Bio-irrigation Rate Models from Port Phillip Bay Sediments

Deuterium tracer experiments in seven benthic chambers across four sites measured non-diffusive solute transport, revealing bio-irrigation depths of 20-50 cm and rates from 150 to 700 mL h-1. The Australian Ocean Data Network published this study, which found irrigation rates vary significantly between different bay regions. The dataset was last updated in April 2026.

Use Cases

• Model bio-irrigation rate (mL h-1) from sediment type and site location data.
• Analyze correlation between tracer (deuterium, caesium) adsorption and model uncertainty across chambers.
• Compare irrigation depth (20-50 cm) and consistency across multiple chambers within the same bay region.
• Estimate whole-bay water column turnover time (e.g., 200 days) using lower pore-water advection rates.

Strengths

• Data from seven distinct benthic incubation chambers provides replication.
• Experiments conducted at four different sites within Port Phillip Bay allow for spatial comparison.
• Model outputs include concrete metrics: irrigation depths (20-50 cm) and rates (150-700 mL h-1).

Limitations

• Sample size is limited to seven chambers, restricting statistical power for broader generalization.
• Use of dissolved caesium tracer introduces uncertainty due to adsorption onto sediment particles.
• Specific row count, column details, and raw measurement data are unavailable from the description.

Provenance

Source

Australian Ocean Data Network via data.gov.au.

Collection Method

Deuterium-enriched tracer introduced to benthic incubation chambers emplaced on the sea floor; subsequent modeling of tracer concentration over incubation time.

Freshness

Last updated in April 2026.

Geography

Port Phillip Bay, Australia, with measurements from multiple regions within the bay.