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| Titel |
Simulating tsunami propagation in fjords with long-wave models |
| VerfasserIn |
F. Løvholt, S. Glimsdal, P. Lynett, G. Pedersen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Sciences ; 15, no. 3 ; Nr. 15, no. 3 (2015-03-27), S.657-669 |
| Datensatznummer |
250119379
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| Publikation (Nr.) |
 copernicus.org/nhess-15-657-2015.pdf |
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| Zusammenfassung |
| Tsunamis induced by rock slides constitute a severe hazard towards coastal
fjord communities. Fjords are narrow and rugged with steep slopes, and
modeling the short-frequency and high-amplitude tsunamis in this environment
is demanding. In the present paper, our ability (and the lack thereof) to
simulate tsunami propagation and run-up in fjords for typical wave
characteristics of rock-slide-induced waves is demonstrated. The starting
point is a 1 : 500 scale model of the topography and bathymetry of the
southern part of Storfjorden fjord system in western Norway. Using measured
wave data from the scale model as input to numerical simulations, we find
that the leading wave is moderately influenced by nonlinearity and
dispersion. For the trailing waves, dispersion and dissipation from the
alongshore inundation on the traveling wave become more important. The
tsunami inundation was simulated at the two locations of Hellesylt and
Geiranger, providing a good match with the measurements in the former location.
In Geiranger, the most demanding case of the two, discrepancies are larger.
The discrepancies may be explained by a combinations of factors, such as the
accumulated errors in the wave propagation along large stretches of the
fjord, the coarse grid resolution needed to ensure model stability, and
scale effects in the laboratory experiments. |
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