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Simulating Water Uptake by Tree Roots: An Initial Assessment

机译：通过树根模拟水吸收：初步评估

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摘要

This paper explores issues related to the numerical simulation of moisture migration patterns associated with vegetation. Particular attention is given to prediction of soil suction variations in the unsaturated zone and in the vicinity of a single mature tree. A preliminary investigation is presented based on the use of Richard's Equation for unsaturated moisture flow incorporating a sink term. A numerical solution has been achieved via the finite element method for spatial discretisation along witha finite difference time-marching scheme. The model is first verified against a one-dimensional simulation for a uniform crop cover. An axi-symmetric solution is then developed to represent water-uptake near an established tree. Field data and non-linear hydraulic properties have been sourced from independent published data. Numerical results have been validated by direct comparison to experimental/field data. The results obtained show a realistic moisture migration pattern can be achieved in this manner.
机译：本文探讨了与植被相关的水分迁移模式的数值模拟相关的问题。特别注意预测不饱和区的土壤吸力变化和单个成熟树附近。基于使用Richard等式的不饱和水分流量的使用，提出了初步调查。通过有限元分离子沿着有限差分时间线程方案，通过有限元方法实现了数值解决方案。首先验证模型，用于均匀作物覆盖的一维模拟。然后开发了一种轴对称的解决方案以在已建立的树附近表示水吸收。现场数据和非线性液压性能已从独立发布的数据中源。通过与实验/现场数据直接比较验证了数值结果。获得的结果显示了以这种方式实现现实的水分迁移模式。

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