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| Titel |
Deterministic approach for multiple-source tsunami hazard assessment for Sines, Portugal |
| VerfasserIn |
M. Wronna, R. Omira, M. A. Baptista |
| 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. 11 ; Nr. 15, no. 11 (2015-11-30), S.2557-2568 |
| Datensatznummer |
250119778
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| Publikation (Nr.) |
 copernicus.org/nhess-15-2557-2015.pdf |
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| Zusammenfassung |
| In this paper, we present a deterministic approach to tsunami hazard
assessment for the city and harbour of Sines, Portugal, one of the test sites
of project ASTARTE (Assessment, STrategy And Risk Reduction for Tsunamis in
Europe). Sines has one of the most important deep-water ports, which has
oil-bearing, petrochemical, liquid-bulk, coal, and container terminals. The
port and its industrial infrastructures face the ocean southwest towards the
main seismogenic sources. This work considers two different seismic zones:
the Southwest Iberian Margin and the Gloria Fault. Within these two regions,
we selected a total of six scenarios to assess the tsunami impact at the test
site. The tsunami simulations are computed using NSWING, a Non-linear Shallow
Water model wIth Nested Grids. In this study, the static effect of tides is
analysed for three different tidal stages: MLLW (mean lower low water), MSL
(mean sea level), and MHHW (mean higher high water). For each scenario, the
tsunami hazard is described by maximum values of wave height, flow depth,
drawback, maximum inundation area and run-up. Synthetic waveforms are
computed at virtual tide gauges at specific locations outside and inside the
harbour. The final results describe the impact at the Sines test site
considering the single scenarios at mean sea level, the aggregate scenario,
and the influence of the tide on the aggregate scenario. The results confirm
the composite source of Horseshoe and Marques de Pombal faults as the
worst-case scenario, with wave heights of over 10 m, which reach the coast
approximately 22 min after the rupture. It dominates the aggregate scenario
by about 60 % of the impact area at the test site, considering maximum wave
height and maximum flow depth. The HSMPF scenario inundates a total area of
3.5 km2. |
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