渗流模型的实现，点渗流集团尺寸，渗流概率的计算-Percolation model realization, point seepage group size, the calculation of the probability of seepage

多孔介质污染物迁移动力学地下水一维渗流的数学模型 差分求解-Contaminant migration in porous media groundwater dynamics differential one-dimensional mathematical model for solving seepage