Salugin A.N. ON THE QUESTION OF MATHEMATICAL MODELING OF THE EVAPORATION PROCESS // Arid Ecosystems. 2023. Vol. 29. № 2 (95). P. 12-19. | PDF
Mathematical methods for describing the processes of evaporation from the soil surface in the conditions of the southern Russia subarid zone are discussed. The analysis of theoretical works in this field and the results of their practical application are made. Mathematical modeling was used to explain the field observations. Mathematical models of evaporation from the soil surface are divided into two types: physico-mathematical models based on the interaction of water with the soil framework and phenomenological models based on balance ratios. The data on evaporation from the surfaces of light soils were analyzed taking into account the diffusion and film transfer of moisture in the pore space. In the analysis of cumulative evaporation from extended territories, a semi-empirical model was used, linking the intensity of evaporation with precipitation and the hydrophysical state of soil moisture aeration. The theory of capillary movement is in good agreement with the data on evaporation from the surface of open sandy soils. A nonlinear relationship between the evaporation rate and the thickness of the underlying surface and humidity has been revealed. The amount of annual precipitation in the south of Russia and cumulative evaporation are connected by power dependence, indicating the capillary-sorption nature of evaporation.
Keywords: evaporation, porosity, aeration zone, pressure gradient, humidity, capillary radius, mathematical modeling, water regime of soils.
Funding. The work was carried out for the state task No. 122020100450-9 “Development of a New Methodology for Optimal Management of Bio Resources in Agrolandscapes of the Arid Zone of the Russian Federation Using System-dynamic Modeling of Soil-hydrological Processes, a Comprehensive Assessment of the Impact of Climate Change and Anthropogenic Loads on Agrobiological Potential and Forest Conditions”.