The role of waves in the resuspension and transport of fine sediment and mine tailings from the Fundao Dam failure, Doce River, Brazil  

作　　者：Susana Beatriz Vinzon Marcos Nicolas Gallo Mariela Gabioux Diego Luiz Fonseca Fernanda Minikowski Achete Renato David GhisolfI Guilherme Nogueira Mill Sabrina Aparecida Ramos da Fonseca Valéria da Silva Quaresma Kyssyanne Samihra Santos Oliveira Guilherme Brigagão Léo Gonçalves Machado 

机构地区：[1]Cohesive Sediment Dynamics Laboratory(LDSC),Federal University of Rio de Janeiro,Rio de Janeiro,21941-909,Brazil [2]Department of Environmental Engineering.Federal Center for Technological Education Celso Suckow da Fonseca(CEFET/RJ).Rio de Janeiro,20271-204.Brazil [3]Laboratory of Oceanography,Department of Oceanography,Federal University of Espirito Santo,Vitoria,29075-910,Brazil [4]Marine Geosciences Laboratory,Department of Oceanography,Federal University of Espirito Santo,Vitória,29075-910,Brazil

出　　处：《International Journal of Sediment Research》2024年第1期44-60,共17页国际泥沙研究（英文版）

摘　　要：In one of the world's worst mining disasters,after flowing 670 km down the Doce River,about 20 million m3 of tailings reached the coast of Brazil in November 2015.The occurrence of persistent northerly winds favored the detachment of the river plume from the coastline and its displacement southward.However,observations of the sediment plume along the coast during the year following the breach,using aerial photographs,indicated that the plume is more extensive and persistent in a northerly direction.Previous studies have shown that although the most persistent winds are from the northern sector(70%),there is a greater incidence of waves from the southern sector(62%),especially with greater heights and periods.In this research,the effect of gravity waves on the transport of sediments is investigated,and,therefore,tailings from the Doce River and deposited on the adjacent inner continental shelf,mixed with the fluvial mud deposit also are investigated.Two mechanisms were investigated:1)the effect of waves on sedi-ment resuspension and their combination with tidal and wind forcings,using a two-dimensions in the horizontal directions(2DH)numerical model within the DELFT3D software,and 2)the capture of the fluvial plume by littoral drift,calculated by means of analytical models using data from wave propagation modeling.Both mechanisms were studied for 2019,also considering two major meteorological events in the region.Both effects were relevant for the northward dispersion of fine sediment,highlighting the effect of waves on the potential for northward transport of tailings towards the Abrolhos Bank.

关 键 词：Sediment plume Waves Littoral drift Doce River 

分 类 号：TV14[水利工程—水力学及河流动力学]