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| Titel |
Experimental validation of the linear dispersion relation, application to the interpretation of radar images |
| VerfasserIn |
K. Trulsen, T. M. Arnesen Taklo, J. C. Nieto Borge, H. E. Krogstad |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250066182
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| Zusammenfassung |
| The linear dispersion relation for water surface waves is often taken for
granted for the interpretation of wave measurements. High-resolution
spatiotemporal measurements suitable for direct validation of the linear
dispersion relation are on the other hand rarely available. While the
imaging of the ocean surface with nautical radar does provide the desired
spatiotemporal coverage, the interpretation of the radar images currently
depends on the linear dispersion relation as a prerequisite.
Recently we carried out numerical simulations demonstrating that the
nonlinear evolution of wave fields may render the linear dispersion relation
inadequate for proper interpretation of observations, the reason being that
the necessary domain of simultaneous coverage in space and time would allow
significant nonlinear evolution (Krogstad & Trulsen 2010). We found that
components above the spectral peak can have larger phase and group velocities
than anticipated by linear theory, and the spectrum does not maintain a thin
dispersion surface.
We have tested this numerical prediction with laboratory experiments designed
to give sufficient resolution in space and time to validate the dispersion
relation directly for nonlinear wave fields.
Krogstad, H. E. & Trulsen, K. (2010) Interpretations and observations of
ocean wave spectra. Ocean Dynamics 60:973-991. |
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