多孔介质中污染物浓度相关运移的非线性随机游走方法
A nonlinear random walk approach to concentration-dependent contaminant transport in porous media
摘要：
提出了一个非线性随机游走模型来描述多孔介质中密集污染羽流的动力学行为。浓度和速度场之间的耦合被发现，使运输显示非菲克特征。污染物的空间分布和时刻的定性行为进行了探讨的帮助下，蒙特卡罗模拟，在连续时间随机游走的方法。模型的结果进行了比较，在均匀和饱和的垂直柱变密度污染物传输的实验测量。
英文摘要：
We propose a nonlinear random walk model to describe the dynamics of dense contaminant plumes in porous media. A coupling between concentration and velocity fields is found, so that transport displays non-Fickian features. The qualitative behavior of the pollutant spatial profiles and moments is explored with the help of Monte Carlo simulation, within a Continuous Time Random Walk approach. Model outcomes are then compared with experimental measurements of variable-density contaminant transport in homogeneous and saturated vertical columns.
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