| 引用本文: | 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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| 摘要: |
| 摘 要：【目的】灌溉水和降水等经包气带入渗补给地下水的过程是一个水气两相驱替运移的过程，研究入渗补给范围对包气带中水气两相流迁移过程影响，对灌溉工程方案优化以及提高水资源利用率具有重要意义。【方法】基于多相流数值模拟软件TOUGH2/EOS3构建水气两相流数值模型，模拟分析不同入渗补给范围对包气带中水分入渗补给过程的影响。【结果】研究发现了临界入渗范围L0的存在，在此临界值范围上下两侧，不同入渗补给范围对包气带中水分运移规律的影响有较大差异。在此基础上，进一步探讨影响临界入渗范围的因素。【结论】数值模拟结果表明，毛管压力的变化对临界入渗范围的影响较大，取消毛管压力作用会使包气带中水分渗流在垂直方向更加集中，此时入渗范围对水分入渗的影响较小；在一定范围内，包气带厚度与临界入渗范围正相关，补给速率与临界入渗范围负相关。 |
| 关键词: 包气带水分运移；临界入渗范围；TOUGH2/EOS3；水气两相流；数值模拟 |
| DOI： |
| 分类号:P641.2 |
| 基金项目:国家重点研发计划场地土壤污染成因与治理技术专项课题(2019YFC1804300)；国家自然科学基金资助项目(42072274; 41730856) |
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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 |
