INFLUÊNCIA DOS VENTOS NA DISPERSÃO DA PLUMA DE REJEITOS DE MINÉRIO DE FERRO APÓS O ROMPIMENTO DA BARRAGEM DE FUNDÃO

Código

PAP108

Autores

Franciélli de Paula Dela Costa, KAIO CALMON LACERDA, Franciane Entringer Curbani, JULIO TOMÁS AQUIJE CHACALTANA

Tema

MEDIÇÃO, MODELAGEM, TÉCNICAS E TECNOLOGIAS NO CONTEXTO DA HIDROSSEDIMENTOLOGIA

Resumo

The Fundão dam failure on 5 November 2015 release 60 million cubic meters of iron ore tailings to the environment in Mariana, MG-Brazil. The ore waste overflowed of Santarémdam and flowed mainly by the Doce River until it reaches on 21 November the coastal water of Espírito Santo state through the Doce River mouth. The goal of this work is to understand the role of the marine ambient flow on the plume of ore leach residue released into the coastal water through the DoceRivermouth and its dispersion into the marine environment by using the Computational Fluid Mechanics technique. The ambient flow is forcing by the volumetric flux of the river, by the astronomical tide and by the wind blowing at the sea surface. The ore waste is considered as a completely diluted substance in the river water and it is given as the concentration of dissolved solids. The Delft3D hydrodynamic model is used to hindcast the ore waste plume and its dispersion into the marine environment for the simulation period from November 2015 to February 2016. The numerical results of water wave displacement were recorded and compared with the six principal harmonic components provided by FEMAR in ports located in the study area. It was found good agreement,with relative mean absolute error less than 26% (0,26) for the amplitudes and 20% (0,20) for the phases. The circulation over the continental shelf is strongly influenced by the winds, as expected for the wind pattern, the current is predominantly towards the south. The dispersionof the plume is towards the southof the Doce River mouth near the coast due to the prevailing Northwest (NW) and Northeast (NE) winds.