Predicted Seabed Mud Content Grid for Darwin Harbour

A 2011-2017 compilation of survey data provides a spatially continuous prediction of seabed mud content for the Darwin and Bynoe Harbour region. The grid was created by Geoscience Australia, the Australian Institute of Marine Science, and the Northern Territory Government's Department of Environment and Natural Resources. It presents predictions in 10-meter resolution raster grids and ASCII text format.

Use Cases

• Modeling benthic habitat distribution by correlating predicted %mud content with other seabed characteristics.
• Assessing sediment transport and deposition patterns using the 10-meter resolution mud content grid.
• Validating and improving sediment prediction algorithms by comparing the model's VEcv accuracy of 62% against other methods.
• Creating baseline maps for environmental impact assessments by integrating the mud content layer with bathymetry and backscatter variables.

Strengths

• Predictive accuracy is very high, with a VEcv of 62% for mud, representing a 198.3% improvement over a commonly used method.
• Predictions are based on 395 physical samples and nine environmental variables derived from high-resolution multibeam sonar data.
• Data provides spatially continuous coverage for the greater Darwin Harbour region at a 10-meter resolution.

Limitations

• Absences in predictions occur due to non-availability of associated predictive variables in some areas.
• The sample size of 395 ground-truth observations may limit model granularity for a large geographic area.

Provenance

Source

Geoscience Australia (GA), Australian Institute of Marine Science (AIMS), Northern Territory Government Department of Environment and Natural Resources (NTG-DENR).

Collection Method

Predictions derived from a compilation of multiple seabed surveys (GA0333, GA0341, GA0351, GA4452, GA0356, GA0358, GA0359) using nine environmental variables from multibeam sonar.

Time Range

2011 to 2017

Freshness

Dataset supersedes previous predictions, with underlying surveys conducted between 2011 and 2017.

Geography

Greater Darwin Harbour and Bynoe Harbour region, northern Australian marine margin.