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Approximate models for bacteria leaching through porous media

机译:细菌通过多孔介质浸出的近似模型

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To study leaching of bacteria through complex soils, the researcher has to employ numerical methods as the known theoretical methods available are too restricted. Direct simulation of diffusion faces the problem of absence of statistical stability as the diffusion times vary dramatically between different realisations and soil samples. We propose an approximation to the original leaching problem which is fast to simulate and is shown to give reliable approximation to the exit times in the whole range of parameter values including the problematic values that exhibit extreme behaviour. In addition, we have shown that a completely different type of pore structure, such as produced by tunnels through the soil, does not greatly affect diffusive properties when we are not close to the percolation threshold.
机译:要研究细菌在复杂土壤中的浸出,研究人员必须采用数值方法,因为已知的理论方法太受限制。扩散的直接模拟面临着缺乏统计稳定性的问题,因为不同的实现和土壤样品之间的扩散时间差异很大。我们提出了一种对原始浸出问题的近似方法,该方法可以快速进行模拟,并显示出可以可靠地近似于整个参数值范围内的出口时间,包括表现出极端行为的问题值。另外,我们已经表明,当我们接近渗滤阈值时,完全不同类型的孔隙结构(如通过土壤的隧道产生的孔隙结构)不会极大地影响扩散性能。

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