| Cite this article: | 江训才,冯洪川,祝晓彬,等.入渗补给范围对包气带中水气两相流运移过程影响数值模拟研究[J].灌溉排水学报,2022,():-. |
| JIANG Xuncai,FENG Hongchuan,ZHU Xiaobin,et al.入渗补给范围对包气带中水气两相流运移过程影响数值模拟研究[J].灌溉排水学报,2022,():-. |
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| DOI： |
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| Numerical simulation of the influence of infiltration range on the transport process of water-gas two-phase flow in vadose zone |
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JIANG Xuncai1,2, FENG Hongchuan1,2, ZHU Xiaobin1,2, WU Jichun1,2, WU Jianfeng1,2, xiong guiyao3
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1.Key Laboratory of Surficial Geochemistry,Ministry of Education/ School of Earth Sciences and Engineering,Nanjing University,Nanjing;2.China;3.Nanjing University
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| Abstract: |
| Abstract:【Objective】The process of groundwater recharge by infiltration of irrigation water and precipitation through vadose zone is a process of water-gas two-phase displacement and migration. It is of great significance to study the influence of infiltration recharge range on the migration process of water-gas two-phase flow in vadose zone for the optimization of irrigation engineering scheme and the improvement of water resources utilization efficiency.【Method】Based on the multiphase flow numerical simulation software TOUGH2 / EOS3, a numerical model of water-gas two-phase flow was constructed to simulate and analyze the influence of different infiltration recharge ranges on the water infiltration recharge process in the vadose zone.【Result】The study found the existence of critical infiltration range L0, in the upper and lower sides of this critical range, the influence of different infiltration recharge range on water migration law in vadose zone was quite different. On this basis, the factors affecting the critical infiltration range are big difference【Conclusion】The numerical simulation results show that the change of capillary pressure has a great influence on the critical infiltration range, and the removal of capillary pressure will make the water seepage in the vadose zone more concentrated in the vertical direction, and the influence of infiltration range on water infiltration is small. Within a certain range, the thickness of aeration zone 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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