Abstract
A discussion of the tidal, wind-driven, and density-driven aspects of the circulation in Bay of Ilha Grande and Bay of Sepetiba (Brazil) based on historical data and hydrographie and current mete'r data collected in September of 1977, is presented in this paper. The data analysis has shewn a remarkable contrast between the circulations of these two adjacent Bays. The circulation in Bay of Sepetiba is strongly tidalwhereas Bay of Ilha Grande has a weak tidal circulation superimposed by a quasi-steady flow induced by density gradients. The stratification is maintained because Bay of Ilha Grande, beeing deeper, allows colder and saltier shelf water to flow eastward towards the fresher and warmer water flowing out of Bay of Sepetiba, highly influencedby river runoff. The velocity and density fields have shown seiche oscillations that agree very well with theoretically derived modes inherent to the local geometry and density stratification.
ARTIGOS
A study of the circulation in Bay of Ilha Grande and Bay of Sepetiba* * This paper is part of a Ph. D. Thesis submitted to the Graduated School of Oceanography of the University of Rhode Island, USA. . Part I. a survey of the circulation based on experimental field data
Sérgio Romano Signorini
Instituto Oceanográfico da Universidade de São Paulo
SYNOPSIS
A discussion of the tidal, wind-driven, and density-driven aspects of the circulation in Bay of Ilha Grande and Bay of Sepetiba (Brazil) based on historical data and hydrographie and current mete'r data collected in September of 1977, is presented in this paper. The data analysis has shewn a remarkable contrast between the circulations of these two adjacent Bays. The circulation in Bay of Sepetiba is strongly tidalwhereas Bay of Ilha Grande has a weak tidal circulation superimposed by a quasi-steady flow induced by density gradients. The stratification is maintained because Bay of Ilha Grande, beeing deeper, allows colder and saltier shelf water to flow eastward towards the fresher and warmer water flowing out of Bay of Sepetiba, highly influencedby river runoff. The velocity and density fields have shown seiche oscillations that agree very well with theoretically derived modes inherent to the local geometry and density stratification.
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(Received in 29/April/1980)
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- INPH. 1977a. Relatório dos estudos hidráulicos na Baia de Sepetiba executados pelo INPH entre 08/1974 a 12/1975. Rio de Janeiro, Instituto de Pesquisas Hidroviárias, vol. 1.
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- MIRANDA, L. B. de; IKEDA, Y.; CASTRO FILHO, B, M. de & PEREÍRA FILHO, N. 1977. Note on the occurrence of saline fronts in the Ilha Grande region (RJ). Bolm Inst. oceanogr., S Paulo, 26(2):249-256.
- NEUMANN, G. & PIERSON JR.,W. J. 1966. Principles of physical oceanography. Englewood Cliffs, N. J., Prentice- Hall, 545p.
- SIGNORINI, S. R. 1978. On the circulation and the volume transport of the Brazil Current between Cape of São Tome and Guanabara Bay (22ş-25şS and 39ş-43şW). Deep Sea Res., 25: 481-490.
- SVERDRUP, H. A.; JOHNSON, M. W. & FLEMING, R. H. 1942. The oceans, their physics, chemistry and general biology. Englewood Cliffs, N. J., Prentice-Hall, p. 1087.
Publication Dates
-
Publication in this collection
04 June 2012 -
Date of issue
1980
History
-
Received
29 Apr 1980
