O Clima De Ondas Na Costa Sul De Arraial Do Cabo, Rj: Distribuição De Parâmetros De Onda

Pereira, José Antônio Vilar; Candella, Rogério Neder; Carvalho, J. L.

doi:10.14210/bjast.v4n1.p1-9

Cited by 4 publications

(6 citation statements)

References 2 publications

(2 reference statements)

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“…In spite of their importance, wave measurements in Brazil are very scarce, and only a few studies assessed regional wave characteristics based on short-term observations (e.g. : CANDELLA, 1997;PEREIRA et al, 2000;ARAÚJO et al, 2003;BENSI et al, 2005). However, with the development of accurate ocean-atmosphere interaction models such as the NOAA WAVEWATCH-III -NWW3 (TOLMAN, 1999), it has become possible to obtain long term time series data from model hindcast.…”

Section: Introductionmentioning

confidence: 99%

Brazilian offshore wave climate based on NWW3 reanalysis

2010

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A B S T R A C TThis paper provides a description of the wave climate off the Brazilian coast based on an eleven-year time series (Jan/1997-Dec/2007) obtained from the NWW3 operational model hindcast reanalysis. Information about wave climate in Brazilian waters is very scarce and mainly based on occasional short-term observations, the present analysis being the first covering such temporal and spatial scales. To define the wave climate, six sectors were defined and analyzed along the Brazilian shelf-break: South (W1), Southeast (W2), Central (W3), East (W4), Northeast (W5) and North (W6). W1, W2 and W3 wave regimes are determined by the South Atlantic High (SAH) and the passage of synoptic cold fronts; W4, W5 and W6 are controlled by the Intertropical Convergence Zone (ITCZ) and its meridional oscillation. The most energetic waves are from the S, generated by the strong winds associated to the passage of cold fronts, which mainly affect the southern region. Wave power presents a decrease in energy levels from south to north, with its annual variation showing that the winter months are the most energetic in W1 to W4, while in W5 and W6 the most energetic conditions occur during the austral summer. The information presented here provides boundary conditions for studies related to coastal processes, fundamental for a better understanding of the Brazilian coastal zone. R E S U M OO presente trabalho apresenta o clima de ondas da região ao largo da costa brasileira com base em uma série temporal de onze anos (Jan/1997-Dez/2007) obtida através de dados de reanálise do modelo operacional NWW3. Informações sobre o regime de ondas no Brasil são escassas e baseadas em observações ocasionais de curto período, sendo a presente análise inédita na escala espaço-temporal apresentada. Para a definição do clima de ondas foram definidos e analisados seis setores ao longo da quebra da plataforma continental brasileira: Sul (W1), Sudeste (W2), Central (W3), Leste (W4), Nordeste (W5) e Norte (W6). W1, W2 e W3 possuem os regimes de ondas controlados pela Alta Subtropical do Atlântico Sul (ASAS) e pela passagem de frentes frias sinóticas; W4, W5 e W6 são controlados pela Zona de Convergência Intertropical (ZCIT) e sua oscilação meridional. As ondas mais energéticas são de S, geradas por ventos intensos associados à passagem de frentes frias, afetando principalmente a região sul e sudeste do país. A energia das ondas apresenta um decréscimo de sul para norte, com a sua variação anual mostrando que o período de inverno as ondas são mais energéticas nos setores W1 a W4, enquanto que nos setores W5 e W6 as condições mais energéticas ocorrem nos meses de verão do hemisfério sul. As informações aqui apresentadas fornecem condições de contorno para diferentes estudos relacionados a processos costeiros, fundamentais para a melhor compreensão da zona costeira do Brasil.

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Section: Introductionmentioning

confidence: 99%

Brazilian offshore wave climate based on NWW3 reanalysis

2010

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“…Em outros estudos com participação do mesmo autor, foram analisadas as ondas da região sul da cidade de Arraial do Cabo, que permitiram os resultados de algumas características interessantes como, por exemplo, a altura média das ondas, que na maior parte do tempo variou entre 100 e 200 cm em períodos de 11 a 13 segundos. Um segundo pico de energia veio de ESE a SSE com períodos predominando entre 7 e 9 segundos (PEREIRA; CANDELLA; CARVALHO, 2000).…”

Section: Energia Das Ondasunclassified

Estudo da Viabilidade de Utilização de uma Máquina de Fluxo Transversal Linear como parte da Estrutura do Conversor de Energia das Ondas Point Absorber

et al. 2017

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“…On the Southern Shelf of Brazil, waves have amplitudes between 1 and 1.5m, periods between 6 and 14s and come mainly from the southeast (Cuchiara et al, 2009). The analysis of 11 years of model data from the operational system WAVEWATCH III showed that, along the Brazilian coast, the energy of the waves decreases from north to south (Pianca et al, 2010). This result reflects the wind regime on the southsoutheastern coast, which is consistently impacted by the passage of cold front systems, with strong winds from the S-SW (Rodrigues et al, 2004;Dominguez, 2006), while on the northeastern coast the trade winds are the main source that generate gravity waves.…”

Section: Introductionmentioning

confidence: 98%

“…At Cabo Frio, for instance, the waves come mainly from the SSE-SSW with periods between 11 and 13s (Pereira et al, 2010). On the Southern Shelf of Brazil, waves have amplitudes between 1 and 1.5m, periods between 6 and 14s and come mainly from the southeast (Cuchiara et al, 2009).…”

Section: Introductionmentioning

confidence: 98%

Evaluating the gravity wave energy potential off the Brazilian coast

2018

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Gomes et al.: Wave energy off the Brazilan coast 220Evaluating the gravity wave energy potential off the Brazilian coast The wave energy potential on the Brazilian coast is estimated using in-situ buoy data and model data. The results present a greater potential on the southern-southeastern coast than on the northeastern coast, but the variance is also larger. These seem to be associated with the different atmospheric regimes. While in the northeastern portion the trade winds determine the wave regime, in the south the passage of cold front systems plays a major role. For almost all regions and throughout the year, the energy potential oscillates between 10 and 30 kW/m, the most efficient range to implement wave energy converters. The occurrence of sea states is also assessed, showing that the passage of cold front systems also creates different sea states in the S-SW area. Finally, the most common sea states and energy flux are estimated, showing a shift towards longer periods and higher waves for the latter. On the S-SW coast, although the most frequent sea states have waves with periods around 8 s, the energy flux has a more balanced distribution between these and the waves with periods around 11s, the common period for waves generated by cold front systems. This result shows that the most common sea state is not necessarily the one that should be considered when planning wave energy converters for the region. AbstrAct

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O Clima De Ondas Na Costa Sul De Arraial Do Cabo, Rj: Distribuição De Parâmetros De Onda

Cited by 4 publications

References 2 publications

Brazilian offshore wave climate based on NWW3 reanalysis

Brazilian offshore wave climate based on NWW3 reanalysis

Estudo da Viabilidade de Utilização de uma Máquina de Fluxo Transversal Linear como parte da Estrutura do Conversor de Energia das Ondas Point Absorber

Evaluating the gravity wave energy potential off the Brazilian coast

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