重庆北碚区土壤水热耦合模型研究

以南方的土壤和气候条件为背景,在裸露土壤的非恒温模型一维非饱和水流运动方程后增加根系吸水函数项得到作物地的土壤一维非饱和水流运动方程,与土壤中非稳态热流方程构成作物地的土壤水热耦合运移模型,联合初始边界条件,采用隐式差分法进行数值求解.结果表明：该水热运移耦合模型模拟值与实测值基本吻合,其拟合精度随土层深度增加而提高.

Studies on Numerical Model Coupling Soil Moisture and Thermal Transfer of Crop Field in Beibei District of Chongqing

The numerical model coupling soil moisture and thermal transfer of the crop field was consisted of the soil unbalanced thermodynamics equation, the one-dimensional unsaturated water flow equation through homogeneous soil which was the sum of the non-isothermal model in the bare soil and the water-uptake-by-root function. Associated with the initial and boundary conditions, Newton-Naphson iterative technique adopted, the numerical model was computed, while the variables and the parameters of the function were confirmed. The results showed that the simulated values were very close to the measurements. As the soil layer increased, the accuracy of simulative results would be improved.