N. and Groesen van, E. (2006) Extreme wave phenomena in down-stream running modulated waves. Applied Mathematical Modelling, 31 (7). pp. 1425-1443. ISSN 0307-904X

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Abstract:	Modulational, Benjamin-Feir, instability is studied for the down-stream evolution of surface gravity waves. An explicit solution, the soliton on finite background, of the NLS equation in physical space is used to study various phenomena in detail. It is shown that for sufficiently long modulation lengths, at a unique position where the largest waves appear, phase singularities are present in the time signal. These singularities are related to wave dislocations and lead to a discrimination between successive `extreme¿ waves and much smaller intermittent waves. Energy flow in opposite directions through successive dislocations at which waves merge and split, causes the large amplitude difference. The envelope of the time signal at that point is shown to have a simple phase plane representation, and will be described by a symmetry breaking unfolding of the steady state solutions of NLS. The results are used together with the maximal temporal amplitude MTA, to design a strategy for the generation of extreme (freak, rogue) waves in hydrodynamic laboratories.
Item Type:	Article
Copyright:	© 2006 Elsevier
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Applied Analysis and Mathematical Physics (AAMP)
Link to this item:	http://purl.utwente.nl/publications/57744
Official URL:	http://dx.doi.org/10.1016/j.apm.2006.04.015
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