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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography

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Active thermal tracer tests for improved hydrostratigraphic characterization.

Andrew T Leaf¹, David J Hart, Jean M Bahr

¹Department of Geoscience, Universityof Wisconsin-Madison, Madison, WI 53706, USA. aleaf@geology.wisc.edu

|February 11, 2012

Summary

This summary is machine-generated.

This study introduces distributed temperature sensing (DTS) for borehole dilution testing, improving hydrogeologic characterization. DTS accurately maps subsurface flow and inflows, enhancing understanding of complex hydrostratigraphic units.

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Area of Science:

Hydrogeology
Environmental Science
Geophysics

Background:

Subsurface heterogeneity in hydraulic properties presents a significant challenge in hydrogeology.
Accurate characterization of hydrostratigraphic units is crucial for understanding groundwater flow.
Conventional borehole testing methods have limitations in speed, sensitivity, and disturbance.

Purpose of the Study:

To develop and validate an improved method for borehole dilution testing using distributed temperature sensing (DTS).
To enhance hydrostratigraphic characterization by monitoring advective heat movement.
To gain a detailed understanding of borehole flow regimes and inflow locations.

Main Methods:

Implemented distributed temperature sensing (DTS) for monitoring advective heat movement during borehole dilution tests.
Conducted open-well thermal dilution tests in multiaquifer wells.
Utilized DTS for synoptic temperature profiling without disturbing the fluid column.

Main Results:

DTS provided rapid (seconds) and sensitive measurements of advective heat movement.
Detailed information on borehole flow rates and inflow locations (fractures and porous media) was obtained.
Identified previously unrecognized flow complexities within a supposedly homogenous hydrostratigraphic unit.

Conclusions:

Distributed temperature sensing (DTS) offers significant advantages over conventional borehole flow logging technologies.
The improved DTS method enhances the characterization of subsurface hydraulic properties and processes.
This technique leads to a more nuanced understanding of groundwater flow in heterogeneous hydrogeologic settings.