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| Titel |
Performance of coastal sea-defense infrastructure at El Jadida (Morocco) against tsunami threat: lessons learned from the Japanese 11 March 2011 tsunami |
| VerfasserIn |
R. Omira, M. A. Baptista, F. Leone, L. Matias, S. Mellas, B. Zourarah, J. M. Miranda, F. Carrilho, J.-P. Cherel |
| 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 Science ; 13, no. 7 ; Nr. 13, no. 7 (2013-07-12), S.1779-1794 |
| Datensatznummer |
250018554
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| Publikation (Nr.) |
 copernicus.org/nhess-13-1779-2013.pdf |
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| Zusammenfassung |
| This paper seeks to investigate the effectiveness of sea-defense structures
in preventing/reducing the tsunami overtopping as well as evaluating the
resulting tsunami impact at El Jadida, Morocco. Different tsunami wave
conditions are generated by considering various earthquake scenarios of
magnitudes ranging from Mw = 8.0 to Mw = 8.6. These
scenarios represent the main active earthquake faults in the SW Iberia margin
and are consistent with two past events that generated tsunamis along the
Atlantic coast of Morocco. The behaviour of incident tsunami waves when
interacting with coastal infrastructures is analysed on the basis of
numerical simulations of near-shore tsunami waves' propagation. Tsunami
impact at the affected site is assessed through computing inundation and
current velocity using a high-resolution digital terrain model that
incorporates bathymetric, topographic and coastal structures data. Results,
in terms of near-shore tsunami propagation snapshots, waves' interaction with
coastal barriers, and spatial distributions of flow depths and speeds, are
presented and discussed in light of what was observed during the 2011
Tohoku-oki tsunami. Predicted results show different levels of impact that
different tsunami wave conditions could generate in the region. Existing
coastal barriers around the El Jadida harbour succeeded in reflecting
relatively small waves generated by some scenarios, but failed in preventing
the overtopping caused by waves from others. Considering the scenario highly
impacting the El Jadida coast, significant inundations are computed at the
sandy beach and unprotected areas. The modelled dramatic tsunami impact in
the region shows the need for additional tsunami standards not only for
sea-defense structures but also for the coastal dwellings and houses to
provide potential in-place evacuation. |
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