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| Titel |
Dispersive mudslide-induced tsunamis |
| VerfasserIn |
A. Rubino, S. Pierini, J. O. Backhaus |
| 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 ; 5, no. 3 ; Nr. 5, no. 3, S.127-136 |
| Datensatznummer |
250002473
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| Publikation (Nr.) |
 copernicus.org/npg-5-127-1998.pdf |
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| Zusammenfassung |
| A nonlinear nested model for mudslide-induced tsunamis is
proposed in which three phases of the life of the wave, i.e. the generation, far-field
propagation and costal run-up are described by means of different mathematical models,
that are coupled through appropriate matching procedures. The generation and run-up
dynamics are simulated through a nonlinear shallow-water model with movable lateral
boundaries: in the generation region two active layers are present, the lower one
describing the slide descending on a sloping topography. For the intermediate phase,
representing wave propagation far from the generation region, the hydrostatic assumption
is not assumed as appropriate in general and, therefore, a nonlinear model allowing for
weak phase dispersion, namely a Kadomtsev-Petviashvili equation, is used. This choice is
made in order to assess the relevance of dispersive features such as solitary waves and
dispersive tails. It is shown that in some realistic circumstances dispersive
mudslide-induced tsunami waves can be produced over relatively short, distances. In such
cases the use of a hydrostatic model throughout the whole tsunami history turns out to
give erroneous results. In particular, when solitary waves are generated during the
tsunami propagation in the open sea, the resulting run-up process yields peculiar wave
forms leading to amplified coastal inundations with respect to a mere hydrostatic context. |
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