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研究非饱和土壤水分的运动方向,传统理论是以达西定律为基础的,结论是在不同条件中水分运动的方向取决于相应的水势梯度。本文根据热力学理论,应用吉布斯自由能函数,推得在定温定压下非饱和土壤中水分运动方向的热力学判别式,并根据吉布斯自由能判据,判别在不同条件下土壤水分运动的方向,所得结果与在一定条件下所观察到的非饱和土壤水分的运动方向一致。
Studying the movement direction of unsaturated soil moisture, the traditional theory is based on Darcy’s law. The conclusion is that the direction of water movement depends on the corresponding water potential gradient under different conditions. Based on the theory of thermodynamics, Gibbs free energy function is used to deduce the thermodynamic discriminant of water movement in unsaturated soil under constant temperature and pressure. According to the Gibbs free energy criterion, soil water movement under different conditions The results obtained are consistent with the observed movement of unsaturated soil moisture under certain conditions.