Comparative hydrodynamics of a sub-tropical salt-wedge estuary and a tributary
DOI:
https://doi.org/10.1590/2675-2824069.20-027maacKeywords:
Itajaí-Mirim, Itajaí-Açu, Advective salt transport, Estuarine circulationAbstract
The objective of this study is to compare the physical characteristics of circulation, salinity structure and transport in the
Itajaí-Açu and Itajaí-Mirim estuaries. Due to its importance, the Itajaí-Açu estuary has been studied in the last decade.
However, its main tributary, the Itajaí-Mirim has never been assessed, especially as an opportunity to comparatively
investigate the flow behavior of salt wedge estuaries with different widths and depths. Field data were acquired during two
campaigns that covered the complete semi-diurnal tidal regimes during spring and neap tides. Water level, total transport
volume, current and salinity were recorded hourly and synoptically at cross-sections in each estuary. The campaigns were
conducted during a prolonged period of low river discharge. The tidal range during the spring and neap tide campaigns
were of approximately 1.2 and 0.4 m, respectively. At the Itajaí-Açu and Itajaí-Mirim cross-sections, the peak ebb and flood
currents were -0.8 and -0.6 m s-1 and 0.8 and 0.4 m s-1, respectively, during the spring tide campaign, and classified as
well mixed and highly stratified estuaries, respectively. During the neap tide campaign, both estuaries were classified as
salt wedge. The dominant mechanism was the salt transport by advection due to fluvial advection in both estuaries and
campaigns. The landwards salt transport, which resulted from dispersive processes, was only important during neap tide
for the Itajaí-Açu estuary.
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