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中文摘要：
目前大多数模拟包气带中降雨入渗的过程均采用单相流,未考虑气相对液相（水流）的影响。本文基于多相流数值模拟程序TOUGH2,考究降雨入渗时水驱替空气的水气二相流过程,对比单相流和多相流模拟结果的不同。数值模拟结果显示,对于稳定渗流问题,单相流和水气二相流模拟结果相近。而对于非稳定渗流问题,基于水气二相流模型模拟结果更为可靠,气相的存在对水流的入渗起明显的阻滞作用,采用单相流模型则易高估模拟区包气带中的水饱和度。
英文摘要：
The single phase flow is often used for modeling seepage in vadose zone at present,in which the influence of gas phase to fluid phase is always neglected.The numerical simulation program TOUGH2 for multiphase system is used in this paper to compare the difference between the water-gas tow phase flow model and the single phase flow model.The numerical results show that the difference between the single phase and the two phase model could be neglected for steady flow condition,but the results from the two phase model are more accurate for the unsteady flow condition.The air in the vadose zone blocks the water movement.As a result,the fluid saturation in vadose zone is always overrated when using single phase flow.
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