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| Titel |
The role of diffraction effects in extreme run-up inundation at Okushiri Island due to 1993 tsunami |
| VerfasserIn |
K. O. Kim, D. C. Kim, B. H. Choi, K. T. Jung, J. H. Yuk, E. Pelinovsky |
| 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. 4 ; Nr. 15, no. 4 (2015-04-08), S.747-755 |
| Datensatznummer |
250119415
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| Publikation (Nr.) |
 copernicus.org/nhess-15-747-2015.pdf |
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| Zusammenfassung |
The tsunami generated on 12 July 1993 by the Hokkaido–Nansei–Oki earthquake
(Mw = 7.8) brought about a maximum wave run-up of 31.7 m, the
highest recorded in Japan during the 20th century, near the Monai Valley on the west
coast of Okushiri Island (Hokkaido Tsunami Survey Group, 1993). To
reproduce the extreme run-up height, the three-dimensional non-hydrostatic
model (Flow Science, 2012), referred to here as the NH-model, has been locally applied with
open boundary conditions supplied in an offline manner by the
three-dimensional hydrostatic model (Ribeiro et al., 2011), referred to here as the
H-model. The area of the H-model is sufficiently large to cover the entire fault
region with one-way nested multiple domains. For the initial water
deformation, Okada's fault model (1985) using the sub-fault parameters is
applied.
Three NH-model experiments have been performed, namely without islands, with one island and with two islands. The
experiments with one island and with two islands give rise to values close
to the observation with maximum run-up heights of about 32.3 and 30.8 m,
respectively, while the experiment without islands gives rise to about 25.2 m.
The diffraction of the tsunami wave primarily by Muen Island, located in the
south, and the southward topographic guiding of the tsunami run-up at the coast
are, as in the laboratory simulation (Yoneyama et al., 2002), found to result
in the extreme run-up height near Monai Valley. The presence of Hira
Island enhances the diffraction of tsunami waves but its contribution to
the extreme run-up height is marginal. |
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