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Measurements of Soil Water Potential and Conductivity based on a Simple Evaporation Experiment using a Hydraulic Property Analyzer
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Characterizing a faulted aquifer by field testing and numerical simulation.

D M Allen1, F A Michel

  • 1Department of Earth Sciences, Simon Fraser University, Vancouver, British Columbia, V5A 1S6 Canada. dallen@sfu.ca

Ground Water
|January 8, 2009
PubMed
Summary

Interpreting hydraulic test data in faulted aquifers is complex. Numerical simulations revealed hidden hydraulic barriers that alter test curves, leading to inaccurate parameter estimates without transient analysis.

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Area of Science:

  • Hydrogeology
  • Geotechnical Engineering
  • Environmental Science

Background:

  • Faulted aquifers present unique challenges in hydraulic testing due to faults acting as both transmissive zones and barriers.
  • Previous analyses of a fractured carbonate aquifer suggested a linear-radial flow regime, but direct parameter input into numerical models yielded poor calibration.

Purpose of the Study:

  • To investigate the impact of hydraulic barriers within faulted aquifers on hydraulic test data interpretation.
  • To demonstrate the necessity of transient simulations for accurate parameter estimation and numerical model calibration in complex aquifer systems.

Main Methods:

  • Analysis of constant discharge test data using both radial and linear flow models.
  • Development and application of a numerical simulation approach for parameter estimation.
  • Comparison of hydraulic parameters derived from direct test data analysis versus numerical simulation.

Main Results:

  • Hydraulic parameters directly from test data were inappropriate for numerical modeling.
  • Numerical simulations identified significant hydraulic barriers associated with faults, which were not evident in early to mid-time test data.
  • These barriers caused modifications to hydraulic test curves, leading to incorrect parameter estimations.

Conclusions:

  • Faulted aquifer interpretation requires advanced methods beyond simple flow models.
  • Transient simulations are crucial for accurate model calibration and understanding the influence of subtle hydraulic barriers.
  • Numerical modeling provides a more robust approach to characterizing complex faulted aquifer systems.