摘要
为了模拟大田试验的水分分布,对蒸发条件下含根系吸水项的一维非饱和土壤水分运动方程,采用新的数值方法--楔形基配点法进行数值模拟。与传统的差分格式和有限元相比,计算格式简单、方便、实用,并在计算时间和计算误差方面更具有优势。应用土壤剖面含水率的实测值与本文算法的模拟值对模型进行了验证,结果表明,模拟值与实测值之间的拟合效果好,模拟精度在98%以上,表明所建模型能比较真实地反映蒸发条件下土壤水分的运动情况。
To simulate water distribution in field experiment, a new numerical method, Ridge Basis Functions Collocation Method, is presented to give the numerical solutions of one-dimensional water movement in unsaturated soil during evaporation （the water uptake by plant roots）. Compared with the traditional finite difference method and finite element method, the new method IS easier, more convenient and practical for use. And the advantageous of the method is less calculating ttme and small error. According to the comparison between the results of simulation and data of field experiment, it shows that the simulated values are coincide well with measured values, and the simulating precision are above 98 % ,which shows that the proposed model can relatively truly reflect the status of soil moisture movement under evaporation.
出处
《灌溉排水学报》
CSCD
北大核心
2011年第6期44-48,共5页
Journal of Irrigation and Drainage
基金
国家自然科学基金项目(50879067)
陕西省教育厅基金项目(2010JK719)
西安理工大学基金项目(108-210918)
关键词
蒸发
土壤水分运动
楔形基函数
配点法
evaporation
soil moisture movement
ridge basis function
collocation method
