A critical evaluation of coastal erosion in Rio Grande do Sul, Southern Brazil

Dillenburg, Sérgio Rebello; Esteves, Luciana S.; Tomazelli, Luiz J.

doi:10.1590/s0001-37652004000300014

Cited by 59 publications

(40 citation statements)

References 14 publications

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“…The Rio Grande do Sul coast is especially sensitive to a waves impact because of its unconsolidated sedimentary sandy barrier known as one of the longest sandy barriers in the world (615 km long) with only two permanent discontinuities, namely in the Tramandaí and the Patos Lagoon inlets (Dillenburg et al, 2004). Rio Grande city, close to the Patos Lagoon mouth, has a national strategic port facility whereas Tramandaí city receives much of the oil by means of the local offshore buoy.…”

Section: Field Descriptionmentioning

confidence: 99%

Numerical simulation of extreme wave runup during storm events in Tramandaí Beach, Rio Grande do Sul, Brazil

Guimarães

Farina

Toldo

et al. 2015

Coastal Engineering

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Section: Field Descriptionmentioning

confidence: 99%

Numerical simulation of extreme wave runup during storm events in Tramandaí Beach, Rio Grande do Sul, Brazil

Guimarães

Farina

Toldo

et al. 2015

Coastal Engineering

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“…1), including on Cassino Beach, one of the longest sandy beaches in the world (Dillenburg et al, 2004). All this extension consists of unconsolidated deposits from quaternary rivers that do not receive contributions from modern sands.…”

Section: Introductionmentioning

confidence: 99%

Analysis of extreme wave events on the southern coast of Brazil

Guimarães

Farina

Toldo

2014

Nat. Hazards Earth Syst. Sci.

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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.

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“…This region comprises about 100 freshwater lakes next to the Atlantic Ocean and long beaches bounded by a undulated barrier of migrating sandy dunes, generally oriented northeast to southwest (Dillenburg et al, 2004). The present study includes 18 coastal lakes located in the municipalities of Cidreira, Balneário Pinhal and Palmares do Sul in the northern and middle part of the coastal plain of Rio Grande do Sul ( Figure 1 and Table 1).…”

Section: Study Areamentioning

confidence: 99%

“…The systems I to III were originated during the Pleistocene and system IV in the Holocene (Schwarzbold and Schäfer, 1984;Villwock et al, 1986;Tomazelli and Villwock, 2000;Dillenburg et al, 2004). Due to its origin, the coastal lakes of Rio Grande do Sul are characterized by their low depth.…”

Section: Introductionmentioning

confidence: 99%

Morphological characterization of eighteen lakes of the north and middle coast of Rio Grande do Sul, Brazil

et al. 2014

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Aims: The present study aimed at a morphological characterization of 18 lakes of the municipalities of Cidreira, Balneário Pinhal and Palmares do Sul, situated in the northern and middle coastal plain of Rio Grande do Sul, Brazil. Methods: The morphometric survey was conducted in the summer of 2011/2012, based on echo sounder coupled with GPS and the application of remote sensing and GIS procedures. The morphometric parameters used for the characterization were: surface area, perimeter, perimeter development, volume, relative fetch, maximum depth, average depth, relative depth, median depth of volume, length and width. The statistical interpretation included Test of Normality, Coefficient of Variation, Correlation and Regression Analysis, Cluster Analysis, Discriminant Analysis and Principal Component Analysis. Results: Eighteen lakes were described and five of them are presented by aerial photo and bathymetric map. They represent the proposed morphological lake types. The calculation of the coefficient of variation revealed larger amplitudes of parameters related to lake size than to depth. The application and interpretation of cluster analysis, confirmed by discriminant analysis, distinguished those lakes in five morphological groups, which differ mainly by size and subsequently by depth. The Principal Component Analysis identified the first component with positively charged variables of size and negatively charged relative depth, and a second component with positive charge of maximum and average depths. Conclusions: The low relative depths and the exposure to constant northeastern winds reduce the transparency of the lakes. Consequently, they are light limited by suspension of inorganic and organic matter. A property that limits the application of trophic state indices. The high dynamic of the water bodies produces an oxygenated sediment surface that facilitates the settlement by aerobic organisms all over the bottom area. The shallowness and the low median depths of volume are limiting factors for sustainable water supply management. The morphological characteristics of the coastal lakes make very difficult an accurate ecological assessment based on usual trophic state criterions and a sustainable water resource management using general guidelines.Keywords: coastal lakes, morphology, coastal plain, Rio Grande do Sul, Brazil.Resumo: Objetivos: O presente estudo teve como objetivo a caracterização morfológica de 18 lagoas costeiras dos municípios de Cidreira, Balneário Pinhal e Palmares do Sul, no Litoral Norte e Médio do Rio Grande do Sul, Brasil. Métodos: No verão de 2011 e 2012 foram realizados levantamentos batimétricos, orientados por GPS, com aplicação de sensoriamento remoto e SIG. Os parâmetros morfométricos utilizados para a caracterização foram: área, perímetro, desenvolvimento de perímetro, volume, fetch relativo, profundidade máxima, profundidade média, profundidade relativa, profundidade mediana do volume, largura e comprimento. A interpretação estatística incluiu teste de normalidade, c...

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A critical evaluation of coastal erosion in Rio Grande do Sul, Southern Brazil

Cited by 59 publications

References 14 publications

Numerical simulation of extreme wave runup during storm events in Tramandaí Beach, Rio Grande do Sul, Brazil

Numerical simulation of extreme wave runup during storm events in Tramandaí Beach, Rio Grande do Sul, Brazil

Analysis of extreme wave events on the southern coast of Brazil

Morphological characterization of eighteen lakes of the north and middle coast of Rio Grande do Sul, Brazil

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