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首页> 外文期刊>Transport in Porous Media >Analytical Solution to Subsurface Air Pressure in a Three-Layer Unsaturated Zone with Atmospheric Pressure Changes
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Analytical Solution to Subsurface Air Pressure in a Three-Layer Unsaturated Zone with Atmospheric Pressure Changes

机译：大气压力变化的三层不饱和区地下气压的解析解

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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.
机译：在这项研究中，在三层非饱和带中开发了一种由时变大气压力波动引起的一维垂直气流的解决方案。使用傅立叶级数分析将离散的大气压数据转换为连续边界条件。该解决方案用于解释先前研究中报道的三层非饱和带中的现场气压数据。新的解决方案通过减少所需的数据测量和输入来改进以前的解决方案。通过与COMSOL Multiphysics中开发的数值解决方案进行比较，发现该新解决方案对于本研究而言足够准确。给定必要的水文地质参数，新的解决方案能够计算出已知气压的指定深度以上每一层的透气率。新解决方案的灵敏度分析表明，透气性较低的层的位置，厚度和透气性对大气压力波动的传播产生了较大影响。与低渗透层上方的土壤层相比，低渗透层下面/下方的土壤层中充气孔隙率的变化可能导致更大的振幅衰减和气压的相位滞后。

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  • 来源
    《Transport in Porous Media》 |2012年第3期|p.461-474|共14页
  • 作者

    Jian Li; Kehua You; Hongbin Zhan; Guanhua Huang;

  • 作者单位

    Department of Irrigation and Drainage, College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, People's Republic of China,Chinese Academy of Agricultural Engineering, Ministry of Agriculture, Beijing 100125, People's Republic of China;

    Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843-3115, USA;

    Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843-3115, USA, Faculty of Engineering and School of Environmental Studies, China University of Geosciences, Wuhan, Hubei 430074, People's Republic of China;

    Department of Irrigation and Drainage, College of Water Conservancy and Civil Engineering, China Agricultural University, Beijing 100083, People's Republic of China, Chinese-Israeli International Center for Research and Training in Agriculture, China Agricultural University, Beijing 100083, People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    airflow; analytical solution; layered unsaturated zone; air permeability;

    机译：空气流动;分析溶液;分层不饱和带透气性;

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