滨海含水层氯苯多相迁移数值模拟

郑天元; 薛茹晶; 郝玉洁; 李培华; 王玉

doi:10.3799/dqkx.2026.128

Volume 51 Issue 6

Jun. 2026

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Article Navigation > Earth Science > 2026 > 51(6): 2323-2335

Zheng Tianyuan, Xue Rujing, Hao Yujie, Li Peihua, Wang Yu, 2026. Numerical Simulation of Chlorobenzene Multiphase Migration in a Coastal Aquifer. Earth Science, 51(6): 2323-2335. doi: 10.3799/dqkx.2026.128

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Zheng Tianyuan, Xue Rujing, Hao Yujie, Li Peihua, Wang Yu, 2026. Numerical Simulation of Chlorobenzene Multiphase Migration in a Coastal Aquifer. Earth Science, 51(6): 2323-2335. doi: 10.3799/dqkx.2026.128

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Numerical Simulation of Chlorobenzene Multiphase Migration in a Coastal Aquifer

doi: 10.3799/dqkx.2026.128

1.
College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
2.
Technical Center for Soil, Agriculture and Rural Ecology and Environmental, Ministry of Ecology and Environment, Beijing 100012, China

Received Date: 2026-01-30
Publish Date: 2026-06-25

Abstract

Abstract

To reveal the regulatory mechanism of the variable-density flow field induced by seawater intrusion on the multiphase migration pathways and interphase mass exchange of dense non-aqueous phase liquids (DNAPL), this study developed a coupled variable-density flow, multiphase flow, and solute transport numerical model using chlorobenzene as an example, systematically simulating its infiltration, redistribution, and dissolved plume evolution. The results indicate follows: (1) The NAPL-phase chlorobenzene vertically infiltrates under gravity-dominated conditions, forming an asymmetric contaminant pool above the aquitard. (2) The saltwater wedge significantly alters the migration pathway of dissolved-phase chlorobenzene, with density gradients driving its upward movement along the freshwater-saltwater interface and accumulation in the mixing zone, while the peak discharge flux to the sea decreased by 62% compared to the scenario without seawater intrusion. (3) An increase in hydraulic conductivity (K) accelerates the migration of both NAPL-phase and dissolved-phase chlorobenzene toward the marine boundary, while enhancing the accumulation of the dissolved phase within the mixing zone. This study elucidates the retention mechanism of the mixing zone for DNAPL migration and confirms that this zone represents a non-negligible long-term secondary pollution source in coastal groundwater environmental risk assessments.
- coastal aquifer,
- seawater intrusion,
- DNAPL,
- chlorobenzene,
- multiphase flow numerical simulation,
- hydrogeology,
- environmental geology

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References(42)

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