Determination of circulation and short period fluctuation in Ilha Grande Bay (RJ), Brazil

Autores

  • Yoshimine Ikeda Universidade de São Paulo; Instituto Oceanográfico
  • Merritt Stevenson Universidade de São Paulo; Instituto Oceanográfico

DOI:

https://doi.org/10.1590/S0373-55241980000100007

Resumo

A mesosoale study was made of the Ilha Grande area. The local circulation described through -progressive vector diagrams showed a clochwise bottom circulation determined in June 1976, while in the upper 10 m the direction of the flow entering the Ilha Grande Bay was towards the center in the west and towards the Marambaia sandbank in the east side of the Bay. Short periods and amplitude fluctuations were evaluted using power spectral analysis, Fourier and Maximum Entropy Method, which showed that in the upper 10 m predominant periods decrease from 1.1h (A = 6.3cm sec-1) (position = 3C) to 1.0h (A = 7.4 cm sec-1) (position = 2D) and increase to 5.8h (A = 6.8 cm., sec-1) (position = ID), while at the bottom layer the predominant period increases from 0.4 h (A = 5.0 cm sec-1) (position = 3G) to 6.4h (A = 7.0 cm sec-1) (position = 2G) and to 4.4h (A = 7.9 cm sec-1) (position = 1G) . From the original data it has been possible to determine an "intense pulsation" between 30-70 cm sec-1 in the upper 10 m with about 1.0h period and 10-20 min duration in all the stations.

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Publicado

1980-01-01

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Determination of circulation and short period fluctuation in Ilha Grande Bay (RJ), Brazil . (1980). Boletim Do Instituto Oceanográfico, 29(1), 89-98. https://doi.org/10.1590/S0373-55241980000100007