Abstract
Temperature is an integral part of soil quality in terms of moisture content; coupling between water and heat can render a soil fertile, and plays a role in water conservation. Although it is widely recognized that both water and heat transport are fundamental factors in the quantification of soil mass and energy balance, their computation is still limited in most models or practical applications in the root zone under non-isothermal conditions. This research was conducted to: (a) implement a fully coupled mathematical model that contains the full coupled process of soil water and heat transport with plants focused on the influence of temperature gradient on soil water redistribution and on the influence of change in soil water movement on soil heat flux transport; (b) verify the mathematical model with detailed field monitoring data; and (c) analyze the accuracy of the model. Results show the high accuracy of the model in predicting the actual changes in soil water content and temperature as a function of time and soil depth. Moreover, the model can accurately reflect changes in soil moisture and heat transfer in different periods. With only a few empirical parameters, the proposed model will serve as guide in the field of surface irrigation.
Highlights
Soil temperature is not stable in the field, especially in northern semi–arid areas where drastic changes in season and temperature occur [1,2]
The soil water content and temperature in the column of soil soil were measured during surface irrigation
The experimental data were used to evaluate the were measured during surface irrigation
Summary
Soil temperature is not stable in the field, especially in northern semi–arid areas where drastic changes in season and temperature occur [1,2]. The presence of a soil temperature gradient affects the transfer of soil water by affecting the physical properties of soil water, and affects the redistribution of soil water [5,6]. The thermodynamic characteristics of soil are altered, affecting heat flow in soil [7]. This phenomenon shows that a coupling relationship exists between water and heat transfer in soil [8]. In studying soil water movement, the effect of temperature gradient on soil water movement parameters and of heat flux on soil water movement cannot be ignored [9]
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