Peculiarities of the Vertical Thermal Regime of Lake Tapeliai
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Laboratory of Photovoltaic Technology VGTU, Vilnius, Lithuania
Department of Physics, Faculty of Fundamental Sciences, Vilnius Gediminas Technical University, Vilnius, Lithuania
Submission date: 2018-04-16
Final revision date: 2018-07-19
Acceptance date: 2018-08-02
Online publication date: 2019-03-25
Publication date: 2019-04-09
Corresponding author
Paulius Miškinis   

Vilnius Gediminas Technical University, Saulėtekio Ave 11, LT-10223 Vilnius, Lithuania
Pol. J. Environ. Stud. 2019;28(4):2765-2772
A nonlinear model of temperature dependence on lake depth is proposed for interpreting the vertical thermal structure of a lake. The model has two critical temperatures: T1* – the maximum density water temperature Tcr = 4ºC and T2* – the lake water surface asymptotic temperature in warm seasons. Although the model depends on four parameters, its solution and properties are effectively determined by only two dimensionless parameters: the constant temperature gradient γ and the nonlinearity parameter v. The proposed thermodepth model is applicable to the interpretation of the vertical thermal regime of Lake Tapeliai by comparing the results of theoretical calculations and experimental measurements. Within the limits of our model, the position of the thermocline can be determined theoretically, i.e., the model parameters allow for expressing the thermocline position. A great match has been obtained between experimental data and theoretical dependencies.
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