寒区多孔介质中LNAPL迁移的多场耦合模拟

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Abstract A multi-field coupling model of temperature, flow and chemical fields including water, gas, NAPL, and solid (ice) phases was established to quantitatively simulate the migration and distribution of LNAPL under freezing condition during LNAPL leakage. By comparing the LNAPL flow model under non-freezing conditions, the simulated results found that LNAPL would undergo different migration behavior due to the formed ice under freezing conditions. The formed ice prevented LNAPL from infiltrating and generated freezing potential to make LNAPL migrate to the surface. The difference of LNAPL mass flux was -51.1% when the LNAPL infiltration reached stable under freezing/non-freezing conditions. Under freezing conditions, the speed of LNAPL plume in the horizontal direction was greater than that under non-freezing conditions. The maximum predicted error of LNAPL dissolved and volatilized components during the infiltration process was 2.4% and -24.9%, respectively, if freezing condition was not considered. However, the freezing condition had little effect on the dissolved and volatilized components of LNAPL when the LNAPL infiltration reached stable, and only the volatilized component had an error of 1.8%. But the adsorbed component was reduced, and the error was -6.6%.

Key words： light non-aqueous fluid(LNAPL) multi-field multi-phase coupling freezing potential solute transport

Received: 06 August 2021

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	FU Xiao-qin
	SHI Xiao-qing
	JIANG Jian-guo
	WU Ji-chun

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FU Xiao-qin,SHI Xiao-qing,JIANG Jian-guo等. Multi-field coupling simulation of LNAPL migration in cold regions[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(3): 1346-1358.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I3/1346

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