Hydraulic Performance of a Permeable Barrier Under Freeze-Thaw Cycling

42 freeze-thaw cycles were applied to duplicate laboratory Darcy boxes to assess impacts on a zero-valent iron and glass medium. The Australian Antarctic Data Centre collected measurements of bed heights, non-reactive tracer tests, and reactive kinetics with copper and zinc before, during, and after cycling. Data collection concluded in 2013.

Use Cases

• Modeling changes in hydraulic conductivity and residence time from bed height and tracer test data across 42 freeze-thaw cycles.
• Analyzing contaminant reaction kinetics using step-increase concentration data for copper and zinc solutions.
• Assessing media integrity and frost heave effects using measurements taken before, midway, and after the freeze-thaw simulation.
• Calibrating transport models with tracer recovery rates between 95% and 103% and electrical conductivity logs at 5-second intervals.

Strengths

• Experimental design includes 42 repeated freeze-thaw cycles, providing data on progressive degradation.
• Measurements were taken at three critical time points: before, midway, and after cycling, enabling trend analysis.
• Tracer tests showed high recovery rates (95-103%), indicating reliable hydraulic assessment methods.

Limitations

• Sample size is limited to two duplicate Darcy boxes, reducing statistical power.
• The dataset's temporal coverage ends in 2013, and its relevance to current field conditions is unknown.
• Specific column names, row counts, and data formats are not provided in the metadata.

Provenance

Source

Australian Antarctic Data Centre (AU_AADC) via NASA Earthdata.

Collection Method

Laboratory simulation using two custom-built Perspex Darcy boxes subjected to controlled freeze-thaw cycles, with peristaltic pumps for solution flow.

Time Range

Experimental period culminating in a metadata update on 2013-07-22.

Freshness

Last updated in 2013; no update frequency specified.

Geography

Laboratory-based simulation, with media and conditions designed for Antarctic remediation scenarios.