Analysis of extreme wave events on the southern coast of Brazil
-
Published:2014-12-03
Issue:12
Volume:14
Page:3195-3205
-
ISSN:1684-9981
-
Container-title:Natural Hazards and Earth System Sciences
-
language:en
-
Short-container-title:Nat. Hazards Earth Syst. Sci.
Author:
Guimarães P. V.,Farina L.,Toldo Jr. E. E.
Abstract
Abstract. 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.
Funder
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences
Reference30 articles.
1. Almeida, L. P., Vousdoukas, M. V., Ferreira, Ó., Rodrigues, B. A., and Matias, A.: Thresholds for storm impacts on an exposed sandy coastal area in southern Portugal, Geomorphology, 143–144, 3–12, https://doi.org/10.1016/j.geomorph.2011.04.047, 2012. 2. Booij, N., Ris, R. C., and Holthuijsen, L. H.: A third-generation wave model for coastal regions: 1. Model description and validation, J. Geophys. Res., 104, 7649–7666, https://doi.org/10.1029/98JC02622, 1999. 3. Calliari, L. J., Speranski, N., and Boukareva, I.: Stable focus of waves rays as a reason of local erosion at southern Brazil coast, J. Coastal Res., 26, 19–23, 1998a. 4. Calliari, L. J., Tozzi, H. A. M., and Klein, A. H. F.: Beach morphology and coastline erosion associated with storm surges, An. Acad. Bras. Ciênc., 70, 232–247, 1998b. 5. Dillenburg, S. R., Esteves, L. S., and Tomazelli, L. J.: A critical evaluation of coastal erosion in Rio Grande do Sul, Southern Brazil, Ann. Brazil. Acad. Sci., 76, 611–623, 2004.
Cited by
27 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|