入渗补给范围对包气带水气两相流运移过程影响的数值模拟研究  

Numerical Simulation of the Influence of Infiltration Range on Gas and Water Flow in Vadose Zone

作　　者：江训才 冯洪川 祝晓彬 吴吉春 吴剑锋 熊贵耀 JIANG Xuncai;FENG Hongchuan;ZHU Xiaobin;WU Jichun;WU Jianfeng;XIONG Guiyao(Key Laboratory of Surficial Geochemistry,Ministry of Education/School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China;Key Laboratory of Earth Fissures Geological Disaster,Ministry of Natural Resources,Nanjing 210049,China)

机构地区：[1]南京大学地球科学与工程学院,表生地球化学教育部重点实验室,南京210023 [2]自然资源部地裂缝地质灾害重点实验室,南京210049

出　　处：《灌溉排水学报》2022年第11期78-84,共7页Journal of Irrigation and Drainage

基　　金：国家重点研发计划场地土壤污染成因与治理技术专项(2019YFC1804300);国家自然科学基金项目(42072274,41730856,U2167212)。

摘　　要：【目的】基于数值模拟方法揭示入渗补给范围对包气带中水气两相流运移过程的影响。【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】研究表明存在临界入渗范围L0,大于和小于此临界入渗补给范围时,包气带中水分运移规律差异明显。在此基础上,进一步探讨了影响临界入渗范围的因素。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,不考虑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。【结论】在一定范围内,包气带厚度与临界入渗范围呈正相关,补给速率与临界入渗范围呈负相关。【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.

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 

分 类 号：P641.2[天文地球—地质矿产勘探]