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 引用本文: 姚德良, 李家春, 沈卫明. 植物固沙区土壤水热运移耦合模型研究[J]. 力学学报, 1996, 28(5): 513-521.
Jiachun Li, . A COUPLING MODEL OF WATER-HEAT MOVEMENT IN THE SOIL OF SAND-FIXATION AREA[J]. Chinese Journal of Theoretical and Applied Mechanics, 1996, 28(5): 513-521.
 Citation: Jiachun Li, . A COUPLING MODEL OF WATER-HEAT MOVEMENT IN THE SOIL OF SAND-FIXATION AREA[J]. Chinese Journal of Theoretical and Applied Mechanics, 1996, 28(5): 513-521.

## A COUPLING MODEL OF WATER-HEAT MOVEMENT IN THE SOIL OF SAND-FIXATION AREA

• 摘要: 根据Ｐｈｉｌｉｐ与Ｖｒｉｅｓ提出的土壤中水热交换的耦合理论，建立了植物固沙区土壤水热运移的耦合模型，考虑了液态水和汽态水运移对温度的变化，分析了植物根系吸水对土壤水热交换的影响，给出了植物蒸腾量、土壤蒸发量、根系汲水率及土壤表面热通量等有关变量的计算公式．利用本模式并采用具有二阶精度的Ｃｒａｎｋ－Ｎｉｃｏｌｓｏｎ格式对非线性扩散方程进行离散，对沙坡头植物固沙区土壤水热交换过程进行了数值模拟，模拟结果和实测值进行了比较，总体上符合较好，证明本模型具有实用价值，可为改造沙漠提供科学依据

Abstract: Based on the Phillips & Vriès' theory, we have suggested a coupling model for simulating water-heat movement in the sand soil with vegetation. The effects of temperature and vegetation roots on the exchange of water and heat between atmosphere and land are firstly analyzed. Then, we have provided the formulae to estimate soil evaporation, canopy transpiration, water-absorbing rate of root system and heat flux in soil. A Crank-Nicolson difference scheme is constructed to solve nonlinear diffusion equation to...

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