DENG Yaping, ZHANG Ye, SHI Xiaoqing, WU Jichun. Study on the migration of dense non-aqueous phase liquids in heterogeneous fractured media[J]. Advances in Water Science, 2015, 26(5): 722-730. DOI: 10.14042/j.cnki.32.1309.2015.05.014
Citation: DENG Yaping, ZHANG Ye, SHI Xiaoqing, WU Jichun. Study on the migration of dense non-aqueous phase liquids in heterogeneous fractured media[J]. Advances in Water Science, 2015, 26(5): 722-730. DOI: 10.14042/j.cnki.32.1309.2015.05.014

Study on the migration of dense non-aqueous phase liquids in heterogeneous fractured media

  • Due to the strong heterogeneity of fractured media, the migration behavior of Dense Non-Aqueous Phase Liquids (hereafter referred to as DNAPLs) in fractured media is more complicated than in pore media. Binary variables of fractured media are initially simulated using the indicator simulation and finally modified with simulated annealing algorithm to generate the stochastic permeability fields (SPF). By simulating the migration of DNAPLs in fractured media with the T2VOC, we can study the effects of correlation length, anisotropy ratio, inclination of asperity contacts and degree of heterogeneity on the migration and distribution of DNAPLs. Numerical analysis results suggest that a worse correlation among adjacent asperity contacts leads to a larger pollution scope of DNAPLs; a larger anisotropy ratio and inclination lead to more residual DNAPLs; with increasing correlation length and anisotropy ratio as well as decreasing inclination, the front surface migration rate of DNAPLs increases; and the increasing heterogeneity of permeability causes an increasing saturation of DNAPLs accumulated in local asperity contacts, and a decreasing migration rate.
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