R.Bezhenar, V.Maderich Model of heat exchange of water layer and bottom deposites on shallow water |
Applied hydromechanics, Vol. 10 (82) ¹ 3, (2008) |
| A numerical model for the water-bottom heat interaction was included into the three-dimensional model of hydrothermodynamics THREETOX. New model describes the distribution of temperature in sediments. In this model parametrization of heat fluxes through the bottom includes both forced and free convection mechanisms. A number of numerical experiments for different depth water bodies were carried out to analyze influence of bottom heat fluxes on diurnal regime of small lake. It was shown that temperature of near-bottom waters increases while temperature of near-surface waters decreases if we consider water-bottom heat interaction. This leads to increasing of turbulent flux from the atmosphere and decreasing backward due to long-wave radiation. The result of this is increasing of average temperature of the water body. Modeling calculations for idealized lakes shows that the influence of heat interaction with the bottom is essential in a scale of diurnal oscillations for water-bodies such as shallow lakes and lagoons. Besides we can observe smoothing of diurnal oscillations of water temperature for shallow lake due to heat fluxes from the bottom. |
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| TEXT LANGUAGE: Ukrainian |