Seabed Exposure and Ecological Disturbance Index for Australia's Continental Shelf

Australia's continental shelf environment is analyzed for seabed physical disturbance from waves and currents. Models predict the spatial distribution of an ecological disturbance index (ED) based on sediment mobilization and succession rates. The work was conducted by the Australian Ocean Data Network, with metadata updated in April 2026.

Use Cases

• Model the frequency and magnitude of seabed sediment mobilisation using wave, tide, and tropical cyclone energy sources.
• Predict the spatial distribution of the dimensionless ecological disturbance index (ED) for gravel, sand, and mud substrates.
• Identify high-energy, patch-clearing disturbance events exceeding a Shields parameter value of 0.25.
• Analyze areas where disturbance recurrence intervals are comparable to rates of ecological succession.

Strengths

• First continental shelf-wide analysis of this type attempted globally.
• Models distinguish between wave-dominated, tide-dominated, and tropical cyclone-dominated shelf regimes.
• Derived maps provide a spatial prediction of an ecological disturbance index.

Limitations

• Analysis addresses only physical seabed disturbance, excluding biological, temperature, salinity, and anthropogenic factors.
• Disturbance regime as defined applies to only an estimated 10% of the shelf area.
• Underlying sample data, row counts, and specific model validation metrics are unavailable.

Provenance

Source

Australian Ocean Data Network.

Collection Method

Models of seabed sediment mobilisation applied to examine the intermediate disturbance hypothesis.

Freshness

Metadata indicates an update in April 2026.

Geography

Australia's continental shelf.