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Characterization of a multilayer aquifer using open well dilution tests.
L Jared West1, Noelle E Odling
1Institute of Earth and Biosphere, School of Earth Sciences, University of Leeds, Leeds LS2 9JT, UK. Jared@earth.leeds.ac.uk
Ground Water
|January 30, 2007
Summary
Characterizing multilayer aquifers is now easier with a novel borehole dilution method. This technique uses saline tracers to measure flow velocities, revealing aquifer properties more effectively than traditional methods.
Area of Science:
- Hydrogeology
- Environmental Science
- Geophysics
Background:
- Multilayer aquifer systems present challenges for accurate hydraulic property characterization.
- Traditional methods like straddle packers or screened wells are often costly and require prior knowledge of aquifer structure.
Purpose of the Study:
- To present a novel approach for characterizing multilayer aquifer systems using open well borehole dilution.
- To enable cost-effective and detailed assessment of aquifer hydraulic properties.
Main Methods:
- Introducing a saline tracer into observation wells during nearby extraction well pumping.
- Measuring tracer dilution versus depth profiles to identify permeable layers.
- Converting dilution profiles to vertical borehole flow velocities using an analytic solution to the advection-dispersion equation.
- Matching observed flow velocities with a hydraulic model to determine layer properties.
Main Results:
- The tracer dilution method successfully identified discrete permeable layers within the aquifer.
- Vertical borehole flow velocities were accurately determined, even for low flow conditions undetectable by flowmeters.
- Hydraulic properties of individual aquifer layers were successfully derived.
Conclusions:
- The described tracer dilution approach offers a cost-effective alternative to traditional pumping tests for multilayer aquifer characterization.
- This method enhances the ability to characterize larger aquifer volumes by enabling greater well separations.
- The approach is applicable to various multilayer aquifer systems, as demonstrated in a Chalk Aquifer example.
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