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Worldwide harbors are settled inside estuarine areas due the protection function of these environments against oceanic waves and therefore are subjected to the hydrodynamic processes that provide morphodynamic changes in sediment distribution and bed evolution. Understanding the dynamic of sediments and the bed evolution at estuaries is of crucial importance on maintenance of fairways and harbor docks. The aim of this study is to model the suspended and cohesive sediment transport at the Patos lagoon estuary, southern Brazil, from 2003 to 2007, in order to point out the possible problems that sediment transport can cause at the harbor zone of Rio Grande. Therefore, a hydrodynamic model, TELEMAC 3D, and a morphodynamic, Sisyphe, were applied in order to acquire the bed evolution and sediment distribution of the area using different data sources for the oceanic, atmospherical and continental boundary conditions. The results show that clay is being deposited at deeper parts of the channel. Bed evolution results indicate siltation process where silt is being deposited. Sedimentation rates were calculated based on the bed evolution results.

MID TERM SIMULATION OF SUSPENDED SEDIMENT TRANSPORT AND BED EVOLUTION FOR THE PATOS LAGOON ESTUARY