Evaluating impacts of climate and management on reservoir water quality using environmental fluid dynamics code

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 947, P. 174608 - 174608

Published: July 10, 2024

Language: Английский

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Warming accelerated phosphorus release from the sediment of Lake Chaohu during the decomposition of algal residues: A simulative study

PLoS ONE, Journal Year: 2025, Volume and Issue: 20(1), P. e0314534 - e0314534

Published: Jan. 15, 2025

Algal decomposition plays an important role in affecting phosphorus (P) release from sediments eutrophic lakes under global warming. Yet how rising air temperature affect endogenous P during the algal is poorly understood. In this study, effect of increasing on was investigated. A 22-day laboratory warming simulation experiment conducted, with overlying water and collected Lake Chaohu incubated microcosms at three temperatures (21, 28 37°C). Dynamics fractions related physiochemical properties were measured, rate calculated. Rising significantly reduced redox potential, but elevated pH, dissolved organic carbon (C) alkaline phosphatase activity water. For average value incubation, soluble reactive by 3 times water, greatly total (by 19.0%) sediments, while did not inorganic sediments. The NH 4 Cl-Po NaHCO -Po concentrations showed greatest decrease (accounting for 97.6% decrease) experiment. rate, P, C incubation also differed among different temperatures. negatively correlated potential all temperatures, sediment 21°C, 37°C. results revealed that strongly stimulated decay residues, which mainly due to acceleration mineralization Warming-induced changes amount dynamics played dominant accelerating

Language: Английский

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Spatiotemporal Variations in Water Quality Parameters and Assessment of the Current Status and Challenges of Eutrophication in Lake Dian

Published: Jan. 1, 2025

Language: Английский

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Linking sediment geochemistry with catchment processes, internal phosphorus loading and lake water quality

Water Research, Journal Year: 2024, Volume and Issue: 263, P. 122157 - 122157

Published: July 26, 2024

Research in the field of sediment geochemistry suggests potential linkages between catchment processes (land use), internal phosphorus (P) loading and lake water quality, but evidence is still poorly quantified due to a limited amount data. Here we address issues based on comprehensive data set from 27 lakes southern Finland. Specifically, aimed at: 1) elucidating factors behind spatial variations geochemistry; 2) assessing impact diagenetic transformation P regeneration across changes vertical distribution components; 3) exploring role forms (IL), 4) determining IL quality. The relationship concentration area percentage (FA%) was statistically significant (mainly eutrophic) with catchments that included more than 10 % fields. We found iron-bound (Fe-P) increased increasing FA%, which agrees high expected losses cultivated areas. Additionally, populated areas pool Fe-P. Internal significantly positively related both Fe-P organic (Org-P). However, Org-P not (as third predictor) models had trophic state variable as first predictor second predictor. Further, profiles components indicated transformations long-term release, especially deeper maximum depth longer residence time. Finally, correlated quality variables including phytoplankton biomass, its proportion cyanobacteria, chlorophyll index. Our findings suggest reduction will decrease loads increase through reduced

Language: Английский

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Internal phosphorus loading in a chain of eutrophic hardwater lakes in Saskatchewan, Canada

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 924, P. 171493 - 171493

Published: March 7, 2024

Sediments can act as a source or sink of phosphorus (P) for the water column lakes. In iron (Fe)-rich softwater lakes, redox processes are important contributors to sediment P flux. However, contribution flux in hardwater with high pH and concentrations redox-insensitive calcium (Ca) is unknown. Intact cores, collected different seasons (summer fall) from chain eutrophic lakes southeastern Saskatchewan, Canada, were used quantify fluxes laboratory incubations under hypoxic oxic conditions at temperatures consistent season sample collection. Geochemical analyses determined total (TP) organic (TPo), matter (OM), Ca magnesium, extractable manganese, Fe aluminum. Sediment pools using sequential fractionation solution 31P nuclear magnetic resonance spectroscopy. significantly higher cores incubated (−24.4 28.5 mg m−2 d−1) than (−60.3 14.2 d−1). There significant seasonal lake differences TP, TPo cation concentrations, dominant all but one lake. Phosphate bound redox-sensitive pool was only fraction that differed among (0.10 0.18 g−1 d.w.; 9 16 % TP), an inverse relationship Principal component analysis suggests internally-generated forms OM surface sediments play key role internal loading these appears have overriding effect on P, partially masking impact control prairie

Language: Английский

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Risk and mechanisms of phosphorus release at the sediment–water interface of lakes in cold and arid regions during non-frozen seasons

Environmental Science and Pollution Research, Journal Year: 2024, Volume and Issue: 31(16), P. 23579 - 23590

Published: Feb. 29, 2024

Language: Английский

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Put the Land Back on the Land: A National Imperative

IntechOpen eBooks, Journal Year: 2024, Volume and Issue: unknown

Published: May 23, 2024

The Rivers and Harbors Act of 1899 (RHA1899), the Soil Conservation 1935 (SCA1935), Clean Water (CWA1972) were pivotal in managing United States (US) waters. RHA1899 provided Army Corps Engineers authority to regulate dredge fill operations. SCA1935 authorized US Department Agriculture combat soil erosion. CWA1972 empowered Environmental Protection Agency point-source pollution. implementation European Charter 1972 2000 Framework Directive Europe address similar erosion water quality problems. By 2022, improvements losses obtained with conservation programs, but continued organic topsoil threatened health, human welfare, ecosystems. Worldwide losses, estimated at 24 billion tonnes per year, include ~3 970 million respectively. Approximately 60% eroded materials are delivered rivers lakes threatening Dredged freshwater sediments, however, have beneficial uses including restoring health agricultural forestry lands resources. National initiatives involving defense, agriculture, environmental governmental units proposed for recycling organic, nutrient-rich aquatic sediments world-wide Put Land Back on programs.

Language: Английский

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Chemical Speciation and Preservation of Phosphorus in Sediments along the Southern Coast of Zhoushan Island

Water, Journal Year: 2024, Volume and Issue: 16(16), P. 2225 - 2225

Published: Aug. 6, 2024

This study investigated the distribution of sedimentary phosphorus (P) species along an area a rapid current at southern coast Zhoushan Island. The objective this was to improve understanding P cycling in zone water cycling. Results showed that average percentage each form total (TP) following order: apatite (Ca-P; 52%) found most abundant, followed by organic (OP; 16%), exchangeable-P (Ex-P; 14%), detrital (De-P; 11%), and iron-bound (Fe-P; 7%). Ca-P trend increasing concentration from location west (ZS1 has mean = 45.6 mg kg−1) toward east (ZS2 82.69 south-east (ZS3 82.17 kg−1); De-P also increased 15.12 kg−1 ZS1 22.53 ZS2 27.45 ZS3, but three bioavailable species, OP, Ex-P, Fe-P, decreased coastal area. cores occurrences sediment adsorption release throughout time span 1930s present, with overall decreasing TP bottom surface sediments. There tendency formation expense Ex-P OP during transport matter decomposition. likely impact climate change would be temperature resulting elevated decomposition release.

Language: Английский

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A landscape limnology approach to assessing controls on soluble reactive phosphorus in sediment porewater and internal loading risk

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 953, P. 176012 - 176012

Published: Sept. 3, 2024

Sediment nutrients can be mobilized to overlying water via internal loading, which important aquatic productivity. Using data from 143 Canadian lakes, we show high (~2400-fold) variation of soluble reactive phosphorus (SRP) concentrations in surficial sediment porewater, with results suggesting loading (IPL) is also likely vary widely. Consistent past work at smaller scales, that lake depth, pH, trophic status, and bulk Al:P Fe:P influence porewater SRP, IPL. Median SRP concentration lakes (molar ratios >10) were 4.8-fold than lower Al:P. In where sedimentary molar >10 was 3.9-fold Fe:P. High pH (>7.8), along hyper-eutrophic associated higher SRP. Finally, shallow (<4 m depth) had median 6-fold deep (>9 depth). Important regional differences emerged, linked soils, depth paralleling areas poor quality. For example, the Boreal Plains Prairies ecozones (dominated by Chernozems/Mollisols) 64-fold 44-fold Shield Podzols/Spodosols) (respectively), although note IPL risk across many ecozones. national data, found in-lake measurements (particularly salinity) showed strong capacity predicting (explaining 60-72 % variance data). Importantly, watershed predictors good predictive power, explaining ~50 using variables including soil types, agriculture. Porewater predicted reasonable accuracy easily measured variables, as estimates landscape limnology holds potential helping inform management informing understanding nutrient sources.

Language: Английский

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Climate Factors Increasing Importance for Internal P Dynamics in a Large Eutrophic Lake

Published: Jan. 1, 2024

Language: Английский

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