Vertical distribution of picocyanobacteria in deep lakes: the influence of inorganic turbidity DOI Creative Commons
Luca Schenone, Beatriz Modenutti, Esteban Balseiro

et al.

Research Square (Research Square), Journal Year: 2023, Volume and Issue: unknown

Published: Dec. 21, 2023

Abstract Picocyanobacteria (Pcy) represent the dominant photosynthetic fraction in aquatic systems, contributing significantly to global primary production and playing a key role biogeochemical cycles. Based on 20-years dataset of situ observations four deep Andean North-Patagonian lakes, we analyzed presented simple model understand how input inorganic particles affects light penetration influences vertical distribution freshwater Pcy during summer stratification. The temporal series includes two important events (volcanic eruption glacial recession) that substantially affected lake turbidity. Thus, our mechanistic was constructed as function changes extinction coefficient (Kd PAR ) mean irradiance mixing layer (I m ). Our modeling approach using Bayesian inference continuous non-monotonic successfully predicted distribution. obtained successful fitting data different minerogenic ashes clay) predicting under sharp increases turbidity eruptions) well more steady (glacial recession). maximum abundance increased with transparency (lower Kd values) amplitude profile higher I values. Using model, achieved full prediction scenarios thermal structures.

Language: Английский

Heavy Metals in Bottom Sediments of Qarun Lake, Faiyum, Egypt: Spatial Distribution, Sources and Ecological Risk Assessment DOI
Mohammed H. Aljahdali, Ramadan M. El-Kahawy, Ibrahim M. Ghandour

et al.

Earth Systems and Environment, Journal Year: 2025, Volume and Issue: unknown

Published: May 8, 2025

Language: Английский

Citations

0
Road salt-induced salinization impacts water geochemistry and mixing regime of a Canadian urban lake DOI Creative Commons
Jovana Radosavljevic, Stephanie Slowinski, Fereidoun Rezanezhad

et al.

Applied Geochemistry, Journal Year: 2024, Volume and Issue: 162, P. 105928 - 105928

Published: Feb. 1, 2024

The extensive use of road salts as deicers during winter months is causing the salinization freshwater systems in cold climate regions worldwide. We analyzed 20 years (2001–2020) data on lake water chemistry, land cover changes, and salt applications for Lake Wilcox (LW) located southern Ontario, Canada. situated within a rapidly urbanizing watershed which, period observation, average 785 tons were applied annually. However, only about quarter this has reached so far. That is, most been retained watershed, likely through accumulation soils groundwater. Despite high retention, time series trend analyses LW show significant increases dissolved concentrations sodium (Na+) chloride (Cl−), well those sulfate (SO42−), calcium (Ca2+), magnesium (Mg2+). relative changes major ion indicate shift chemistry from mixed SO42–Cl–Ca2+-Mg2+ type to Na + -Cl- type. Salinization further strengthening lengthening lake's summer stratification, turn, enhancing hypoxia hypolimnion increasing internal loading limiting nutrient phosphorus. theoretical salinity threshold at which fall overturn would become increasingly unlikely was estimated around 1.23 g kg−1. A simple mass balance model predicts that, under current impermeable expansion, could reach by mid-century. Our results also highlight need additional research accruing legacies watersheds because they represent potential long-term threats quality receiving ecosystems regional groundwater resources.

Language: Английский

Citations

2
Estimation Method of Chlorophyll Concentration Distribution Based on UAV Aerial Images considering Turbid Water Distribution in a Reservoir DOI Open Access
Mitsuteru Irie,

Yugen Manabe,

Masafumi Yamashita

et al.

Published: April 5, 2024

The causes of algal blooms in reservoirs are often complexly intertwined with chemical, physical, and biological factors such as the supply nutrients. Observation phytoplankton distribution high spatiotemporal resolution is necessary to track nutrient sources that cause understand their behavior response wind water temperature stratification. from a UAV, which has excellent temporal spatial resolution, considered be an effective method obtain quality information comprehensively. On other hand, it not only growth plankton affects color surface but also turbidity. Furthermore, since brightness value passive sensors optical cameras changes depending on amount insolation, perform analysis after making corrections for this. In this study, we attempted develop estimating chlorophyll concentration aerial images taken UAVs using machine learning takes into account correction based insolation turbidity evaluated by satellite image analysis.

Language: Английский

Citations

2
Vertical distribution of picocyanobacteria in deep lakes: the influence of inorganic turbidity DOI
Luca Schenone, Beatriz Modenutti, Esteban Balseiro

et al.

Aquatic Sciences, Journal Year: 2024, Volume and Issue: 86(2)

Published: March 5, 2024

Language: Английский

Citations

0
INVESTIGATION OF THE EFFECT OF SPACE VARYING WIND INPUT ON HYDRODYNAMIC MODELING IN MANILA BAY AND LAGUNA LAKE DOI Creative Commons

M. R. Dangin,

L. A. Sumagaysay,

Eugene C. Herrera

et al.

˜The œinternational archives of the photogrammetry, remote sensing and spatial information sciences/International archives of the photogrammetry, remote sensing and spatial information sciences, Journal Year: 2024, Volume and Issue: XLVIII-4/W8-2023, P. 143 - 148

Published: April 24, 2024

Abstract. Surface water currents and waves are largely driven by wind forcing inducing shear stress to the surface. The circulations formed carry with it various materials pollutants all over a large body of like Manila Bay Laguna Lake. Considering spatial temporal variability Lake is essential model hydrodynamics more accurately. This study simulated bay using high resolution space- time-varying data from Weather Research Forecasting (WRF) as input compared results uniform-directed wind. downscaled winds WRF demonstrated patterns in agreement country’s seasonal monsoon dynamics. Its effect on pronounced during dry season changes flow direction at mouth. On other hand, hydrodynamic difference circulation for lake was accentuated defined clockwise gyre wet where prevailing stronger. Thus, imperative incorporate spatially varying accurately characterize movement. Results also showed that global weather inputs can be used areas scarce monitoring stations long they validated.

Language: Английский

Citations

0
Estimation Method of Chlorophyll Concentration Distribution Based on UAV Aerial Images Considering Turbid Water Distribution in a Reservoir DOI Creative Commons
Mitsuteru Irie,

Yugen Manabe,

Masafumi Yamashita

et al.

Drones, Journal Year: 2024, Volume and Issue: 8(6), P. 224 - 224

Published: May 29, 2024

The observation of the phytoplankton distribution with a high spatiotemporal resolution is necessary to track nutrient sources that cause algal blooms and understand their behavior in response hydraulic phenomena. Photography from UAVs, which has an excellent temporal spatial resolution, effective method obtain water quality information comprehensively. In this study, we attempted develop for estimating chlorophyll concentration aerial images using machine learning considers brightness correction based on insolation turbidity evaluated by satellite image analysis. reflectance harmful algae bloom (HAB) was different seen under normal conditions; so, containing HAB were causes error estimation concentration. First, when occurred extracted discrimination learning. Then, other used regression Finally, coefficient determination between estimated no analysis observed value reached 0.84. proposed enables detailed depiction concentration, contributes improvement management reservoirs.

Language: Английский

Citations

0
Urban Water-Related Problems DOI Open Access

Akira Kawamura,

Kei Nakagawa

Water, Journal Year: 2023, Volume and Issue: 15(18), P. 3280 - 3280

Published: Sept. 16, 2023

Urban areas are considered to be the most vulnerable water-related problems, which involve a lack or excess of water problems from perspectives quantity and quality [...]

Language: Английский

Citations

0
Vertical distribution of picocyanobacteria in deep lakes: the influence of inorganic turbidity DOI Creative Commons
Luca Schenone, Beatriz Modenutti, Esteban Balseiro

et al.

Research Square (Research Square), Journal Year: 2023, Volume and Issue: unknown

Published: Dec. 21, 2023

Abstract Picocyanobacteria (Pcy) represent the dominant photosynthetic fraction in aquatic systems, contributing significantly to global primary production and playing a key role biogeochemical cycles. Based on 20-years dataset of situ observations four deep Andean North-Patagonian lakes, we analyzed presented simple model understand how input inorganic particles affects light penetration influences vertical distribution freshwater Pcy during summer stratification. The temporal series includes two important events (volcanic eruption glacial recession) that substantially affected lake turbidity. Thus, our mechanistic was constructed as function changes extinction coefficient (Kd PAR ) mean irradiance mixing layer (I m ). Our modeling approach using Bayesian inference continuous non-monotonic successfully predicted distribution. obtained successful fitting data different minerogenic ashes clay) predicting under sharp increases turbidity eruptions) well more steady (glacial recession). maximum abundance increased with transparency (lower Kd values) amplitude profile higher I values. Using model, achieved full prediction scenarios thermal structures.

Language: Английский

Citations

0