Applying multivariate techniques to fingerprint water quality impact of the Fundão Dam breach within the Rio Doce basin

Oehrig, Jacob; Kananizadeh, Negin; Wild, Michael; Rouhani, Shahrokh; Odle, William

doi:10.1002/ieam.4820

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…These analyses demonstrate that, for all metals, there were statistically significant higher concentrations or statistically indistinguishable levels found in at least one reference area or a commercially available seafood market when compared to fish and crustaceans collected in the Fishing Ban Area. These results also corroborate those of Kananizadeh et al (2023) [4] which determined that, after 2017, water quality results collected in marine waters near the Rio Doce mouth were statistically indistinguishable from those near other rivers.…”

Section: Resultssupporting

confidence: 87%

Comparative Analysis of Metals in Seafood from Rio Doce Coastal Areas and Regional Fish Markets

Odle,

Da Silva,

Marques

et al. 2023

JEP

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On November 5, 2015, the Fundão Dam breached (the "Event"), releasing water, tailings, dam construction material, and debris to downstream watercourses. Over 20 million cubic meters of fine particles from the tailings, as well as scoured soil and sediments, reached the Rio Doce estuary and surrounding marine area 17 days later. Fishing was banned by the Federal Court of Espírito Santo in February 2016. The fishing ban area included the coastal area near the mouth of the Rio Doce and seaward to a depth of 25 meters, south to Barra do Riacho, and north to Degredo Beach. In June 2019, the Brazilian health agency, Anvisa, published a risk assessment for fish consumption which recommended daily consumption limits for fish of 200 grams for adults and 50 grams for children for both continental and coastal areas of the Rio Doce basin. Comparative analyses were performed between metal concentrations in marine fish and crustaceans collected in the banned fishing area to reference areas and commercialized seafood markets along the Brazilian coast. The results reveal that metals detected in seafood tissue collected in the fishing ban area are not significantly different than other reference areas or from commercially available seafood. This result indicates that elevated metal concentrations in seafood are a regional problem, unrelated to the Event. Higher concentrations of metals in fish in reference areas outside of the fishing ban area as well as in commercial seafood markets demonstrates that the risk management approach of a localized fishing ban is ineffective for reducing risk to the population related to seafood consumption.

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Section: Resultssupporting

confidence: 87%

Comparative Analysis of Metals in Seafood from Rio Doce Coastal Areas and Regional Fish Markets

Odle,

Da Silva,

Marques

et al. 2023

JEP

Self Cite

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“…The accumulation of information on sediment quality and quantity in the Rio Doce catchment and coastal areas over the additional three years after the first meeting meant that more detailed analyses of rates of system recovery were able to be made (Oehrig et al, 2023). This better understanding also enabled better planning of restoration of affected floodplains.…”

Section: Sediment Geochemistrymentioning

confidence: 99%

Second Fundão Dam Rupture Science Meeting: Updating the science

Smith,

Furley,

de Souza Abessa

et al. 2023

Integr Envir Assess & Manag

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The second Fundão Dam Rupture Science Meeting was held in Ouro Preto, Minas Gerais, Brazil, on 21 and 22 September 2022. A total of 100 delegates attended the meeting, which featured high‐quality oral presentations and posters over the two days and lively discussions of the science presented. The meeting resulted in nine papers being published in this special series. In the discussion, it was commented that the first meeting had been more a meeting of competitive perspectives but that the second meeting featured a more collaborative sharing of knowledge. Also, there had been substantial improvement in ways to deal with the lack of pre‐event data and account for other stressors in the system, and as a result, stronger conclusions regarding the recovery rates of the system were able to be made. Importantly, there was no evidence for a feasible “time bomb” of a future catastrophic release of contaminants, but it was agreed that different scenarios continue to be researched. Integr Environ Assess Manag 2024;20:70–73. © 2023 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC).

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Water quality emergency monitoring networks: A method for identifying non-critical variables based on Shannon's entropy

Cruz,

Silva

2024

Journal of Hydroinformatics

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In the occurrence of environmental disasters involving water resources, deploying an emergency monitoring network for assessing water quality is within the first measures to be taken. Emergency networks usually cover a large set of water quality variables and monitoring stations along the watershed. Focusing on variables that represent greater risk to the environment and have less predictable spatial and temporal distribution is a strategy to optimize efforts on monitoring. The goal of this study is to assess the use of Shannon's entropy to identify non-critical water quality variables in an emergency monitoring network implemented in a watershed impacted by the collapse of a mining iron tailing dam, the Doce River watershed (Brazil). Monitoring stations were grouped into water quality subregions through cluster analysis and Shannon's entropy was used to estimate information redundancy of monitored variables. From information redundancy and after checking for compliance with environment normative, non-critical water quality variables were identified. Results indicated that non-critical variables represent 32–50% of the variables monitored. Emergency network managers find in this method a robust tool to improve the network performance. However, special attention should be paid to outliers' presence that can bias analyses based on Shannon's entropy.

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Applying multivariate techniques to fingerprint water quality impact of the Fundão Dam breach within the Rio Doce basin

Cited by 3 publications

References 16 publications

Comparative Analysis of Metals in Seafood from Rio Doce Coastal Areas and Regional Fish Markets

Comparative Analysis of Metals in Seafood from Rio Doce Coastal Areas and Regional Fish Markets

Second Fundão Dam Rupture Science Meeting: Updating the science

Water quality emergency monitoring networks: A method for identifying non-critical variables based on Shannon's entropy

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