Abstract
The migration behaviour and long-term distribution of Light Nonaqueous Phase Liquids (LNAPLs) are greatly influenced by the geological conditions of the sites. In order to investigate the influence of geological heterogeneity on it, the migration process of LNAPLs in a two-dimensional site was numerically studied in this research. Typical conditions including one homogeneous soil layer, multi-layered strata and lens of clayey soil were specially considered. Calculation results indicate that the contour map of the mass ratio of LNAPLs gradually develops from a circular area into an umbrella area if it is leaked from a point source such as underground storage tank. Once the contaminant front of the LNAPLs arrives at the margin of the capillary saturated zone, their horizontal migration distance reaches the maximum value. When lens of low permeability soil area exists, it can effectively prevent the downward migration and promote the horizontal migration of LNAPLs. In the case of multiple sand layers, the migration behaviour of LNAPLs is mainly affected by the permeability of each layer of sand. Lower permeability soil layer will not only slow down the vertical movement of LNPLs, but also promotes their horizontal migration. Such results may help to scientifically design the vertical barriers and determine the optimum soil vapour extraction systems according to the geological heterogeneity of the real sites.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Project No. 41672280, 41330641).
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Zhang, J., Liu, Z., Liu, S., Wei, Q., Wang, Y., Lu, L. (2019). Study on Influence of Geological Heterogeneity on Migration of LNAPL in Contaminated Site Through Numerical Analysis. In: Zhan, L., Chen, Y., Bouazza, A. (eds) Proceedings of the 8th International Congress on Environmental Geotechnics Volume 1. ICEG 2018. Environmental Science and Engineering(). Springer, Singapore. https://doi.org/10.1007/978-981-13-2221-1_95
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DOI: https://doi.org/10.1007/978-981-13-2221-1_95
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