地下水溶质运移数值模拟弥散问题再探  

The Research Again on the Dispersion Problem of Numerical Simulation in Groundwater Solute Transport

作　　者：徐文彬[1] 柴军瑞[1] 方涛[1] 

机构地区：[1]三峡大学土木水电学院,湖北宜昌443002

出　　处：《地下水》2007年第3期20-24,共5页Ground water

摘　　要：将水动力弥散方程用有限差分法进行离散后编程,通过一具体实例验证其正确性,使之模拟在对流项占优情况下的示踪剂浓度分布,然后针对出现的数值过量、波动和弥散现象介绍国内外一直以来常用的改善或消除方法,提出新的改善方案—从数值随时间步长变化的特点入手,并通过同样的实例验证其可行性,最后就这一方案的优缺点作进一步分析。Discrete the hydrodynamic dispersion equation with the finite difference method and then program, the article sets an example to prove it, uses the calculating program to simulate the result value under convection dominated transport. Next for excessive value, fluctuating and dispersion phenomenon, it introduces the common methods of improving or eliminating the value dispersion, puts forward a new method which begins with the changed characteristic of value after a time step, through the same example to prove its executive, at last, analyzes advantages and defects of the method.

关 键 词：有限差分 对流项占优 弥散 改善方案 

分 类 号：X523[环境科学与工程—环境工程]