摘要
近代对水分循环的研究,倾向于将土壤-植物-大气视为物理上的连续体,称之为SPAC系统。本文应用土壤水动力学、微气象学和能量平衡原理,建立了作物生育期SPAC系统的水热迁移和转化模型,并采用全隐式有限差分法进行离散,通过自动调节计算步长和反复迭代等方法设计了数值模拟程序,对冬小麦返青至成熟期的水热状况进行了模拟,结果表明,模型真实地反映了作物生长过程中土壤的水热状况和蒸散发动态过程,可用于田间墒情预报,并制定适宜的灌溉定额。
Soil-plant- atmosphere system tends to be regarded as continuum in the physics of water circulation in the field, and is called SPAC. Based on the theory of soil water dynamics, micrometeorology and energy balance principle, a model of water and heat transfer in SPAC is established. The numerical simulation is realized by using implicit finite difference scheme and iteration method with automatically changing time steps. Water and heat condition during winter wheat growing period from greening to mature is analyzed and discussed. It shows that this model can simulate the process of water and heat transfer in the soil and evapotranspiration, and is very important for soil moisture prediction and good irrigation norm.
出处
《水动力学研究与进展(A辑)》
CSCD
北大核心
2005年第3期307-312,共6页
Chinese Journal of Hydrodynamics
基金
中国科学院"百人计划"和知识创新资助项目(KZCX2-SW-317/CX10G-E01-08)国家自然科学基金资助项目(50279049
50239050)
关键词
SPAC系统
水热输移
蒸散发
能量平衡
数值模拟
SPAC
water and heat transfer
evapotranspiration
energy balance
numerical simulation