naa a22 4500 51075144X CHVBK 20180411083106.0 cr unu---uuuuu 180411e20130401xx s 000 0 eng 10.1007/s11270-013-1491-7 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1491-7 Mathematical Modeling of Differentiation Processes in Porous Media During Soil Vapor Extraction (SVE) Remediation of Contaminated Soil/Water [Elektronische Daten] [Ying Lu, Wei Fan, Y. Yang, X. Du, G. Zhang] Soil vapor extraction (SVE) is one of the most effective remediation technologies for soil and groundwater contamination. Soil particles can be mobilized by air perturbation during SVE, resulting in the differentiation of porous media, which has not been well addressed. This paper developed a numerical method to study the flow pattern and quantify the change of porous media for the first time. Based on the mass equilibrium and Darcy's law, a two-phase water-air flow model was constructed with integration of saturation, relative permeability, and capillary pressure during SVE. Relationship between porosity and saturation was deduced and coupled with the two-phase flow model for quantifying change of porous media in real time. Results reveal that both porosity and permeability increase sharply in the early stage of SVE then gradually to a quasi-steady state. These increases in vadose zone tapered off with distance from the SVE screen and the steady period occurred later as well. The influence radius of a single SVE well and the change degree in porosity and permeability of media were proportional to the extraction vacuum and the driving coefficient C, which is more sensitive than extraction vacuum according to the simulation results. Knowledge from this modeling exercise provides a useful tool to estimate the change of remediated zone and assess the environmental risk of remedial activities at real-world contamination sites. Springer Science+Business Media Dordrecht, 2013 Particles migration nationallicence Soil vapor extraction nationallicence Two-phase flow nationallicence Porous media nationallicence Mathematical modeling nationallicence 0, t : Subscript denoting initial and a certain time point nationallicence a : Subscript denoting air nationallicence C : The ratio of the cumulative volume of mobile particles to that of air flow nationallicence E : The ratio of the cumulative mass of mobile particles to the cumulative volume of air flow [kilogram per cubic meter] nationallicence g : Gravity [meter per square second] nationallicence k : Intrinsic permeability of porous media [square meter] nationallicence k ra,iw : Relative permeability of air or water nationallicence M p : Mass of mobile particles [kilogram] nationallicence m : van Genuchten parameter nationallicence p : Subscript denoting particles nationallicence P : Pressure [pascal] nationallicence P atm : Atmospheric pressure [pascal] nationallicence P c : Capillary pressure [pascal] nationallicence P E : Extraction pressure [pascal] nationallicence P v : Vacuum pressure [pascal] nationallicence S a,w : Saturation of air or water in pores nationallicence v : Flow velocity vector of water (w)/air (a) [meter per second] nationallicence V : Volume of water/air [cubic meter] nationallicence w : Subscript denoting water nationallicence z : Vertical coordinate [meter] nationallicence α : van Genuchten parameter [per meter] nationallicence μ : Fluid viscosity [pascal second] nationallicence ρ : Density of water (w)/air (a) [kilogram per cubic meter] nationallicence φ : Porosity of porous media nationallicence Lu Ying Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, 130021, Changchun, People's Republic of China aut Fan Wei Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 130012, Changchun, China aut Yang Y. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, 130021, Changchun, People's Republic of China aut Du X. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, 130021, Changchun, People's Republic of China aut Zhang G. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 130012, Changchun, China aut Water, Air, & Soil Pollution Springer Netherlands 224/4(2013-04-01), 1-8 0049-6979 224:4<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1491-7 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1491-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lu Ying Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, 130021, Changchun, People's Republic of China aut NATIONALLICENCE 700 1- Fan Wei Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 130012, Changchun, China aut NATIONALLICENCE 700 1- Yang Y. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, 130021, Changchun, People's Republic of China aut NATIONALLICENCE 700 1- Du X. Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, 130021, Changchun, People's Republic of China aut NATIONALLICENCE 700 1- Zhang G. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 130012, Changchun, China aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/4(2013-04-01), 1-8 0049-6979 224:4<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer