Theoretical model of the volumetric heat content of moist soil

Abstract

In the scientific literature, the thermal properties of soils are described by three indicators: heat absorption capacity, heat capacity, and heat conductivity. It is proposed to introduce into practice the prognostic equation of the volumetric heat content of moist soil, as its energy characteristic, by which it will be possible to judge not only the phase (ice, water, steam) state of the water in the soil, but also the nature of the soil-atmosphere heat exchange, that is important to know during seasonal thawing and characterizes the power of the process. Since the degree of saturation of the soil with water determines the thermal properties of the soil, the key point of this research is to prove the legitimacy of using the prognostic equation to calculate the moisture content of the soil. Calculations using the proposed equations are not difficult, since they are based on data from the available information of the state hydrometeorological services. The main advantage of prognostic equations is that they are not of statistical origin. Consequently, they are not related to a specific geographic point, which allows analyzing the parameter being studied by building the calculated indicators in one row and thus finding patterns in the soil-atmosphere system. Studies were conducted for three geographical points located on the same longitude, but at the same time located in different soil-climatic zones. Studies were conducted for conditions above 0 ° C inclusive. The research analyzes the results of the calculation of the predicted soil moisture content using two equations. A mathematical analysis of the equation was conducted, where the predicted value is the moisture content of the soil; a variable, the coefficient of moisture according to Ivanov. The legitimacy of using the index of the predicted soil moisture content in the model of the volumetric heat content of moist soil is theoretically proved.