Tidal Turbulence and Eddy-Viscosity in Coastal Waters at Northeastern Brazil

Araújo, Moacyr; Lheritier, David; Silva, Marcus André; Luna, Marco C.M. de M.; Medeiros, Carmen

doi:10.2112/02-144.1

Cited by 10 publications

(11 citation statements)

References 17 publications

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“…This observation agrees with Araujo et al (2005), who associated the stronger surface deviations in current intensity and direction to the slack water periods in Suape, when the wind shear stress is easily felt in the water column.…”

Section: Winter Periodsupporting

confidence: 92%

“…Otherwise, during the winter period, the northeastward current preponderated as a consequence of the southeasterly trades, which are common during this season (SILVA et al, 2009). Weak wind shear effects associated with strong bottom variations in current direction were observed during dynamic tidal stages, when gravitational forces overrule the flow, as was observed by Araujo et al (2005).…”

Section: Winter Periodsupporting

confidence: 56%

“…Below this region, a well-mixed and homogeneous flow has been observed. The current intensity indicates the influence of momentum exchange near the surface and bottom boundary layers (ARAUJO et al, 2005). According to the upper flow structures, the authors observed strong surface variations in the current intensity and direction, which were associated with slack waters, when the wind effects were more pronounced.…”

Section: Study Area Planning and Preparationsmentioning

confidence: 96%

“…The average annual rainfall is 1,500 mm, and the evaporation is 1,200 mm. According to Araujo et al (2005), semidiurnal tides occur at Suape with a mean spring (neap) range of 2.2 m (1.1 m). The southeasterly trade winds are predominant throughout the year, oscillating from the east and the northeast during summer (LINS, 2002).…”

Section: Study Area Planning and Preparationsmentioning

confidence: 99%

“…The authors also noticed weak wind shear effects near the surface that were associated with strong bottom variations in current direction during the dynamic tidal stages, when gravitational forces drive the flow. As stated by Araujo et al (2005), the energy balance is often driven by the equilibrium between the production and dissipation of turbulent kinetic energy (TKE) near boundaries. The stronger dissipation rates are associated with the surface and bottom boundary layers during spring tides, and the less accentuated rates occur at inner regions of the flow.…”

Section: Study Area Planning and Preparationsmentioning

confidence: 99%

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Field study of a simulated subsurface gas blowout in tropical and shallow water along the Brazilian Coast.

Leite¹,

Araujo²,

Silva³

et al. 2012

TropOcean

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Apesar da exploração marinha de óleo e gás ter experimentado um rápido crescimento em regiões de baixa latitude, poucos experimentos em águas rasas tropicais têm sido publicados pela comunidade científica. Este estudo foi desenvolvido com o objetivo de incrementar o conhecimento acerca do comportamento de uma pluma de gás natural durante um vazamento acidental em águas rasas tropicais. Experimentos de campo foram realizados através da reprodução in situ de um vazamento de gás natural a aproximadamente 30 m de profundidade ao largo do Porto de Suape, na costa nordeste do Brasil. Quatro cenários distintos foram associados a diferentes fluxos de gás e períodos sazonais. Os fluxos de gás liberados durante os cenários foram configurados para 3.000 e 9.000 L.h-1 (vazões baixa e alta, respectivamente). Durante o verão austral foram registrados ventos de leste-nordeste com intensidade média de 7,2 m.s-1 ; altura significativa das ondas por volta de 0,9 m propagando-se para oeste; intensidade de corrente na superfície de aproximadamente 0,5 m.s-1 com direção sul-sudoeste; estratificação vertical; deslocamento das plumas na direção sul-sudoeste e largura das plumas de até 2,7 m perto da superfície. Durante o inverno austral foram observados ventos de sudeste com intensidade média de 6,6 m.s-1 ; altura significativa das ondas por volta de 1,6 m propagando-se para noroeste; intensidades de corrente superficiais similares às do verão direcionando-se para nordeste; uma coluna d’água levemente misturada; plumas de gás com largura maior do que 1,3 m próximo à superfície e deslocamento para nordeste-norte. O movimento das plumas foi influenciado pelas forçantes de maré e meteorológica, nesta ordem. A diferença no diâmetro da pluma ocorreu principalmente na camada mais próxima à superfície. As medições de correntes indicaram que as bolhas de gás não afetam a hidrodinâmica local. Palavras chave: Dados experimentais, Gás natural, Vazamentos submarinos, Atlântico tropical.

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Section: Winter Periodsupporting

confidence: 92%

Section: Winter Periodsupporting

confidence: 56%

Section: Study Area Planning and Preparationsmentioning

confidence: 96%

Section: Study Area Planning and Preparationsmentioning

confidence: 99%

Section: Study Area Planning and Preparationsmentioning

confidence: 99%

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