Bio-irrigation Rates in Port Phillip Bay Sediments from Tracer Experiments

Deuterium tracer experiments in seven benthic chambers across four sites in Port Phillip Bay model bio-irrigation rates. Modelling indicates advection of overlying water occurs at depths of 20-50 cm below the sediment-water interface and at rates between 150 and 700 mL h-1. The data, from Geoscience Australia, shows irrigation rates vary by region within the bay, influencing how quickly the entire water column passes through the sediments.

Use Cases

• Modeling pore-water solute transport based on deuterium tracer decay curves
• Comparing bio-irrigation rates across different sediment types and depths in a bay
• Estimating whole-bay water turnover through sediments based on measured advection rates
• Calibrating models of infauna distribution using regionally consistent irrigation measurements

Strengths

• Data from seven incubation chambers deployed at four distinct sites provides spatial replication
• Modelling provides concrete depth (20-50 cm) and rate (150-700 mL h-1) estimates for bio-irrigation
• Multiple chambers in the same region showed consistent results, suggesting reliable measurement

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download
• Column-level documentation is absent; field semantics must be inferred after download
• The use of dissolved caesium as a tracer is noted to increase model uncertainty due to sediment adsorption

Provenance

Source

Geoscience Australia Data

Collection Method

Benthic incubation chamber experiments using deuterium and dissolved caesium tracers.

Freshness

Last updated 2026-05-14 04:32:38.648000; freshness should be verified

Geography

Port Phillip Bay, Australia