Dynamics of vertical mixing in the hypolimnion of a deep lake: Lake Geneva

Michalski, Jerzy; Lemmin, Ulrich

doi:10.4319/lo.1995.40.4.0809

Cited by 30 publications

(32 citation statements)

References 8 publications

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“…In particular we shall look at those aspects which periodically, or contemporaneously, affect the quantity of heat present in the water mass, and consequently the internal hydrodynamics of a lake and, in short, its renewal time. Michalsky & Lemmin (1995), and after them other researchers, established that the thermocline does not constitute an insurmountable barrier to the downward flux of heat; on the contrary, below the thermocline there are considerable water movements (shears, internal waves, density currents, etc.) even at very deep levels, with an intensity varying from lake to lake.…”

Section: Heat Contentmentioning

confidence: 99%

Residence time and physical processes in lakes

Ambrosetti¹,

Barbanti²,

Sala³

2003

J Limnol

106

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The residence time of a lake is highly dependent on internal physical processes in the water mass conditioning its hydrodynamics; early attempts to evaluate this physical parameter emphasize the complexity of the problem, which depends on very different natural phenomena with widespread synergies. The aim of this study is to analyse the agents involved in these processes and arrive at a more realistic definition of water residence time which takes account of these agents, and how they influence internal hydrodynamics. With particular reference to temperate lakes, the following characteristics are analysed: 1) the set of the lake's caloric components which, along with summer heating, determine the stabilizing effect of the surface layers, and the consequent thermal stratification, as well as the winter destabilizing effect; 2) the wind force, which transfers part of its momentum to the water mass, generating a complex of movements (turbulence, waves, currents) with the production of active kinetic energy; 3) the water flowing into the lake from the tributaries, and flowing out through the outflow, from the standpoint of hydrology and of the kinetic effect generated by the introduction of these water masses into the lake. These factors were studied in the context of the general geographical properties of the lake basin and the watershed (latitude, longitude, morphology), also taking account of the local and regional climatic situation. Also analysed is the impact of ongoing climatic change on the renewal of the lake water, which is currently changing the equilibrium between lake and atmosphere, river and lake, and relationships

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Section: Heat Contentmentioning

confidence: 99%

Residence time and physical processes in lakes

Ambrosetti¹,

Barbanti²,

Sala³

2003

J Limnol

106

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show abstract

“…6f) likely corresponded to the seasonal difference of heat content in a small, shallow template water-body (Rodríguez-Rodríguez and Moreno-Ostos, 2006). The impact of typhoon-induced inflow was large although the inflow effect is usually minor in physical processes in large lakes (Michalsky and Lemmin, 1995). For understanding localized mixing for stratified water bodies, numerous spot measurements are necessary to reveal more precise characteristics of inflow-induced vertical mixing in specific areas with density plume phenomena (Laborde et al, 2010;Hogg et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Contribution of extreme meteorological forcing to vertical mixing in a small, shallow subtropical lake

et al. 2016

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“…The lake is heavily affected by wind-induced currents, mixing and internal waves (Bouffard and Lemmin, 2013). Concurrently, its size makes it thermally stable, and the mild climate maintains a relatively high hypolimnion temperature (above 5 • C) (Michalski and Lemmin, 1995). Full mixing occurs irregularly in Lake Geneva (every 7 years on average).…”

Section: Sites Presentation and In Situ Datamentioning

confidence: 99%

Optimizing the parameterization of deep mixing and internal seiches in one-dimensional hydrodynamic models: a case study with Simstrat v1.3

et al. 2017

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Abstract. This paper presents an improvement of a onedimensional lake hydrodynamic model (Simstrat) to characterize the vertical thermal structure of deep lakes. Using physically based arguments, we refine the transfer of wind energy to basin-scale internal waves (BSIWs). We consider the properties of the basin, the characteristics of the wind time series and the stability of the water column to filter and thereby optimize the magnitude of wind energy transferred to BSIWs. We show that this filtering procedure can significantly improve the accuracy of modelled temperatures, especially in the deep water of lakes such as Lake Geneva, for which the root mean square error between observed and simulated temperatures was reduced by up to 40 %. The modification, tested on four different lakes, increases model accuracy and contributes to a significantly better reproduction of seasonal deep convective mixing, a fundamental parameter for biogeochemical processes such as oxygen depletion. It also improves modelling over long time series for the purpose of climate change studies.

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Dynamics of vertical mixing in the hypolimnion of a deep lake: Lake Geneva

Cited by 30 publications

References 8 publications

Residence time and physical processes in lakes

Residence time and physical processes in lakes

Contribution of extreme meteorological forcing to vertical mixing in a small, shallow subtropical lake

Optimizing the parameterization of deep mixing and internal seiches in one-dimensional hydrodynamic models: a case study with Simstrat v1.3

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