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Estimation of Interstitial Velocity Using a Direct Drive High-Resolution Passive Profiler.

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A new high-resolution passive profiler (HRPP) estimates groundwater velocity using bromide tracer mass transfer. This method accurately measures interstitial velocity in heterogeneous aquifers, crucial for contaminant transport studies.

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Area of Science:

  • Environmental Science
  • Hydrogeology
  • Geochemistry

Background:

  • Groundwater velocity is critical for contaminant fate and transport.
  • Highly stratified aquifers exhibit significant velocity variations.
  • Accurate measurement of groundwater velocity at high resolution is needed.

Purpose of the Study:

  • To develop and validate a high-resolution passive profiler (HRPP) for estimating groundwater velocity.
  • To use bromide (Br-) mass transfer as a tracer for interstitial velocity.
  • To evaluate the HRPP's performance in heterogeneous aquifer conditions.

Main Methods:

  • Laboratory experiments using HRPP in flow boxes with varying soil porosities.
  • Measuring bromide mass transfer coefficient at different interstitial velocities (0-100 cm/day).
  • Employing a 2D quasi-steady-state model to relate velocity and mass transfer.

Main Results:

  • A direct, non-linear relationship was found between bromide mass transfer coefficient and velocity.
  • The mass transfer coefficient was determined within a single 3-week HRPP deployment.
  • Porosity, sampler orientation, and deployment duration had minimal effect on the mass transfer coefficient.

Conclusions:

  • The HRPP is a viable tool for estimating groundwater velocity in shallow heterogeneous aquifers.
  • The method shows potential for field application with a minimum depth resolution of 10 cm.
  • Accurate groundwater velocity data aids in predicting contaminant transport and fate.