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A spreadsheet program for two-well tracer test data analysis.

Guoping Tang1, David B Watson, Jack C Parker

  • 1Environmental Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA. tangg@ornl.gov

Ground Water
|July 30, 2011
PubMed
Summary
This summary is machine-generated.

This study presents an approximate analytical solution for two-well tracer tests, simplifying subsurface solute transport analysis. The developed Excel tool aids in designing and analyzing tracer tests, offering a quicker alternative to complex numerical methods.

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Area of Science:

  • Hydrogeology
  • Environmental Engineering
  • Geochemistry

Background:

  • Two-well tracer tests are crucial for understanding subsurface solute transport.
  • Analyzing breakthrough curves is challenging due to complex flow conditions.
  • Existing numerical methods can be computationally intensive.

Purpose of the Study:

  • To extend approximate analytical solutions for the advection-dispersion equation.
  • To implement these solutions in Microsoft Excel using VBA for practical application.
  • To provide a tool for designing and analyzing two-well tracer tests.

Main Methods:

  • Developed approximate analytical solutions for an injection-extraction well doublet.
  • Implemented solutions in Excel VBA for step or pulse injections.
  • Compared analytical solutions with numerical integration for varying dispersivity.

Main Results:

  • The VBA tool accurately calculates concentrations in wells for different injection types.
  • Analytical and numerical results show good agreement for low dispersivity.
  • The analytical approach is faster, while numerical integration is more accurate for high dispersivity.

Conclusions:

  • The developed method offers a valuable first approximation for tracer test design and analysis.
  • The Excel tool can serve as a verification method for numerical solutions.
  • The code and example files are publicly available for broader use.