Inflow Dynamics in Weakly Stratified Lakes Subject to Large Isopycnal Displacements

Ramón, Cintia L.; Priet-Mahéo, Morgane; Rueda, Francisco J.; Andradóttir, Hrund Ólöf

doi:10.1029/2019wr026578

Cited by 7 publications

(7 citation statements)

References 57 publications

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“…As the inflows become larger,

U_{u}

increases and the conditions for internal wave and plume interaction differ more from the regimes reported in the literature (Cortés et al 2014; Hogg et al 2018; Ramón et al 2020). During the wet season, flood plumes have maximum velocities close to 0.2 m s −1 , much larger than those of the basin‐scale internal waves, so the inflow currents dominate and affect the dynamics of basin‐scale internal waves.…”

Section: Discussionmentioning

confidence: 73%

“…Also, because

U_{u} ≫ U_{i - \max}

, reduction in mass influx and thickness of the plume by the internal wave currents (Hogg et al 2018) is not likely to occur in Porce II dry season. Although the weak stratification of Porce II makes it likely for the internal wave timing to influence the river intrusion depth as in Ramón et al (2020), the internal wave amplitude of Porce II is only about 3 m, and the stratification is roughly continuous instead of two‐layered, so we suggest that the timing of the internal wave displacements should not influence appreciably the initial fate of the plume in Porce II, at least not with the dramatic effect observed by Ramón et al (2020).…”

Section: Discussionmentioning

confidence: 97%

“…The internal wave field can interact with the riverine plume and affect its final intrusion depth (Cortés et al 2014; Ramón et al 2020), mass transport, and thickness (Hogg et al 2018), depending primarily on the relative speed of the plume (

U_{u}

) and of isotherms moving along the bottom near the river entrance (

U_{i}

), and the phase of the internal wave displacements (upwelling‐downwelling) near the inlet at the time of the inflow. Because of the inflow seasonality, conditions for its interaction with the internal wave field change along the year.…”

Section: Discussionmentioning

confidence: 99%

“…Basin‐scale internal‐wave oscillations can interact with river density currents, affecting the evolution of both processes. The bulk of research on the interactions between these processes are focused on regimes where the internal waves are dominant and have a large influence on the pathway (Cortés et al 2014; Ramón et al 2020) and mass transport and thickness (Hogg et al 2018) of the plume. In contrast, less is known about the effect of density currents on internal waves, particularly when the plume is faster than internal wave currents, as river floods in canyon reservoirs that might be frequent (Ma et al 2015; Xie et al 2017), but are rarely reported in the literature.…”

mentioning

confidence: 99%

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Effects of riverine inflows on the climatology of a tropical Andean reservoir

Posada-Bedoya

Gómez-Giraldo

Román-Botero

2021

Limnology & Oceanography

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Field data and numerical modeling were used to investigate the effects of the riverine inflows on the seasonality of the lake mean temperature, thermal structure, and basin‐scale internal waves in a tropical Andean reservoir. Lake temperature and external forcing were measured during contrasting hydrological periods modulated by severe cold (2011–2012) and warm (2015–2016) phases of El Niño–Southern Oscillation (ENSO), a major driver of Andes hydrology. The seasonal heat budget of the reservoir was driven by the competing rates of cooling by the inflow and heating through the surface. As the atmospheric heating rate remained roughly constant, the seasonality of the river inflow heat flux drove the seasonal reservoir temperature. The inflow also intervened on the heat transport within the reservoir and, during dry periods, mixed heat downward from the surface layer and introduced heat at intermediate depths such that a thick metalimnion formed that brought the V2H1 mode into resonance with the diurnal wind forcing. During wet periods, the inflow compressed and cooled the metalimnion, tuning the V1H1 mode to resonate with the diurnal wind. It was also observed that large inflows destroyed temporarily coherent basin‐scale internal wave motions. Because of the dominant role of the inflow on the seasonal reservoir temperature, changes within the reservoir will be more strongly related to changing temperature and volume of the incoming water than atmospheric forcing as in many large natural lakes.

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“…As the inflows become larger,

U_{u}

Section: Discussionmentioning

confidence: 73%

“…Also, because

U_{u} ≫ U_{i - \max}

Section: Discussionmentioning

confidence: 97%

U_{u}

) and of isotherms moving along the bottom near the river entrance (

U_{i}

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Effects of riverine inflows on the climatology of a tropical Andean reservoir

Posada-Bedoya

Gómez-Giraldo

Román-Botero

2021

Limnology & Oceanography

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“…Future studies on the dynamics of weakly stratified water bodies will be relevant to assess deepwater ventilation in wintertime mid-latitude lakes and summertime high-latitude lakes (Priet-Mahéo et al, 2019;Ramón et al, 2020).…”

Section: Basin-scale Modes Of Motionmentioning

confidence: 99%

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

Abarca¹,

Ulloa²,

Niño³

2022

Preprint

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

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Modeling the Effects of River Inflow Dynamics on the Deep Layers of Lake Biwa, Japan

Koue

2023

Environ. Process.

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Climate change-induced extreme weather events, including prolonged droughts and intense rainfall, exert a significant influence on river inflows. These inflows act as vital conduits for nutrient transport, water quality modulation, and the regulation of thermal dynamics in lakes and oceans. In this context, this study conducts a comprehensive examination of the multifaceted effects stemming from river water characteristics, snowmelt water influence, and shifts in precipitation patterns on the stratification dynamics of Lake Biwa in Japan. To facilitate these investigations, a hydrodynamic model was developed to simulate thermal stratification in Lake Biwa. The results demonstrate that an increase in precipitation and river water flow, specifically doubling these factors, leads to noticeable cooling of the lake’s surface layer and a consequent destabilization of stratification during the stratification period. Conversely, halving these factors stabilizes stratification. Furthermore, elevating river water temperature by 5 °C raises water temperature near the upper thermocline, encouraging vertical mixing within the surface layer. Conversely, a 5 °C decrease induces significant temperature fluctuations and an unstable stratification extending from the surface to deeper layers. Notably, the spatial variance in water temperature within Lake Biwa is profoundly influenced by fluctuations in river water temperature. This study underscores the critical importance of considering river plumes in the study of material circulation, stratification dynamics, and ecological well-being in lakes and oceans. Given the mounting concerns related to eutrophication and the prevalence of anoxia in aquatic ecosystems, this research provides invaluable insights into assessing the impacts of river plumes on Lake Biwa’s stratification structure and seasonal dynamics.

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Inflow Dynamics in Weakly Stratified Lakes Subject to Large Isopycnal Displacements

Cited by 7 publications

References 57 publications

Effects of riverine inflows on the climatology of a tropical Andean reservoir

Effects of riverine inflows on the climatology of a tropical Andean reservoir

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

Modeling the Effects of River Inflow Dynamics on the Deep Layers of Lake Biwa, Japan

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