非均匀土壤中溶质运移的数值模拟  

Numerical simulation for solute transport through heterogeneous soils

作　　者：武新乾[1] 张德生[1] 

机构地区：[1]西安理工大学理学院,陕西西安710048

出　　处：《纺织高校基础科学学报》2003年第1期5-9,24,共6页Basic Sciences Journal of Textile Universities

基　　金：国家自然科学基金资助项目(59879022)

摘　　要：给出了非均匀土壤中考虑水动力弥散尺度效应的一维溶质运移两区模型.在初始浓度为零,半无限一维空间内常数浓度边界条件和常数通量边界条件下,采用特征有限元法对模型进行离散,得到了适合非均匀土壤中考虑水动力弥散尺度效应的一维溶质运移数值模型并作了数值计算.计算所产生的误差较小,符合实际工作的要求.The two-region model of one-dimensional solute tra nsport through heterogeneous soils considering scale-dependent dispersion is presente,and the model is discretized by characteristic finite element method under the initial concentration zero and constant concentration boundary condition or constant flux boundary condition of a semi infinite one-dimensional space.A numerical model of one-dimensional solute transport through heterogeneous soils considering scale-dependent dispersion is established and the numerical calculation is performed.The errors caused by the numerical calculation are so little that the numerical model is suitable for the demand of practical work.

关 键 词：溶质运移 数值模拟 对流-弥散方程 两区模型 特征有限元法 非均匀土壤 

分 类 号：S153.5[农业科学—土壤学] O241.82[农业科学—农业基础科学]