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Numerical Inverse Interpretation of Single‐Hole Pneumatic Tests in Unsaturated Fractured Tuff
Author(s) -
Vesselinov Velimir V.,
Neuman Shlomo P.
Publication year - 2001
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.2001.tb02358.x
Subject(s) - borehole , dimensionless quantity , inverse , porosity , permeability (electromagnetism) , air permeability specific surface , geology , nonlinear system , airflow , mechanics , porous medium , geometry , geotechnical engineering , mathematics , materials science , thermodynamics , physics , chemistry , composite material , biochemistry , layer (electronics) , quantum mechanics , membrane
A numerical inverse method was used to interpret simultaneously multirate injection and recovery data from single‐hole pneumatic tests in unsaturated fractured tuff at the Apache Leap Research Site near Superior, Arizona. Our model represents faithfully the three‐dimensional geometry of boreholes at the site, and accounts directly for their storage and conductance properties by treating them as high‐permeability and high‐porosity cylinders of finite length and radius. It solves the airflow equations in their original nonlinear form and yields information about air permeability, air‐filled porosity and dimensionless borehole storage coefficient. Some of this is difficult to accomplish with analytical type‐curves. Air permeability values obtained by our inverse method agree well with those obtained by steady‐state and type‐curve analyses.