Rogue wave events (RWEs), rare uncertainly emerging localized events with extreme amplitudes, widely exist in various nonlinear wave media. Past laboratory studies on RWEs of water surface waves have mainly focused on mechanically excited waves but to a lesser extent on waves solely excited by wind, which also have a large number of degrees of freedom. In this work, we experimentally demonstrate the laboratory observation of RWEs in a wind-driven water surface wave system after the transition to the steady wave turbulent state by increasing averaged wind speed. The spatiotemporal water surface height evolution is measured using diffusive light photography. It is found that RWEs uncertainly emerge in traveling bursts with high frequency large-amplitude fluctuations and irregular burst amplitude. The associated spontaneous slow periodic wave is identified as the resonant slow sloshing wave selected by the water tank with a finite length and spontaneously excited under turbulence. The surface wind speed modulation by the oscillating surface height of the sloshing wave in the small fetch region is proposed as the source for the excitations of sequential large amplitude bursts. The burst envelope shape deterioration through further turbulent wind and water wave interactions as bursts propagate downstream causes the non-Gaussian water surface height histogram with a highly stretched tail, contributed by the uncertain generation of RWEs in irregular bursts in the middle fetch region.
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December 2020
Research Article|
December 22 2020
Rogue waves associated with resonant slow sloshing waves spontaneously excited in wind-driven water wave turbulence Available to Purchase
Ji-Lin Jou (周基霖);
Ji-Lin Jou (周基霖)
Department of Physics and Center for Complex Systems, National Central University
, Jhongli, Taiwan 32001, Republic of China
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Wei-Shuo Lo (羅偉碩);
Wei-Shuo Lo (羅偉碩)
Department of Physics and Center for Complex Systems, National Central University
, Jhongli, Taiwan 32001, Republic of China
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Lin I (伊林)
Lin I (伊林)
a)
Department of Physics and Center for Complex Systems, National Central University
, Jhongli, Taiwan 32001, Republic of China
a)Author to whom correspondence should be addressed: [email protected]
Search for other works by this author on:
Ji-Lin Jou (<span class='lang' lang='zh'>周基霖</span>)
Department of Physics and Center for Complex Systems, National Central University
, Jhongli, Taiwan 32001, Republic of China
Wei-Shuo Lo (<span class='lang' lang='zh'>羅偉碩</span>)
Department of Physics and Center for Complex Systems, National Central University
, Jhongli, Taiwan 32001, Republic of China
Lin I (<span class='lang' lang='zh'>伊林</span>)
a)
Department of Physics and Center for Complex Systems, National Central University
, Jhongli, Taiwan 32001, Republic of China
a)Author to whom correspondence should be addressed: [email protected]
Physics of Fluids 32, 122120 (2020)
Article history
Received:
October 09 2020
Accepted:
December 05 2020
Citation
Ji-Lin Jou, Wei-Shuo Lo, Lin I; Rogue waves associated with resonant slow sloshing waves spontaneously excited in wind-driven water wave turbulence. Physics of Fluids 1 December 2020; 32 (12): 122120. https://doi.org/10.1063/5.0032133
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