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| DOI：10.13522/j.cnki.ggps.2022273 |
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| Numerical Simulation of the Influence of Infiltration Range on Gas and Water Flow in Vadose Zone |
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JIANG Xuncai, FENG Hongchuan, ZHU Xiaobin, WU Jichun, WU Jianfeng, XIONG Guiyao
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1.Key Laboratory of Surficial Geochemistry, Ministry of Education/School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China;
2. Key Laboratory of Earth Fissures Geological Disaster, Ministry of Natural Resources, Nanjing 210049, China
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| Abstract: |
| 【Objective】To reveal the influence of infiltration recharge range on the water-gas two-phase flow transport process in the package-gas zone based on numerical simulation method.【Method】 Based on the multiphase flow simulation software TOUGH2/EOS3, a numerical model of water-gas two-phase flow was constructed to simulate and analyze the effect of different infiltration recharge ranges on the water infiltration recharge process in the packaged gas zone.【Result】Show that there is a critical infiltration range L0, and the water transport pattern in the package-gas zone differs significantly when the infiltration recharge range is larger and smaller than this critical infiltration range. On this basis, the factors affecting the critical infiltration range are further explored. The numerical simulation results show that the change of capillary pressure has a greater influence on the critical infiltration range, and disregarding the effect of capillary pressure will make the water infiltration flow in the package gas zone more concentrated in the vertical direction, at which time the infiltration range has less influence on the water infiltration.【Conclusion】In a certain range, the thickness of the air envelope is positively correlated with the critical infiltration range, and the recharge rate is negatively correlated with the critical infiltration range. |
| Key words: water transport in vadose zone; critical infiltration range; TOUGH2/EOS3; water-gas two-phase flow; numerical simulation |
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