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| Titel |
Analysis of extreme wave events on the southern coast of Brazil |
| VerfasserIn |
P. V. Guimarães, L. Farina, E. E. Toldo Jr. |
| 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 ; 14, no. 12 ; Nr. 14, no. 12 (2014-12-03), S.3195-3205 |
| Datensatznummer |
250118797
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| Publikation (Nr.) |
 copernicus.org/nhess-14-3195-2014.pdf |
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| Zusammenfassung |
| Using the wave model SWAN (simulating waves
nearshore), high waves on the southwestern Atlantic
generated by extra-tropical cyclones are simulated from 2000 to 2010,
and their impact on the Rio Grande do Sul (RS) coast is studied. The
modeled waves are compared with buoy data and good agreement is
found. The six extreme events in the period that presented
significant wave heights above 5 m, on a particular point of
interest, are investigated in detail. It is found that the
cyclogenetic pattern between the latitudes 31.5 and
34° S is the most favorable for developing high
waves. Hovmöller diagrams for deep water show that the region
between the south of Rio Grande do Sul up to a latitude of 31.5° S
is the most energetic during a cyclone's passage, although the event
of May 2008 indicates that the location of this region can vary,
depending on the cyclone's displacement. On the other hand, the
Hovmöller diagrams for shallow water show that the different
shoreface morphologies were responsible for focusing or dissipating
the waves' energy; the regions found are in agreement with the
observations of erosion and progradation regions. It can be concluded
that some of the urban areas of the beaches of Hermenegildo, Cidreira,
Pinhal, Tramandaí, Imbé and Torres have been more exposed during
the extreme wave events on the Rio Grande do Sul coast, and are more
vulnerable to this natural hazard. |
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