Tidal and current prediction for the Amazon's North Channel using a hydrodynamical-numerical model
Ferraz, Luiz Antonio de Carvalho
Tucker, Stevens P.
Thornton, Edward B.
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The hydrodynamical-numerical prediction model developed by W. Hansen is applied to the North Channel of the Amazon River for computation of tides and currents; the results are compared with tidal prediction obtained by the harmonic method and to actual current measurements. A medium size grid of square mesh cells, 1800 m in length, represents the North Channel. The driving forces are the tides at the northern opening of the channel near the river's mouth and the river discharge into the channel at the southern end. The numerical results for tides were verified at three tidal stations, and it was observed that the tides predicted at the northern part of the channel agreed, in the worst case, within 12% of the tidal range, but those predicted at the southern end were unsatisfactorily reproduced. This fact is attributed to the size of the grid which is too coarse to describe adequately the variable and irregular cross-sections and bottom topography at the southern part of the channel. The predicted currents were in acceptable agreement with the few available measurement.
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