Hydrodynamic modelling of bottom currents and sediment transport in the Canyon São Tomé (Brazil)
José A. M. Lima, Osmar O. Moller, Jr, Adriano R. Viana, Rafael Piovesan, 2007. "Hydrodynamic modelling of bottom currents and sediment transport in the Canyon São Tomé (Brazil)", Economic and Palaeoceanographic Significance of Contourite Deposits, A. R. Viana, M. Rebesco
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This study presents the hydrodynamic modelling of ocean currents along the Canyon São Tomé, Campos Basin, Brazil, and their impact on sediment transport. The objective is to develop a tool to simulate the interaction between bottom currents and the submarine physiography, and to depict the relative importance of any individual current forcing mechanism as a sediment-reworking agent. This paper presents the evolution of along-channel currents over a tidal cycle and the simulation of a turbidity current. The resultant sediment transport under the combination of turbidity and oceanic currents is also simulated. This model is a step forward towards the understanding of the geometric and textural modifications imposed by bottom currents upon gravity-driven deposits, which is of great importance for the oil industry.
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There has lately been a growth in the number and level of studies of contourite deposits. Most recent studies of contourites have two major lines of interest. One, propelled by the oil industry's continuous move into increasingly deep waters, concerns their economic significance. The other involves the stratigraphic/palaeoceanographic record of ocean circulation changes imprinted on contourite deposits that can be a key to understanding better the climate-ocean connection. The application of many different theoretical, experimental and empirical resources provided by geophysics, sedimentology, geochemistry, petrology, scale modeling and field geology are used in the 16 papers of this volume, proposing answers to those two main aspects. The papers are subdivided into two major categories (economic interest and stratigraphic/palaeoceanographic significance), with case studies ranging from well-documented drifts to new examples of modern and fossil series, involving a large diversity of geographic and physiographic scenarios worldwide.