Low-frequency circulation on the Ilha Grande channel, Rio de Janeiro, Brazil

Rodrigues, Douglas Fraga; Fernandes, Alexandre Macedo; Filippo, Alessandro; Kjerfve, Björn; Pinto, Lı́gia; Neves, Ramiro

doi:10.1016/j.rsma.2021.102129

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…Seasonality (periods ranging between 30 days and 1 year) accounts for 28.2%, while local winds (with periods ranging between 2 h and 3 days) contribute 5.8%. Similar findings were reported by Rodrigues et al [31], who found that 67.5% of the total signal variance corresponds to the subinertial along-channel currents component, featuring periods ranging from 2 to 30 days. Melo Filho [8] also noted that 50% of the meteorological influence in Rio de Janeiro originates from the area south of Imbituba, while 30% arises from the region between Imbituba and Rio de Janeiro.…”

Section: Introductionsupporting

confidence: 90%

Meteorological Signal on Hydrodynamics in the Ilha Grande and Sepetiba Bays: Lag Effects and Coastal Currents

Pereira,

Vinzón,

Gallo

et al. 2024

Hydrology

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On the southeastern coast of Brazil, the bays of Ilha Grande and Sepetiba are linked by the Ilha Grande Channel, where remarkably strong currents have been consistently observed. Tidal forces cannot explain the strength of these currents. Previous researchers have focused on investigating factors like baroclinic effects due to salinity differences or seiches between two basins without a conclusive answer. This study aims to elucidate the role of remote meteorological effects within this complex hydrodynamic system. A numerical approach with a coastal model nested within an ocean model was employed, enabling an in-depth examination of the intricate interplay between meteorological and tidal forcings. The study revealed a significant finding: the lag in signal propagation plays a pivotal role in determining how these signals impact the dynamics of the bays. The astronomical signal exhibits a minimal lag along the coast (1 min) and leads to water level differences between the sea and the coastline, resulting in the generation of tidal currents at the bay entrances. On the other hand, the remote meteorological signal, with a stronger signal lag along the coast (4.92 h), leads to the creation of a water level difference between the bay entrances, inducing significant fluxes along the narrow Ilha Grande Channel.

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Section: Introductionsupporting

confidence: 90%

Meteorological Signal on Hydrodynamics in the Ilha Grande and Sepetiba Bays: Lag Effects and Coastal Currents

Pereira,

Vinzón,

Gallo

et al. 2024

Hydrology

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Assessment of the environmental sustainability of cobia fish farm (Rachycentron Canadum) in the bay of Ilha Grande - Brazil and the relationship with benthic macrofauna

Campos¹,

Pereira²,

Fernandes³

et al. 2022

JAMB

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Studies on the sustainability of aquaculture have been carried out around the world. The input of organic matter in the sediment and the influence of current velocity on the deposition of particles produced by fish in captivity can be used to assess the distribution of benthic assemblages below marine farms. Sediment and benthic organisms were collected in April, September and December 2019 and in August and October 2020 in the fish farming area and in two control areas in the Bananal cove in Ilha Grande Bay. The measurement of the speed of local currents was carried out below the net-tank, in periods of 24 days in of April and July 2019. The heterogeneity of the biological data was evident between the collection points, indicating that several factors can influence the distribution of benthic macrofauna. There was no correlation between the values of organic matter and species richness and for organic matter and species diversity. The values of the Marine Biotic Index (AMBI) for the three collection stations were smaller than 1 (one), that is, there was a predominance of species sensitive to pollution and organic enrichment. The marine farm and the control areas were considered an unpolluted environment. The results also indicated that the local currents presented insufficient intensities to disperse the organic matter produced in the marine farm to the control areas.

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Low-frequency circulation on the Ilha Grande channel, Rio de Janeiro, Brazil

Cited by 2 publications

References 19 publications

Meteorological Signal on Hydrodynamics in the Ilha Grande and Sepetiba Bays: Lag Effects and Coastal Currents

Meteorological Signal on Hydrodynamics in the Ilha Grande and Sepetiba Bays: Lag Effects and Coastal Currents

Assessment of the environmental sustainability of cobia fish farm (Rachycentron Canadum) in the bay of Ilha Grande - Brazil and the relationship with benthic macrofauna

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