The Igarapé Weir decelerated transport of contaminated sediment in the Paraopeba River after the failure of the B1 tailings dam(Brumadinho)  

作　　者：Daniela Patrícia Salgado Terencio Fernando Antonio Leal Pacheco Renato Farias do Valle Junior Mayte Maria Abreu Pires de Melo Silva Teresa Cristina Tarle Pissarra Marília Carvalho de Melo Carlos Alberto Valera Luís Filipe Sanches Fernandes 

机构地区：[1]Inov4Agro/Centro de Investigaçao e Tecnologias Agroambientais e Biologicas,Universidade de Tras-os-Montes e Alto Douro,Ap 1013,5001-801 Vila Real,Portugal [2]Centro de Química de Vila Real,Universidade de Tras-os-Montes e Alto Douro,Ap 1013,5001-801 Vila Real,Portugal [3]Faculdade de Ciencias Agrarias e Veterinarias,Universidade Estadual Paulista(UNESP),Via de Acesso Prof.Paulo Donato Castellane,s/n,Jaboticabal,SP 14884-900,Brazil [4]Instituto Federal do Triangulo Mineiro,Campus Uberaba,Laboratorio de Geoprossessamento,Uberaba,MG 38064-790,Brazil [5]Secretaria de Estado de Meio Ambiente e Desenvolvimento Sustentavel,Cidade Administrativa do Estado de Minas Gerais,Rodovia Joao PauloⅡ,4143,Bairro Serra Verde-Belo Horizonte e Minas Gerais,Brazil [6]Coordenadoria Regional das Promotorias de Justiça do Meio Ambiente das Bacias dos Rios Paranaíba e Baixo Rio Grande,Rua Coronel Antonio Rios,951,Uberaba,MG 38061-150,Brazil

出　　处：《International Journal of Sediment Research》2023年第5期673-697,共25页国际泥沙研究（英文版）

基　　金：supported by National Funds of FCT e Portuguese Foundation for Science and Technology(Project No.UIDB/04033/2020).

摘　　要：The B1 dam of Corrego do Feijao Mine,owned by Vale,S.A.mining company and located on the Ferro-Carvao stream,collapsed and injected 2.8 Mm^(3)of clayey,silty,and sandy iron-and manganese-rich tailings into the Paraopeba River(Minas Gerais state,Brazil).The accident occurred on 25 January 2019 and the tailings have been co-transported with coarser natural sediment since then,being partly trapped in the Igarape Weir reservoir located on the Paraopeba River nearly 45 km downstream the injection point.The general purpose of the current study was to model suspended sediment transport in the vicinity of the Igarape Weir aiming to assess the concomitant barrier effect imposed by this structure.Specifically,the spatial distributions of suspended clay,silt,and very fine-grained sand fractions(CSS)of sediment were mapped around the Igarape Weir under low-flow(16 m^(3)/s)and high-flow(5 to 10,000 years return period stream discharge;699e2,699 m^(3)/s)regimes,using RiverFlow2D as the modelling tool.The concentrations of the various grain materials in the upstream and downstream sectors were quantified linking the barrier effect to concentration reductions in the direction of stream flow.It was also a study goal to calculate differences of iron and manganese concentrations in the sediment+tailings mixtures along the Paraopeba River.The study results showed reductions in the CSS between 6.6%and 18%,from upstream to downstream of the Igarape Weir,related with backwater effects,free and sub-merged hydraulic jumps,bank sedimentation in periods of high flow,and streambed sedimentation controlled by channel sinuosity and tailings density.These reductions were accompanied by drops in the concentrations of iron and manganese present in the clay and silt fractions,which varied between 6%and 42%under low flows and between 16%and 44%under high flows.Bank sedimentation was viewed as a potential threat to the riparian vegetation in the long-term.Dredging is the potentially most effective mitigation measure to help lead the Paraopeba River

关 键 词：Sediment transport Tailings dam break Metal contamination Hydrodynamic modelling RiverFlow2D Ratio concentration analysis 

分 类 号：X143[环境科学与工程—环境科学]