Wind‐Induced Versus Plume‐Induced Inter‐Basin Exchange—Resolving Causal Influences in Plume‐Lake Modeling.
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| Titel: | Wind‐Induced Versus Plume‐Induced Inter‐Basin Exchange—Resolving Causal Influences in Plume‐Lake Modeling. |
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| Autoren: | Toledo, J. C., Rueda, F. J., Little, J. C., Ramón, C. L. |
| Quelle: | Water Resources Research; Aug2025, Vol. 61 Issue 8, p1-21, 21p |
| Schlagwörter: | PLUMES (Fluid dynamics), HYDRODYNAMICS, LAKES, HYPOXIA (Water), GAS flow, LAKE restoration |
| Abstract: | Bubble‐plumes are commonly used in lake restoration to alleviate problems associated with hypolimnetic hypoxia. In lakes with multiple basins separated by sills, bubble‐plumes have been used locally to boost oxygen levels in individual basins. However, they have the potential to affect inter‐basin exchange leading to unexpected results. Our goal is to assess the relative importance of natural versus plume forcing as drivers of exchange. This is critical to evaluate the field‐scale performance of bubble‐plume systems. We hypothesize that the contribution of bubble‐plumes as drivers of inter‐basin oxygen transport depends on the depths of detrainment and maximum plume rise relative to sill level (plume geometry). To test this hypothesis, 1D integral bubble‐plume models coupled to a 3D‐hydrodynamic model are applied to simulate the performance of an oxygenation system installed in 1990 in the north basin of Amisk Lake, Canada. Sources of uncertainty in bubble‐plume modeling, associated with model assumptions and parameter values (structural and parametric uncertainty), are systematically analyzed, and their effect on plume‐structure and inter‐basin exchange predictions are quantified. The effects of plume forcing on exchange rates and patterns are only significant as the equilibrium depth rises above the sill. For the prevailing conditions in the study case and the most widely accepted plume model, this occurs with low probability. More plausibly (for most parameter combinations), the plume injects oxygen below the sill, the oxygenated water being transported by internal waves between basins. Solid conclusions on the dominant drivers of large‐scale transport arise in attribution studies accounting for model uncertainty. Plain Language Summary: Bubble‐plumes, commonly used in lake restoration to avoid hypoxic conditions in eutrophic systems, are known to induce mixing in the hypolimnion, but they also have the potential to reshape larger‐scale circulation patterns. Amisk Lake, Canada, is used as a case example where an oxygenation system was deployed in 1990 in one of the two basins caused the injected oxygen to move through the shallow sill into the second basin. Two contrasting interpretations have been proposed regarding the effects of bubble‐plumes on exchange for that case, differing on the role given to the bubble plume as driver of interbasin exchange. Those interpretations lie in predictions from two different integral bubble‐plume models. Here we systematically analyze the effect that specific assumptions taken in the formulation of integral bubble‐plume models (structural uncertainty) and the particular choice of parameter values (parametric uncertainty) can have on the predicted behavior of the plume (level of plume rise, induced recirculation rate and the level at which the oxygenated water is injected). Coupled with a 3D lake hydrodynamic model we quantify the effect of the plume on exchange rates, depending on its behavior. Model configurations and parameters leading to significant changes in interbasin exchange are the least probable. Key Points: Integral plume models are heavily parameterized, and their results are strongly sensitive to the plume model assumptions and parametersThe role of bubble‐plumes in the interbasin transport is determined by the vertical structure relative to the sill, and vertical flowsThe interbasin transport of injected oxygen cannot be explained without a combination of meteorological and plume forcing [ABSTRACT FROM AUTHOR] |
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| Datenbank: | Biomedical Index |
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