坡面薄层水流对土壤温度影响的数值分析

为深入研究坡面薄层水流对土壤内热量运移的影响机理，该文基于坡面薄层水流运动理论及热力学方程，定量研究坡面薄层水流影响下的土壤温度场分布，分析降雨强度、表面换热系数对土壤温度分布的影响机理，以及不同深度土壤温度的变化规律。分析结果表明，降雨过程中坡面水流对土壤温度变化影响明显，且随时间推移而发生变化；坡面薄层水流与土壤表面之间温度梯度直接影响到坡面薄层水流换热系数的大小，从而改变土壤温度的变化规律；深部土壤温度变化具有滞后效应，降雨前期土壤温度变化主要集中在土壤表面，随降雨时间的推移，进而影响到深层土壤的温度分布。该研究为土壤中水热交换机制和运动模型的进一步的研究提供参考，对水文学、土壤侵蚀和水土保持、土壤学、农业灌溉等相关问题的研究有着一定参考价值

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.