An Experimental Study on DNAPL Fingering Mechanism in Saturated Porous Media

概要

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Knowledge of dense non-aqueous phase ,liquid (DNAPL) fingering phenomena in watersaturated porous media, which has not been investigated thoroughly, can be useful in gaining deeper insight into the contaminant transport and remediation. Laboratory experiments on fingering behaviors of trichloroethylene (TCE) through saturated porous media, randomly packed with uniform glass spheres in transparent glass box, were carried out. A basic mathematical model was developed and the experimental data on TCE fingering were interpreted based on it. The fingers grew almost linearly with time. The effective porosity of the media ne with three kind sizes of glass sphere (d =1, 2 and 3mm) were between 4.0x10＾<-2> and 5.0x10＾<-2> irrespective of glass sphere size, while their invasion factor kr increased with pore size. Numerical values of k, varied from 5.0xlO-4 to 5.0x10?2 in this study. TCE mobility and other fmgering characteristics were evaluated by using Zhang and Smith's mobileimmobile-zone (MIZ) model. Findings showed that core diameter t5c of the fingers were almost the same while size of immobile zone t5f increased with finger Reynolds number Re and relative intrinsic permeability Krd , which suggested that TCE with smaller mobility occupied wider pore space in the media. Values of Re in this study were in between 4.0 and 110.0. Thus, in this study we will deal with the difficulties of the fmgering phenomenon.
社団法人土木学会の論文
2003-11-01