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- W2512165873 abstract "Bertioga Channel is a partially mixed (type 2) tidal estuary on the coastal plain of Sio Paulo, Brazil. Hourly current and salinity measurements during neap and spring tides in July 1991 yielded information about the physical structure of the system. Peak along-channel velocities varied from 40 cm s-1 to 60 cm s-1 during flood tides and from 70 cm s-1 to 100 cm s-1 during ebb tides. Net vertical velocity profiles indicate that the net current reverses directions at a depth of 2.5-3.0 m in the halocline. Due to appreciable fortnightly tidal modulation, the estuary alternates from being highly stratified (type 2b) during neap tides, with advection and diffusion contributing equally to the net upstream salt flux, to being moderately stratified (type 2a) during spring tides, when 90% of the net upstream salt transport is the result of effective tidal diffusion. Decomposition of the salt flux indicates that the relative contribution to the upstream salt transport by gravitational circulation shear is greater than the oscillatory tidal flux by a factor of 2.6 during neap tides. The oscillatory tidal flux is generated by the correlation of the tidal components of the u-velocity and salinity and is responsible for approximately the same amount of upstream salt transport during neap and spring tides. However, during spring tides, this oscillatory term is greater than the other salt flux terms by a factor of 1.4. The total salt transport, through a unit width of the section perpendicular to the flow, was within 2% of the sum of the seven major decomposed, advective and dispersive terms. On the assumption that the Bertioga Channel is laterally homoge- neous, the results also indicate that the estuary is not in steady state with respect to salt flux." @default.
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- W2512165873 date "1998-01-01" @default.
- W2512165873 modified "2023-10-17" @default.
- W2512165873 title "Circulation and Mixing Due to Tidal Forcing in the Bertioga Channel" @default.
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