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The work is devoted to the study of thermohydrodynamic characteristics of inland waters associated with turbulent mixing and relevant to the problems of meteorology, climatology and hydrology. To describe such characteristics, numerical models of different detailization are used, having their own features and advantages. We consider the one-dimensional LAKE model with parameterization of the horizontal pressure gradient well-suited for implementation in large-scale models and climate models. We additionally use the three-dimensional hydrostatic model for verification of 1D model ability to correctly reproduce mixing processes by simulating turbulence in inland waters of various horizontal sizes and under different initial conditions. The effects of internal wave oscillations on the mixing dynamics are analyzed. In addition, the authors implemented the parameterization of the turbulent Prandtl number into the 3D model.