Source identification and prediction of nitrogen and phosphorus pollution of Lake Taihu by an ensemble machine learning technique

Frontiers of Environmental Science & Engineering, Год журнала: 2022, Номер 17(5)

Опубликована: Ноя. 21, 2022

Язык: Английский

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Climate-driven decline in water level causes earlier onset of hypoxia in a subtropical reservoir

Water Research, Год журнала: 2024, Номер 267, С. 122445 - 122445

Опубликована: Сен. 14, 2024

Язык: Английский

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Patterns of internal nitrogen and phosphorus loadings in a cascade reservoir with a large water level gradient: Effects of reservoir operation and water depth

Journal of Environmental Management, Год журнала: 2022, Номер 320, С. 115884 - 115884

Опубликована: Авг. 5, 2022

Язык: Английский

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Predicting anoxia in the wet and dry periods of tropical semiarid reservoirs

Journal of Environmental Management, Год журнала: 2022, Номер 326, С. 116720 - 116720

Опубликована: Ноя. 8, 2022

Язык: 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, Год журнала: 2024, Номер 9, С. 100701 - 100701

Опубликована: Март 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.

Язык: Английский

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Diel and seasonal mixing patterns and water quality dynamics in a multipurpose tropical semiarid reservoir

Environmental Science and Pollution Research, Год журнала: 2024, Номер 31(30), С. 43309 - 43322

Опубликована: Июнь 20, 2024

Язык: Английский

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Environmental impacts of floating solar panels on freshwater systems and their techno-ecological synergies

Environmental Research Infrastructure and Sustainability, Год журнала: 2024, Номер 4(4), С. 042002 - 042002

Опубликована: Ноя. 4, 2024

Abstract Renewable energy sources, such as floating photovoltaic systems (FPVs), are crucial to mitigating the climate crisis. FPV deployments on freshwater bodies rapidly growing, they avert land-use change, operate with increased efficiency, and potentially improve water availability by reducing evaporation frequency of algal blooms. However, understanding ecological consequences for is very limited despite variable far-reaching range potential impacts. Here, we bring novel insight combining an established theoretical approach—techno-ecological synergies (TES)—with robust body functioning, direct sustainable deployments. Specifically, show integrate consideration both deployment decisions based current evidence fundamental states processes. Based 422 pieces from a systematic review known physical ( n = 283), chemical 96) biological 43) effects systems, outline eight TES that could be realised through location, design, operation decisions. There was most 114) Water Use Efficiency TES, which all reported decreased rates, or savings, due panel shading. We highlight lack hosting bodies, well need comprehensive studies in physical, chemical, aspects dynamics integrated. Finally, detail research priorities ensure future benefit bodies. Ultimately, integrated system knowledge, mitigate emergencies, notable benefits society.

Язык: Английский

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Determination of the Total Phosphorus Decay Coefficient Based on Hydrological Models in an Artificial Reservoir in the Brazilian Semi-Arid Region

Hydrology, Год журнала: 2025, Номер 12(2), С. 36 - 36

Опубликована: Фев. 16, 2025

Phosphorus input into surface water is a global concern due to its role in eutrophication, which especially critical semi-arid regions with their challenging climatic conditions. This study evaluated the best model for estimating phosphorus decay coefficient (k) lakes, using flows from Soil Moisture Accounting Procedure (SMAP), of Génie Rural à 4 paramètres Journalier (GR4J), and reverse balance hydrological models. Conducted at Orós reservoir 37 sampling campaigns 2008 2017, it compared rates temperate, tropical, climates. Some analyses also used concentrations measured inlet. Model efficiency was assessed bias, mean relative error, squared root standard deviation. models, quality classes were classified based on use confusion matrix calculate accuracy, precision, recall, F1 score. The findings demonstrated that rate tailored regions, when combined GR4J flow data, offered highest accuracy (bias = 0.0012, RMSE 0.0326, EMR 60.6134, STD 0.0312). In contrast, calibrated tropical conditions SMAP-derived proved superior classifying categories (classes defined by CONAMA Resolution 357/05). Therefore, stands out concentration estimation, while SMAP preferable effective classification status.

Язык: Английский

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The impacts of the water intake operation on the hydraulic transients, sediment resuspension and water quality of the largest multi-use reservoir in Latin America

RBRH, Год журнала: 2025, Номер 30

Опубликована: Янв. 1, 2025

ABSTRACT This study investigates numerically the effects of water intake operation Castanhão reservoir, Ceará, Brazil. First, transient hydraulic modelling was carried out using ALLIEVI. The results indicated that, even for fastest closing conditions valve, impact transients negligible. Next, computational fluid dynamics (CFD) simulations were performed FLUENT to investigate induced flow patterns approaching intake. With turbulence values obtained, an empirical model as a function turbulent kinetic energy applied assess thresholds sediment resuspension. showed that converging towards generated enough at bottom reservoir resuspend sediment. However, longitudinal extent resuspension limited areas relatively close Finally, CFD under well-mixed and thermally/chemically stratified different withdrawal rates. For low rates, most withdrawn from upper layers. Contrastingly, high significant also lower As result, quality parameters outlet increased up about 30% conditions.

Язык: Английский

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Reservoir eutrophication in the Brazilian semiarid: modeling of sediment removal and control of external loads as remediation measures

Environmental Science and Pollution Research, Год журнала: 2025, Номер 32(12), С. 7663 - 7679

Опубликована: Март 5, 2025

Язык: Английский

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