Numerical inverse interpretation of single-hole pneumatic tests in unsaturated fractured tuff |
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Authors: | Vesselinov V V Neuman S P |
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Institution: | Department of Hydrology and Water Resources, University of Arizona, Tucson, AZ 85721-0011, USA. |
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Abstract: | 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. |
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