The effects of wind-wave disturbances on sediment resuspension and phosphate release in Lake Chao

The Science of The Total Environment, Год журнала: 2023, Номер 912, С. 169254 - 169254

Опубликована: Дек. 12, 2023

Язык: Английский

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Ecological threshold of phosphorus load in Baiyangdian Lake based on a PCLake model and ecological network analysis

The Science of The Total Environment, Год журнала: 2024, Номер 915, С. 170091 - 170091

Опубликована: Янв. 15, 2024

Ecological thresholds are a useful indicator for implementing ecological management. Many studies determine the nutrient loads in lakes based on maximum allowable concentration of chlorophyll (Chla), although this neglects overall performance ecosystem. A PCLake model Baiyangdian (BYD) Lake northern China was constructed with six network analysis (ENA) indicators that characterized ecosystem function, system maturity, and food web structure to quantify status BYD To my knowledge, is first study level responses phosphorus load interference. Different scenarios were designed simulate Lake. The simulated results employed calculate ENA indicators. determined through driving response relationship between gradient show non-linear transition under gradient. As increases, D/H, SOI, FCI decreases while A/DC, TPP/TR, TPP/TB increases. This indicates function will deteriorate if 0.50-1.32 mg m

Язык: Английский

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Threshold amounts of nutrients and the relationship with chlorophyll a during eutrophication phenomenon in small-scale artificial reservoirs

Environmental and Sustainability Indicators, Год журнала: 2024, Номер 22, С. 100378 - 100378

Опубликована: Март 15, 2024

This study aimed at determining the relationship of chlorophyll a (Chl a) and nutrients in two reservoirs different sizes, namely Bueng Si Than Thung Sang, which are located Khon Kaen Province Thailand. The evaluation trophic state index estimated threshold amounts was consequently considered. Water samples were collected during both dry rainy seasons with twenty-seven sampling points each reservoir. Parameters indicating water quality based on APHA method. results showed significant difference average physicochemical properties nutritional parameters smaller proportion, having more than Sang (p < 0.05). Nutrient factors (TP, TKN) impact occurrence eutrophication season season. Average ratios Chl together revealed hypertrophic conditions reservoirs. high value a:TP signaled that algal growth these could be controlled by TP. Pearson correlation analysis indicated strong positive TP Than. Moreover, obtained from simulation achieved using MATLAB R2022a, performed fourth order polynomial equation, boundary values 28.25–29.42 μg/L 4.15-4.19 mg/L for TKN prior to Eutrophic occurrence, ascertain further management small-scale artificial

Язык: Английский

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Influence of climate extremes on long-term changes in cyanobacterial blooms in a eutrophic and shallow lake

The Science of The Total Environment, Год журнала: 2024, Номер 939, С. 173601 - 173601

Опубликована: Май 27, 2024

Язык: Английский

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Distribution, relationship, and environmental driving factors of chlorophyll-a and algal cell density: A national view of China

Global Ecology and Conservation, Год журнала: 2024, Номер 54, С. e03084 - e03084

Опубликована: Июль 11, 2024

Chlorophyll-a (Chl-a) and algal cell density (ACD) are vital for assessing proliferation eutrophication in aquatic ecosystems. Although Chl-a is often used as a proxy ACD, its accuracy requires validation, studies on their linear correlation scarce. Additionally, ACD influenced by various factors, including nutritional, economic, biochemical, physicochemical, meteorological factors. However, the relative importance of these factors remains insufficiently studied. This study analyzed data from 57 lakes reservoirs across China March 2021 to February 2023, investigating distribution patterns different regions seasons. The employed regression model explore between seasons throughout China. Furthermore, Mantel test generalized were evaluated nutritional (total nitrogen (TN), total phosphorus (TP), TN/TP ratio (TN/TP), ammonia (NH3-N)), economic (gross domestic product), (surface pressure, net solar radiation, air temperature, wind speed (WS), rainfall (RF)), well biochemical physicochemical (turbidity (TUR), pH value, water temperature (WT), permanganate index, dissolved oxygen) ACD. Results showed that average concentrations South highest, at 12 μg/L 19.5 × 106 cells/L, respectively. Seasonally, peaked spring was lowest winter, while summer winter. Significant seasonal regional variations observed, with showing strongest relationship. In Central China, significantly correlated four seasons, whereas correlations less distinct Eastern Western regions. Therefore, caution. Nutrient (TN, TP, TN/TP, NH3-N) identified primary drivers Meteorological (WS, RF), along (WT, TUR) also emerged critical predictors spatial variations. validates analyzes spatiotemporal distribution, assesses influence enhancing our understanding dynamics Chinese reservoirs.

Язык: Английский

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Quantifying marginal utilities of ecosystem services for sustainable management

Journal of Cleaner Production, Год журнала: 2024, Номер 470, С. 143353 - 143353

Опубликована: Авг. 5, 2024

Язык: Английский

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Prediction of Future Chlorophyll‐a Concentrations in Large Eutrophic Shallow Lakes Under Multiple Stressors

Earth s Future, Год журнала: 2025, Номер 13(5)

Опубликована: Май 1, 2025

Abstract Assessing future chlorophyll‐a (Chl‐a) changes is crucial for developing effective lake management programs. Future assessments should integrate socio‐economic and climatic factors, including extreme climate impacts. However, such are lacking. This study developed a novel framework integrated model to analyze Chl‐a response in Chaohu Lake (e.g., precipitation, temperature, wind) population, fertilizer application, livestock farming). The results indicated that by around 2050, the concentration would change −6.5% −0.1% compared 2020. While factors significantly altered nitrogen phosphorus loading, exogenous loading had minimal effect on due high endogenous releases. decrease mainly increase precipitation. reduction was primarily driven increased precipitation (0.6%–12.9%), leading −9.4% −4.4% changes. runoff also provided an opportunity treat heavily polluted area. Air temperature increases of 5.1%–9.2% resulted 0.9%–3.1%. On annual scales effects were mean values. variability significant at seasonal scales, example, lower spring temperatures favored summer Chl‐a. There uncertainty about impact wind speeds. emphasized importance comprehensively quantifying impacts external pressures water quality assessment reference pathway support large, shallow lakes.

Язык: Английский

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Forecasting Chlorophyll-a in the Murray–Darling Basin Using Remote Sensing

Remote Sensing, Год журнала: 2025, Номер 17(10), С. 1684 - 1684

Опубликована: Май 10, 2025

Reliable forecasts of large-scale chlorophyll-a (Chl-a) levels one week ahead in the Murray–Darling Basin are essential for water resources management, as increasing Chl-a bodies indicate possible harmful algal blooms, a serious threat freshwater security. A lack high-resolution data space and time is major constraint delivering early warnings. To address scarcity, we developed forecasting model integrating remote sensing time-series modelling. Using situ measurements from bodies, locally recalibrated two-band ratio algorithm, namely Normalized Difference Chlorophyll Index (NDCI), Sentinel-2 to derive levels. The significantly improved accuracy high estimates our dataset after mitigating heteroscedasticity. Building on these satellite-derived estimates, weekly including quantification forecast uncertainty through prediction intervals. model, validated at eight sites 2021–2022 data, performed well shorter lead times, showing R2 = 0.41 RMSE 8.1 μg/L overall performance one-week time. intervals generally aligned with nominal levels, demonstrating their reliability. This study provides valuable tool managers/decision-makers issue warnings blooms Basin.

Язык: Английский

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Agricultural Pressures on the Quality of Ground and Surface Waters in Catchments of Artificial Reservoirs

Water, Год журнала: 2023, Номер 15(4), С. 661 - 661

Опубликована: Фев. 8, 2023

Changes in nutrient concentrations groundwater were investigated to determine the impact of agriculture on water quality artificial lakes. The study covered three reservoirs an agricultural area Wielkopolska (central-western part Poland). Assessing required a network piezometers around reservoirs, used degree pollution from nutrients supplied reservoirs. Moreover, analysis streams flowing into and themselves. Field research was conducted every month growing season March November. land inclination, ground permeability, soil type. Detailed objectives included: (1) assessment chemical parameters surface quality, (2) evaluation different sources regards their management. This revealed high dynamics concentrations, particularly for nitrates phosphates, water. A significant effect maize cultivation increase nitrate catchment Przebędowo Reservoir evidenced, as well substantial functioning animal farm groundwaters Lachotka Reservoir. load origin Miedzichowo relatively low. Our elevated amounts such nitrogen phosphorus, detected more frequently than running waters, which confirms our hypothesis importance detecting source studied High recorded leached arable fields also observed summer period, failing confirm that greatest factors would be related spring (lack compact vegetation cover, level, etc.). indicated greater type use lithology or permeability deposits.

Язык: Английский

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Analysis of future nitrogen and phosphorus loading in watershed and the risk of lake blooms under the influence of complex factors: Implications for management

Journal of Environmental Management, Год журнала: 2023, Номер 345, С. 118662 - 118662

Опубликована: Июль 20, 2023

Язык: Английский

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