Numerical inverse interpretation of single-hole pneumatic tests in unsaturated fractured tuff.
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.
Vesselinov
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Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ 85721-0011, USA.
Neuman
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SP
D000388:Air; D055593:Geological Phenomena; D005844:Geology; D008962:Models, Theoretical; D010539:Permeability; D016062:Porosity; D012987:Soil; D014872:Water Movements
D012987:Soil