A water flow pattern analysis of Guajará Bay: Amazon Estuary - Brazil

Barros, Maria de Lourdes Cavalcanti; Sena, Manoel José dos Santos; Mesquita, André Luiz Amarante; Blanco, Cláudio José Cavalcante; Secretan, Yves

doi:10.1590/s1678-58782011000100012

Cited by 15 publications

(10 citation statements)

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“…The higher levels of conductivity and concentrations of N-compounds at stations S3, S4, S6 and S7 were related to the organic matter and domestic wastes poured into the bay. It is suggested that the higher concentrations of NO 3 (compatible with the ichthyoplankton life) in a stretch where currents are weaker (Barros et al 2011) contributed to the higher larval diversity and to the approximation to the city of post-flexion clupeiforms. Ammonia levels of toxicity for fish vary considerably with pH, temperature, dissolved oxygen, taxa and development stages (Vosylienë & Kazlauskienë 2004, Eddy 2005.…”

Section: Discussionmentioning

confidence: 99%

“…The deepest areas and stronger currents are encountered at the Onça Island Channel, on the left margin of the Guajará Bay (Figure 1) and at the Guamá River main channel, on the right-hand side of the river bed. In comparison, water currents at the city waterfront are weaker, preventing large dispersion of contaminants poured in the bay (Barros et al 2011). Further data on the hydrodynamic of the Guajará Bay and Guamá River are available in Barros et al (2011) and Bezerra et al (2011).…”

mentioning

confidence: 99%

“…In comparison, water currents at the city waterfront are weaker, preventing large dispersion of contaminants poured in the bay (Barros et al 2011). Further data on the hydrodynamic of the Guajará Bay and Guamá River are available in Barros et al (2011) and Bezerra et al (2011).…”

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confidence: 99%

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Spatio-temporal distribution of fish larvae in relation to ontogeny and water quality in the oligohaline zone of a North Brazilian estuary

2013

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Larval fish assemblage in Guajará Bay was studied through four quarterly field campaigns and discussed in relation to individuals' development stages and exposure to contaminants poured out by the Pará State Capital City, Belém. Larval densities were low and diversity extremely poor with a strong dominance of clupeids, engraulids and, to a lower extent, sciaenids. The main spawning season was registered at the onset of the rainy period. Pre-flexion and flexion clupeiforms remained in the farmost stations from the city while post-flexion larvae were found near urban activity centres. Unlikely, pre-flexion and flexion sciaenids were scattered along the city waterfront. Post-flexion larvae were rare; it is suggested that sciaenids use the bay as a transitory route between their spawning grounds and more distant nursery grounds. The waters around the city of Belém showed signs of contamination. However, based on the literature, Guajará Bay environmental quality at the time of the study was suitable for fish larvae life. Nitrate with pH best explained larval distribution. Resumo: O padrão de distribuição das larvas de peixes na Baía do Guajará foi estudado através de coletas trimestrais e discutido em relação aos estágios de desenvolvimento dos indivíduos e a exposição dos mesmos aos contaminantes despejados pela Capital do Estado do Pará, Belém. A densidade e a diversidade larval foram baixas com forte dominância dos clupeídeos, engraulídeos e, em menor grau, os cianídeos. O principal período de reprodução foi definido no início do período chuvoso. Larvas de Clupeiformes em pré-flexão e flexão foram encontradas nos pontos de coletas mais afastados da cidade, enquanto aquelas em pós-flexão prevaleceram nas margens da cidade. Por outro lado, os cianídeos em pré-flexão e flexão foram capturados perto dos centros de atividade urbana, enquando aqueles em pós-flexão foram pouco abundantes. É sugerido que a baía se encontra na rota migratória dos cianídeos entre a área de desova e os berçários mais distantes. Apesar das águas no entorno da cidade de Belém mostraram sinais de contaminação, a qualidade ambiental na Baía do Guajará no momento do estudo estava apropriada para a vida das larvas de peixes. Nitrato com pH foram as variáveis que melhor explicaram a distribuição larval. Palavras-chave: Ictioplâncton, Amazônia, impacto urbano, Belém.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Spatio-temporal distribution of fish larvae in relation to ontogeny and water quality in the oligohaline zone of a North Brazilian estuary

2013

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“…For the Belém embankment, a classic shallow-water twodimensional hydrodynamic model was used, calibrated by Barros et al (2011) with respect to free-surface elevation above mean water level. However, validation with observed data was necessary to assess model accuracy with respect to the simulated velocities.…”

Section: Hydrodynamic Modelmentioning

confidence: 99%

“…In the Amazon estuary region, where the tidal range is up to 4 m, interactions between the river and oceanic flows and the local morphology combine to produce a complex flow pattern around the city of Belém in Brazil (Barros et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic evaluation of a flood embankment in the Amazon estuary region, Brazil

Blanco¹,

Sena²,

Mesquita³

et al. 2013

Proceedings of the Institution of Civil Engineers - Civil Engin

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1 2 3 4 5 Climate change and sea-level rise are likely to have a significant impact on the low-lying coastal areas of Brazil around the Amazon estuary. However, the huge river flows -equivalent to a fifth of the world's total -combined with strong tidal effects and complex coastal morphology make the design and analysis of future flood protection works particularly challenging. This paper reports on the development, calibration and application of a successful hydrodynamic model for a new flood embankment in the coastal city of Belém. The model uses a geographic information system and finite-element method to solve shallow water equations, and appears suitable for wider application in the Amazon estuary.

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Riverbank erosion and char stability along the fluvial-to-tidal transition zone in the Lower Meghna River and Tentulia Channel in the Ganges-Brahmaputra-Meghna Delta, Bangladesh

Valentine

Wilson

2023

Geomorphology

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A water flow pattern analysis of Guajará Bay: Amazon Estuary - Brazil

Abstract: This work describes the steps required to construct a hydrodynamic model of the Guajará

Cited by 15 publications

References 4 publications

Spatio-temporal distribution of fish larvae in relation to ontogeny and water quality in the oligohaline zone of a North Brazilian estuary

Spatio-temporal distribution of fish larvae in relation to ontogeny and water quality in the oligohaline zone of a North Brazilian estuary

Hydrodynamic evaluation of a flood embankment in the Amazon estuary region, Brazil

Riverbank erosion and char stability along the fluvial-to-tidal transition zone in the Lower Meghna River and Tentulia Channel in the Ganges-Brahmaputra-Meghna Delta, Bangladesh

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