Evaluation and Driving Force Analysis of Cultivated Land Quality in Black Soil Region of Northeast China

Chinese Geographical Science, Journal Year: 2023, Volume and Issue: 33(4), P. 601 - 615

Published: May 9, 2023

Cultivated land is an important natural resource to ensure food, ecological and economic security. The cultivated quality evaluation (CQE) greatly significant for protecting managing land. In this study, 320 counties in the black soil region of Northeast China (BSRNC) represent research units used construct CQE system measuring properties (SP), productivity (CLP), environment (EE) social economy (SE). total 19 factors were selected calculate integrated fertility index (IFI) divided into grades. Simultaneously, we coupling coordination degree model comprehensively analyze spatial pattern (CLQ) BSRNC, use structural equation (SEM) driving mechanism. results show following: 1) CLQ 262 BSRNC a state coordination, presents distribution 'high southwest northeast, low northwest southeast'. coordinated development 271 between 0.4 0.6, which transitional disorder. 2) generally good, with average grade 3. High-quality accounts 58.45% all counties, middle- upper-quality 27.05%, poor-quality 14.49%. 3) SEM analysis shows that SP, CLP, EE, SE influence CLQ. Among them, SP has largest force on CLQ, while smallest it. confirm main affecting are crop level, normalized difference vegetation index, ratio organic carbon content. When implementing protection measures considering balanced multiple systems reasonably controlling degradation important. This study provides current situation will play role governance utilization.

Language: Английский

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

International Journal of Sediment Research, Journal Year: 2023, Volume and Issue: 38(5), P. 673 - 697

Published: July 1, 2023

Language: Английский

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The modelling of river water contamination by tailings mudflows: The case of phosphorus in the Paraopeba River basin

Case Studies in Chemical and Environmental Engineering, Journal Year: 2024, Volume and Issue: 9, P. 100701 - 100701

Published: March 26, 2024

The Soil and Water Assessment Tool (SWAT) was used to assess total phosphorus concentrations (TOT-P) fluxes (TOT_P) in the Paraopeba River basin, located state of Minas Gerais, Brazil, following collapse tailings dam B1 Brumadinho. model calibrated validated for periods before (2000–2018) after (2019–2021) Brumadinho 25 January 2019, with great accuracy measured by various performance indicators (e.g., R2 ≈ 0.8). flow phosphorus-containing sludge from iron-ore explored Córrego do Feijão Mine Vale, SA, released break has impacted water through large increments TOT-P near site (60–100%, pre-rupture values varying between 0.06 0.1 mg/L). But other major sources were flagged, namely urban Betim region that raised 0.9 mg/L periodically during entire simulation period. study also revealed controls concentration coverage forests lowered down at 0.5–0.8 μg/L.km2. lowering rate was, however, dependent on occupation argisols. As per results, larger percentage argisols a will be surrounding courses, meaning are prone erosion leaching. A cluster analysis input terrain slope, soil type) output runoff) variables SWAT allowed relating surface- TOT_P underground-dominant hydrological processes, respectively runoff groundwater flow, linking them specific environmental such as steep slopes first case latosols smooth landscapes second case. management implications retrieved this holistic assessment discussed. Finally, checked against Brazilian standards. In regard, compared limits established Resolution 454/2012 National Environmental Council – CONAMA. Some sub-basins exhibited levels above legal threshold, contamination viewed systemic requiring immediate action implementation sewage treatment best practices agriculture), well monitoring spatial temporal frames. existence extreme rainfall events basin main cause inaccuracies, overestimated TOT-P.

Language: Английский

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Persistent metal and metalloid fluxes to the seafloor from an underlying mine tailings deposit 25 years after disposal off Portmán Bay (SE Spain)

Marine Pollution Bulletin, Journal Year: 2025, Volume and Issue: 214, P. 117803 - 117803

Published: March 14, 2025

Language: Английский

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Role of backwater effects on the attenuation of metal spreading in rivers: A study in the Paraopeba River after the B1 tailings dam collapse in Brumadinho

Case Studies in Chemical and Environmental Engineering, Journal Year: 2024, Volume and Issue: 9, P. 100740 - 100740

Published: April 26, 2024

The B1 tailings dam of Córrego do Feijão iron-ore mine Vale SA, located in the Ferro-Carvão stream watershed (Brumadinho municipality, state Minas Gerais, Brazil), collapsed 25 January 2019. This accident had unprecedent water resources management impacts Paraopeba River basin, parent stream, marked by suspension drinking supply to Metropolitan Region Belo Horizonte, which was decided after huge rise turbidity and metal concentrations aquatic environment, mostly iron manganese. authorities keep use downstream site prohibited today, entailed a number studies understand predict evolution spreading before envisaging any lift. One those is presented now purpose assess role weir 40 km from outlet, attenuation manganese fluxes. called Igarapé modeling dissolved using RiverFlow 2D software revealed 33.5-fold fluxes per unit length, 3062.0 g/yr.km upstream 91.4 downstream, under flows typical 10-year return periods. related with backwater effects that reduced flow velocities inundated banks during flood events, induced precipitation iron-bearing sand particles. not visible for because element preferably included silt clay particles were affected their small sizes (and hence weights). Our results corroborate previous outcomes highlighted capacity retain tailings, decelerating propagation opened time window remove large volume still deposited over river bed through dredging. monitoring eventual treatment also paramount seem be flooding.

Language: Английский

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Carbon footprints of tailings dams' disasters: A study in the Brumadinho region (Brazil)

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 949, P. 175026 - 175026

Published: Aug. 2, 2024

Tailings dams' breaks are environmental disasters with direct and intense degradation of soil. This study analyzed the impacts B1 tailings dam rupture occurred in Ribeirão Ferro-Carvão watershed (Brumadinho, Brazil) January 25, 2019. Soil organic carbon (SOC) approached degradation. The analysis encompassed wetlands (high-SOC pools) located so-called Zones Decreasing Destructive Capacity (DCZ5 to DCZ1) defined along Ferro-Carvão's stream bed banks after disaster. Remote sensed water indices were extracted from Landsat 8 Sentinel-2 satellite images spanning 2017-2021 period used distinguish other land covers. annual SOC was MapBiomas repository inside outside DCZs same period, assessed field 2023. Before collapse, maintained stable levels SOC, while afterwards they decreased substantially reaching minimum values reductions abrupt: for example, DCZ3 decrease 51.28 ton/ha 2017 4.19 Besides, increased near farther site, a result attributed differences percentages clay silt tailings, which also direction. as whole experienced slight reduction average nearly 43 38 2021. use changes related management namely opening accesses remove them valley, creation spaces temporary deposits, among others. Overall, highlighted footprints accidents on affect not only areas impacted mudflow but systemically surrounding watersheds. is noteworthy.

Language: Английский

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A framework for analyzing seawater intrusion in coastal areas: An adapted GALDIT model application for Espírito Santo, Brazil

Case Studies in Chemical and Environmental Engineering, Journal Year: 2024, Volume and Issue: 10, P. 100887 - 100887

Published: Aug. 7, 2024

This article introduces the GALDITE methodology, an adaptation of GALDIT used to assess seawater intrusion in coastal aquifers. incorporates a new parameter (E) focusing on groundwater exploitation through artesian wells, previously overlooked GALDIT. The methodology evaluates vulnerability using parameters like aquifer type, hydraulic conductivity, distance coastline, and now extraction impact. Statistical validation Barreiras data confirms effectiveness enhancing model accuracy. Sensitivity analysis highlights parameter's significant influence overall assessment. results indicate that key impact zones identified include downstream regions São Mateus, Doce, Itabapoana rivers, as well municipality Vitória, highlighting applicability GALDITE. utility managing water resources, governance, guiding sustainable strategies is emphasized, particularly face increasing risks exacerbated by intensive extraction. study underscores necessity integrating into assessments for effective management.

Language: Английский

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Geomorphologic risk zoning to anticipate tailings dams' hazards: A study in the Brumadinho's mining area, Minas Gerais, Brazil

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 912, P. 169136 - 169136

Published: Dec. 8, 2023

The use of tailings dams in the mining industry is recurrent and a matter concern given risk collapse. planning dam's emplacement usually attends construction design criteria site geotechnical properties, but often neglects installing depositional facilities potentially unstable landscapes, namely those characterized by steep slopes and(or) high drainage densities. In order to help bridging this gap, present study developed framework model whereby geomorphologic vulnerability assessed set morphometric parameters (e.g., density; relief ratio; roughness coefficient). Using Ribeirão Ferro-Carvão micro-basin (3265.16 ha) as test site, where six currently receive from iron-ore deposits Brumadinho region (Minas Gerais, Brazil) one has collapsed 25 January 2019 (the B1 dam Córrego do Feijão mine Vale, S.A.), instability derived was alternative suitable locations were highlighted when applicable. results made evident location five (including B1) high-risk regions two low-risk regions, which preoccupying. represent 58 % micro-basin, reasonable workable share. Overall, exposed fragility related with dams' geography, not restricted studied because dozens active exist parent basin Paraopeba River basin) that can also be vulnerable geomorphologically-dependent hydrologic hazards such intensive erosion, valley incision or flash floods. Attention issue therefore urgent prevent future tragedies breaks, elsewhere, using proposed guide.

Language: Английский

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Sediment source fingerprints of natural processes and anthropogenic pressures: A contribution to manage the Paraopeba River basin impacted by the B1 tailings dam collapse

Journal of Environmental Management, Journal Year: 2024, Volume and Issue: 356, P. 120590 - 120590

Published: March 23, 2024

Understanding the origins of sediment transport in river systems is crucial for effective watershed management, especially after catastrophic events. This information essential development integrated strategies that guarantee water security basins. The present study aimed to investigate rupture B1 tailings dam Córrego do Feijão mine, which drastically affected Brumadinho region (Minas Gerais, Brazil). To address this issue, a confluence-based fingerprinting approach was developed through SedSAT model. Uncertainty assessed Monte Carlo simulations and Mean Absolute Error (MAE). Estimates overall average contributions each tributary were quantified station annually during period 2019-2021. It observed sampling point PT-09, closest breach, contributed almost 80% Paraopeba River 2019. Despite dredging efforts, percentage increased 90% 2020 due need restore highly degraded area. Additionally, main tributaries contributing increase are Manso "TT-03" (almost 36%), associated with an area high urban land use, Cedro stream "TT-07" 71%), whose geology promotes erosion, leading higher concentration. Uncertainties arise from limited number available tracers, variations caused by activities, reduced data pandemic. Parameters such as riparian vegetation degradation, downstream basin geology, precipitation key factors successfully assessing River. obtained results promising preliminary analysis, allowing quantification areas erosion studying how disaster watershed. improving decision-making, environmental governance, mitigating measures ensure security. pioneering evaluating methodology watersheds disasters, where restoration efforts ongoing.

Language: Английский

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Attenuation of water contamination in the Paraopeba River after the collapse of B1 tailings dam: Natural wash-off and dredging contributions

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 937, P. 173407 - 173407

Published: May 24, 2024

Following the B1 dam collapse at Córrego do Feijão Mine, actions were taken to address environmental damage and enhance quality of water in Paraopeba River. Natural processes river involve gradual reduction contamination through dispersion downstream transportation tailings—a slow, nature-driven process. Dredging, a human intervention, aimed expedite recovery. Hence, this study explore dredging's role reducing impacted River zone. Analysis revealed direct link between dredging post-collapse turbidity, though recent trends suggest lessening impact on pre-collapse conditions. Distinct seasonal variations observed iron manganese concentrations, peaking during wet seasons displaying notable upstream-downstream disparities. An analysis ratios (downstream/upstream) was conducted understand even predict return Wet season averages for decreased by around 90 % over time, with standard deviations about 48 58 %, respectively. In dry season, 100 indicating improvements surpassing levels. Standard also significantly, approximately 67 79 Employing an exponential decay model that contribution period is negligible, but can be estimated 28.6 case 25 manganese. While models performed well based extensive data, some limitations occur estimating rates. The model's sensitivity might overlook influential factors, underscoring importance considering sediment nature dredged area extent understanding dynamics. Despite these potential limitations, investigation provides crucial insights into intricate relationship These findings pave way future studies deeper exploration more accurate assessments association.

Language: Английский

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