Hydrodynamic connectivity between two macrotidal Amazonian estuaries

Abstract

ABSTRACT Araujo Jr., W.P. and Asp, N.E., 2013. Hydrodynamic connectivity between two macrotidal Amazonian estuaries The hydrodynamic connectivity between the Taperacu and the Caete estuaries at the east sector of the Amazon Coastal Zone, through the Taici channel was investigated. Water levels, currents, salinity and suspended solid concentration (SSC) were measured at both ends and at the middle of the channel. The measuring campaigns were carried out during neap and spring tides, including also the wet and dry seasons. The results have showed a strong tidal asymmetry, with ebb phases lasting approx. 40% longer than the flood. On the other hand, the flood phase is longer and takes place first and reaches higher levels at the Caete side in comparison to the Taperacu side, despite neap/spring or wet/dry variations. During the wet season the depth-integrated ebb current velocity reached 1.5 m.s−1 at the Taperacu side and 1.4 m.s−1 at Caete side, whereas during the flood it reached 0.9 and 0.8 m.s−1 at Taper...