Basin-scale hydrodynamics and physical connectivity in a Great Patagonian Lake DOI Creative Commons

Javiera Abarca,

Hugo N. Ulloa, Yarko Niño

et al.

EarthArXiv (California Digital Library), Journal Year: 2022, Volume and Issue: unknown

Published: Dec. 6, 2022

Patagonian lakes are one of the most unexplored aquatic environments on Earth, and little is known about their thermo-hydrodynamics current trophic state. Meanwhile, increasing urbanization industrialization in catchments compromise health. Here, we investigate Lake Llanquihue, Earth's great freshwater bodies Northern Patagonia, Chile. Still considered a pristine environment, Llanquihue has experienced recent contamination events along its littoral, whose impacts remain unknown. In response, public private agencies have started to develop tailor-made monitoring plans survey water quality. However, without comprehensive knowledge lake's functioning, it impossible determine fate effects contaminants body. characterize via numerical simulations basin-scale hydrodynamics crucial information for diagnosing transport dissolved suspended matter within basin. Aiming delimit regions impacted by contaminated discharges, pose fundamental question that applies any lake: What physical connectivity between two zones interest lake? To address this question, introduce framework characterizes preferential pathways quantifies timescale tracers take stream from zone another an system. This applied among main urban rural settlements connected littoral Llanquihue. Our results show long-distance primarily controlled time-persistent, large-scale gyre seasonal mesoscale gyres. The above will enable lake managers monitor health basin, identify notify potential risk polluted effluents, advance toward more sustainable relationship with

Language: Английский

Lake Water Temperature Modeling in an Era of Climate Change: Data Sources, Models, and Future Prospects DOI Creative Commons
Sebastiano Piccolroaz, Senlin Zhu, Robert Ladwig

et al.

Reviews of Geophysics, Journal Year: 2024, Volume and Issue: 62(1)

Published: Feb. 11, 2024

Abstract Lake thermal dynamics have been considerably impacted by climate change, with potential adverse effects on aquatic ecosystems. To better understand the impacts of future change lake and related processes, use mathematical models is essential. In this study, we provide a comprehensive review water temperature modeling. We begin discussing physical concepts that regulate in lakes, which serve as primer for description process‐based models. then an overview different sources observational data, including situ monitoring satellite Earth observations, used field classify various available, discuss model performance, commonly performance metrics optimization methods. Finally, analyze emerging modeling approaches, forecasting, digital twins, combining deep learning, evaluating structural differences through ensemble modeling, adapted management, coupling This aimed at diverse group professionals working fields limnology hydrology, ecologists, biologists, physicists, engineers, remote sensing researchers from private public sectors who are interested understanding its applications.

Language: Английский

Citations

48
Turbulence Characteristics of Ice‐Free Radiatively Driven Convection in a Deep, Unstratified Lake DOI Creative Commons
Kenneth Larrieu, Oscar Sepúlveda Steiner, Drew M. Friedrichs

et al.

Geophysical Research Letters, Journal Year: 2025, Volume and Issue: 52(7)

Published: April 1, 2025

Abstract This study examines data collected with an autonomous underwater glider during a period of vigorous radiatively driven convection (RDC) and low winds in deep, unstratified Lake Superior. Conductivity, temperature depth (CTD) measurements reveal distinct convective plumes warm downwelling water anomalies C width scales on the order m, consistent theoretical scalings for regime. Shear microstructure indicate turbulent kinetic energy (TKE) dissipation variance rates orders magnitude greater thermal than laterally adjacent waters. Decay timescales highly efficient mixing is sustained throughout night. Energetics, efficiency, constraints plume are also discussed. These observations demonstrate that RDC can dominate vertical dynamics even deep ice‐free systems, these systems serve as real‐scale laboratory investigation dynamics.

Language: Английский

Citations

0
Asymmetric Kelvin-Helmholtz instabilities in stratified shear flows DOI
Adam J. K. Yang, Mary‐Louise Timmermans, Gregory A. Lawrence

et al.

Physical Review Fluids, Journal Year: 2024, Volume and Issue: 9(1)

Published: Jan. 2, 2024

This study elucidates the regime of fluid instabilities that can arise in a stratified shear flow when density and velocity interfaces are not aligned - common occurrence various geophysical flows. Through combination linear stability analysis direct numerical simulations, we unveil hybrid mode characterized by features both Kelvin-Helmholtz Holmboe instabilities. By quantifying crucial role asymmetry, our findings contribute to refined understanding dynamics mixing these

Language: Английский

Citations

3
Sedimentation in particle-laden flows with and without velocity shear DOI Open Access
Adam J. K. Yang, Jason Olsthoorn, Mary‐Louise Timmermans

et al.

Physics of Fluids, Journal Year: 2023, Volume and Issue: 35(8)

Published: Aug. 1, 2023

The vertical transport of sediment from particle-laden flows in marine settings can be enhanced by a settling-driven convective instability. presence horizontal velocity shear further influence this transport. We conduct numerical simulations to investigate the and absence shear. show how is determined competition between growth instability (Rayleigh–Taylor) stratified (Kelvin–Helmholtz). In shear, Rayleigh–Taylor drives transport; effect increases with Stokes settling particles decreases stratification strength. there are two regimes effective settling. When Kelvin–Helmholtz grows rapidly suppresses instability, significantly reduced. On other hand, if dominates completely inhibits due additional energy input explore parameter space these interpret their physics.

Language: Английский

Citations

4
Floating active carpets drive transport and aggregation in aquatic ecosystems DOI
Gabriel Aguayo, Arnold J. T. M. Mathijssen, Hugo N. Ulloa

et al.

Journal of Fluid Mechanics, Journal Year: 2024, Volume and Issue: 995

Published: Sept. 23, 2024

Communities of swimming microorganisms often thrive near liquid–air interfaces. We study how such ‘active carpets’ shape their aquatic environment by driving biogenic transport in the water column beneath them. The hydrodynamic stirring that active carpets generate leads to diffusive upward fluxes nutrients from deeper layers, and downward oxygen carbon. Combining analytical theory simulations, we examine studying fundamental metrics, including single pair diffusivity, first passage time for particle encounters rate aggregation. Our findings reveal fluctuations driven have a region influence reaches orders magnitude further distance than size organisms. These non-equilibrium lead strongly enhanced diffusion particles, which is anisotropic space dependent. Fluctuations also facilitate pairs, quantify analysing velocity correlation functions as function between particles. found particles plays crucial role encounter rates, with larger situated carpet being more favourable Overall, this research broadens our comprehension systems out equilibrium biologically contribute elements biogeochemical cycles.

Language: Английский

Citations

1
Turbulent mixing layers and associated diffusive fluxes across the epilimnion and metalimnion in stratified large Lake Biwa DOI Creative Commons
Hikaru Homma, Eiji Masunaga, Ilia Ostrovsky

et al.

Limnology and Oceanography, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 28, 2024

Abstract Stratification and turbulent mixing have an immense impact on biogeochemical regimes ecosystem dynamics in stratified large lakes. This study investigates the physical properties of epi‐ metalimnion Lake Biwa (Japan), focusing persistent vertical diffusive fluxes due to lower their effects upward nitrate transport. We conducted 24‐h observations at offshore station summer for three consecutive years examine temporal variations stratification turbulence. A mooring system provided long‐term data current velocity, while thermal profiles along two transects were collected investigate lateral changes. Our findings revealed strong upper metalimnion, where essentially suppressed. Distinct layers identified near water surface within moderately metalimnion. Field numerical model suggested that turbulence was driven by shear instability, straining, and/or wave–wave interactions linked with internal waves occur even during weak winds. Vertical eddy diffusivity > 10 −5 m 2 s −1 associated rather turbulence, which has not been reported other The elevated resulted flux 0.2 mmol N −2 d across indicating nutrient transport could support primary productivity play important ecological role deep

Language: Английский

Citations

0
Basin-scale hydrodynamics and physical connectivity in a great Patagonian Lake DOI

Javiera Abarca,

Hugo N. Ulloa, Yarko Niño

et al.

Journal of Great Lakes Research, Journal Year: 2022, Volume and Issue: 49(1), P. 172 - 189

Published: Dec. 23, 2022

Language: Английский

Citations

1
Basin-scale hydrodynamics and physical connectivity in a Great Patagonian Lake DOI Creative Commons

Javiera Abarca,

Hugo N. Ulloa, Yarko Niño

et al.

EarthArXiv (California Digital Library), Journal Year: 2022, Volume and Issue: unknown

Published: Dec. 6, 2022

Patagonian lakes are one of the most unexplored aquatic environments on Earth, and little is known about their thermo-hydrodynamics current trophic state. Meanwhile, increasing urbanization industrialization in catchments compromise health. Here, we investigate Lake Llanquihue, Earth's great freshwater bodies Northern Patagonia, Chile. Still considered a pristine environment, Llanquihue has experienced recent contamination events along its littoral, whose impacts remain unknown. In response, public private agencies have started to develop tailor-made monitoring plans survey water quality. However, without comprehensive knowledge lake's functioning, it impossible determine fate effects contaminants body. characterize via numerical simulations basin-scale hydrodynamics crucial information for diagnosing transport dissolved suspended matter within basin. Aiming delimit regions impacted by contaminated discharges, pose fundamental question that applies any lake: What physical connectivity between two zones interest lake? To address this question, introduce framework characterizes preferential pathways quantifies timescale tracers take stream from zone another an system. This applied among main urban rural settlements connected littoral Llanquihue. Our results show long-distance primarily controlled time-persistent, large-scale gyre seasonal mesoscale gyres. The above will enable lake managers monitor health basin, identify notify potential risk polluted effluents, advance toward more sustainable relationship with

Language: Английский

Citations

0