Analytical Solution to Subsurface Air Pressure in a Three-Layer Unsaturated Zone with Atmospheric Pressure Changes

文献类型： 外文期刊

第一作者： Zhan, Hongbin

作者： Zhan, Hongbin;Zhan, Hongbin;Li, Jian;Huang, Guanhua;Li, Jian;You, Kehua;Zhan, Hongbin;Huang, Guanhua

作者机构：

关键词： Airflow;Analytical solution;Layered unsaturated zone;Air permeability

期刊名称：TRANSPORT IN POROUS MEDIA （ 影响因子：3.019； 五年影响因子：2.914 ）

ISSN： 0169-3913

年卷期： 2012 年 93 卷 3 期

页码：

收录情况： SCI

摘要： In this study, a solution to one-dimensional vertical airflow induced by the time-dependent atmospheric pressure fluctuations is developed in a three-layer unsaturated zone. The discrete atmospheric pressure data are transformed into a continuous boundary condition using the Fourier series analysis. The solution is applied to interpret the field air pressure data in a three-layer unsaturated zone reported in previous studies. The new solution improves the previous solution by reducing the required data measurement and input. The new solution is found to be accurate enough for the purpose of this study by comparing with a numerical solution developed in COMSOL Multiphysics. Given the necessary hydrogeological parameters, the new solution is capable of calculating the air permeability of each layer above a specified depth where the air pressures are known. Sensitivity analysis of the new solution shows that location, thickness, and air permeability of the less permeable layer impose large influence on the propagation of the atmospheric pressure fluctuations. Variations of air-filled porosity in soil layers in/below the less permeable layer may lead to greater amplitude attenuation and phase lag of air pressure than those in soil layers above the less permeable layer.

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