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Related Experiment Videos

Interpreting velocities from heat-based flow sensors by numerical simulation.

Grace W Su1, Barry M Freifeld, Curtis M Oldenburg

  • 1Earth Sciences Division, Lawrence Berkeley National Laboratory, University of California, Berkeley, 94720, USA. gwsu@lbl.gob

Ground Water
|May 10, 2006
PubMed
Summary

Formation heterogeneities can create false downward flow readings in heat-based flow sensors. Numerical simulations reveal that changes in thermal conductivity near the probe can mislead groundwater velocity interpretation.

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Area of Science:

  • Geosciences
  • Hydrogeology
  • Environmental Science

Background:

  • In situ heat-based flow sensors estimate groundwater velocity by analyzing temperature changes around a heated probe.
  • Standard interpretation methods assume homogeneous formation properties, which may not reflect real-world conditions.
  • Unexpected downward flow components were observed using these sensors near a clay aquitard.

Purpose of the Study:

  • To investigate the impact of formation heterogeneities on groundwater flow velocity interpretation using heat-based sensors.
  • To determine if variations in thermal conductivity can cause erroneous vertical flow indications.
  • To assess the reliability of standard interpretive methods in heterogeneous subsurface environments.

Main Methods:

  • Numerical simulations of three-dimensional nonisothermal flow around a cylindrical heat-based flow sensor.

Related Experiment Videos

  • Modeling the sensor's response to variations in formation thermal conductivity.
  • Comparing simulated temperature profiles with those expected under homogeneous conditions.

    • Main Results:

    • Decreased thermal conductivity near the sensor's bottom can significantly perturb temperature profiles.
    • Such perturbations can lead to the spurious detection of vertical groundwater flow, even when flow is horizontal.
    • The standard interpretive method, assuming homogeneous thermal conductivity, is susceptible to these errors.

    Conclusions:

    • Formation heterogeneity, specifically variations in thermal conductivity, can critically affect the accuracy of heat-based flow sensor data.
    • Caution is advised when interpreting groundwater flow velocities from these instruments, particularly in layered or heterogeneous formations.
    • Numerical modeling is a valuable tool for understanding instrument response and identifying potential sources of error in subsurface measurements.