Numerical analysis of influence of hill slope sheet flow on soil temperature

In order to further study the influence mechanism of the slope sheet flow on the thermal transport in soil, in this paper, based on slope water movement theory and thermodynamic equation, authors studied the temperature field distribution in soil quantitatively under the influence of slope sheet flow. The effects of rainfall intensity and surface transfer coefficient on temperature field distribution in soil were discussed, and the temperature variations in different depth of soil were analyzed. The results show that the influence of overland flow on the change of soil temperature is obvious. Heat transfer coefficient of hill slope sheet flow is influenced directly by temperature gradient between hill slope sheet flow and soil surface, then the variation of soil temperature is changed. There is a delay-effect of the change of deep soil temperature. The change of soil temperature within earlier rainfall course is mostly in soil surface, and the temperature distribution of deep soil is influenced with the lapse of pre-rain time. The work here will make on further understand of the study of mechanisms and motion models of water-heat exchange, and will be of great value of research on the consideration of problems related to hydrology, soil corrosion, water and soil conservation, agrology, agricultural irrigation, and so on.