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| Titel |
Experimental and numerical study of spatial and temporal evolution of nonlinear wave groups |
| VerfasserIn |
L. Shemer, B. Dorfman |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 15, no. 6 ; Nr. 15, no. 6 (2008-12-08), S.931-942 |
| Datensatznummer |
250012809
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| Publikation (Nr.) |
 copernicus.org/npg-15-931-2008.pdf |
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| Zusammenfassung |
| The evolution along the tank of unidirectional nonlinear wave groups with
narrow spectrum is studied both experimentally and numerically. Measurements
of the instantaneous surface elevation within the tank are carried out using
digital processing of video-recorded sequences of images of the contact line
movement at the tank side wall. The accuracy of the video-derived results is
verified by measurements performed by conventional resistance-type wave
gauges. An experimental procedure is developed that enables processing of
large volumes of video images and thus allows capturing the spatial
structure of the instantaneous wave field along the whole tank. The
experimentally obtained data are compared quantitatively with the solutions
of the Modified Nonlinear Schrödinger (MNLS, or Dysthe) equation written
in either temporal or spatial form. The adopted approach allows studying
evolution along the tank of wave frequency spectra, as well as the temporal
variation of the wave number spectra. It is demonstrated that accounting for
the 2nd order bound (locked) waves is essential for getting a
qualitative and quantitative agreement between the measured and the computed
spectra. The relation between the frequency and the wave number spectra is
discussed. |
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