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| Titel |
Influence of wind forcing on evolution and breaking of nonlinear wave groups. |
| VerfasserIn |
Alina Galchenko, Alexander Babanin, Dmitry Chalikov |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250046661
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| Zusammenfassung |
| A numerical and experimental investigation of modulational instability and breaking of
nonlinear wave groups in the presence of wind forcing is reported. A wave group is initially
assigned by a superposition of two sinusoidal signals with close wave numbers: a carrier
wave and a sideband. While propagating, such wave group experiences modulational
instability, when new sidebands appear and develop. Wind forcing is added to the wave
system. Evolution of the wave system is described in terms of distance to breaking and
modulation depth. The wave modulation depth R is a height ratio of the highest Hh
and the lowest Hl waves in the group: R = Hh-Hl. Numerical simulations are
conducted by means of fully-nonlinear Chalikov Sheinin model (Chalikov and Sheinin,
2005).
In our previous research (Galchenko et al, 2010) distance to breaking and modulation
depth were found to depend on initial primary wave steepness and ratio of initial primary
wave steepness and steepness of sideband. In the same research it was experimentally proven
that breaking severity (energy lost in a single breaking event) grows with modulation depth
R. It was also shown that probability of breaking for wave groups with R |
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