The Effects of Different Hydrodynamic Formulations on Computed Tidal Propagation and Circulation in the Eastern Scheldt

by Jan J. Leendertse, Susan L. Ritter

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This Note is one of a series documenting experiments conducted to resolve questions about the accuracy of two-dimensional models, the consequences of certain of their assumptions, and the adequacy of the numerical approximation procedures. The experiments and computations with a model of the Eastern Scheldt demonstrate that the omission of the pressure gradient computed from the salinity gradient increases semi-diurnal tidal amplification by a few percent over the section of the estuary where significant salinity gradients are present. The quarter-diurnal and sixth-diurnal tidal amplifications are reduced. Using the pressure gradient computed from the salinity gradient increases the mean water levels and has some influence on residual circulation, but it does not influence the general circulation pattern in the estuary.

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