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Modeling the Evaporation Process

  • SYSTEMATIC STUDY OF ARID TERRITORIES
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Abstract

Mathematical methods for description of the processes of evaporation from the soil surface under conditions of the sub-arid zone of the south of Russia are discussed. Theoretical studies in this area and the results of their practical application have been analyzed. Natural observations are explained using mathematical modeling. Mathematical models of evaporation from the soil surface are divided into two types: physico-mathematical, which are based on the interaction between the water and the soil carcass, and phenomenological, which are based on balance ratios. The data on the evaporation from the surfaces of light soils have been analyzed with allowance for the diffusive and film transfer of moisture within the pore space. The cumulative evaporation from extended areas has been analyzed using a semi-empirical model, which connected evaporation intensity with the precipitation and the hydrophysical state of the soil moisture in the aeration zone. Good agreement between the theory of the capillary transfer of moisture and the data on the evaporation from the surface of open sandy soils has been revealed. A nonlinear relationship between the evaporation rate and the depth of the underlying surface, as well as the capillary-sorption pressure, has been revealed. The amount of annual precipitation in the south of Russia and the cumulative evaporation are associated with each other via a power dependence indicating the capillary-sorption nature of the evaporation.

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Notes

  1. WP, wilting point; FMC, field moisture capacity.

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Funding

The study was performed within the framework of the State Assignment no. 122020100450-9 “Development of a new methodology for the optimal management of bioresources in the agrolandscapes of the arid zone of Russian Federation using a system and dynamical modeling of soil and hydrogeological processes and a complex evaluation of the effect of climatic changes and anthropogenic loads on the agrobiological potential and forest conditions.”

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Correspondence to A. N. Salugin.

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Translated by N. Statsyuk

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Salugin, A.N. Modeling the Evaporation Process. Arid Ecosyst 13, 133–139 (2023). https://doi.org/10.1134/S2079096123020129

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  • DOI: https://doi.org/10.1134/S2079096123020129

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