Caracterização hidrodinâmica e sedimentar do estuário furo do Muriá, Curuça-PA.

Abstract

The Amazon region presents hydrographic elements in which a "furo" is characterized as a channel that connects rivers. The furo of Muriá is dominated by an extremely dynamic macromaréado regime. In this, the study of abiotic parameters and sediments are comparatives of great importance for the aquatic system, since they reflect the processes that occur in a water column, acting as an important tool to evaluate the integrity of the aquatic ecosystems. In this context, the present study aims to contribute to the local scientific knowledge through the characterization in the furo of Muriá by determining the objective abiotic oceanographic and sedimentological analysis of the surface sediments in addition to a statistical evaluation in the distribution of variables in the area of study . As samples of sediments were collected in the intertidal zone of the tide in the furo of Muriá, quarterly (March, June, September and December) in 2015 in 14 points, totaling 56 samples. The results showed that the morphology of the wall is a feature that characterizes the medium depths, the coarse sediments and the rocky outcrops and that the granulometry of the superficial sediment samples is predominantly composed of silt and clay fractions, but with a great representativeness of the sand fraction. The hydrodynamics of the area is classified as high to very high, with granulometric attributes of the sandy silt type. (19.98% to 76.86%) and clay (4.19% to 25.42%), but with a representative sand fraction (25.04% to 73.15%). The organic matter contents (2.60% to 16.43%) are characteristic of mangroves and favor the presence of aquatic organisms and influence carbonate (2.51% to 15%). The furo of Muriá is a dynamic environment, controlled by hydrodynamics and its morphology influence sediment composition.