摘要
给出非饱和土壤渗透计算求解理查兹方程的有限差分法。该计算值与实测值吻合较好。这个方法使用了水土势双曲正弦变换的隐式差分格式。砂土、壤土及粘土范围内的渗透过程在微机上几十秒钟内即可被模拟出来，其误差很小。非饱和土壤的渗透特性可以划分为地表积水前、地表积水后及退水过程三种类型。
A finite difference method for solving Richards′ Equation in one dimension is presented, and the calculated results agree well with the observed data. The method is an implicit iterative scheme with a hyperbolic sine transform for the matric potential. The infiltration in a range of soils for sand, silt loam and clay can be simulated in a few seconds on a personal computer with errors of only a few percent in the amount of soil water. The behaviour of infiltration in unsaturated soil is divided into three phases: before ponding time, after ponding time and recession.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
1998年第3期231-236,共6页
Advances in Water Science
基金
意大利卡拉布里亚大学合作项目
关键词
非饱和土壤
理查兹方程
渗透
隐式迭代格式
unsaturated soil
Richards′ Equation
infiltration
implicit iterative scheme, hyperbolic sine transform.
