Avaliação do efeito do assoreamento na hidrodinâmica e no tempo de residência de um complexo estuarino lagunar tropical

Abstract

The residence time of water bodies is a particularity that quantifies the renewal time. Several studies using the modeling have been carried out with the purpose of quantifying residence time and evaluation as hydrodynamic characteristics, through the trajectory of particles. The objective of this study was to evaluate how changes in residence time and hydrodynamics of a coastal estuarine complex under accelerated sedimentation process, comparing bathymetric surveys with 27 years of difference. For that, the method of particle racking of the hydrodynamic module of the IPH-ECO model was used. As a result, the model showed that with a less restricted input and volume decrease, the bottom friction effect is lower, increasing the tide prism in the channels and velocity of exchange between lagoons and the ocean, thus reducing the residence time and recirculation.