土壤渗透中的渗透分形分布

• 作 者: 杨昌兵
• 出 处: 世界地质
• 发表日期: 1994年04期
• 关键词: 分形 非饱和渗流 渗透系数 渗透率 野外数据 谱分析法 随机过程 变差函数 统计参数 分维值

土壤中的渗流与运移随机分析通常假定土壤渗透率是一平稳均质的随机过程。尽管这样，一些野外数据表明：渗透率分布具有较大范围相关性的分形特征。本文中分析的就是这样一组数据。同时也研究了渗透系数分布的分形特征与非饱和流的统计参数的关系。假定土壤中渗流在稳定状态条件下，利用蒙特卡罗（ＭｏｎｔｅＣａｒｌｏ）模拟生成渗透系数分形分布。模拟的结果同非饱和渗流的谱分析法得到的理论结果进行了比较。

Percolation and transport in soil Stochastic analysis often assumes that soil permeability is a stably homogeneous random process. In spite of this, some field data show that the permeability distribution has fractal characteristics with a larger range of correlations. This article analyzes is such a set of data. At the same time, the relationship between the fractal characteristics of the permeability coefficient distribution and the statistical parameters of the unsaturated flow is also studied. The fractal distribution of permeability coefficient is generated by Monte Carlo simulation assuming that the seepage in the soil is under steady state conditions. The simulation results are compared with the theoretical results from the spectral analysis of unsaturated seepage.