Spatially Varying Tidal Plane Models for Tsunami Hazard Assessment in Gladstone Region

Australian Ocean Data Network presents a technique for tsunami hazard assessment accommodating spatially varying Highest Astronomical Tide (HAT). The method is demonstrated using the Gladstone region as a case study, comparing scenarios at different HAT levels at sites like Lady Elliot Island, South Trees, and Rosslyn Bay. The work uses nested grids with resolution down to 10 meters and considers four major earthquake source zones, presented at the 2025 Australasian Coasts & Ports Conference.

Use Cases

• Refining tsunami evacuation plans based on spatially inhomogeneous tidal plane modeling
• Comparing inundation estimates from hydrodynamic models against current heuristic methods
• Assessing marine hazards using nested grids with 10-meter resolution
• Evaluating probabilistic tsunami hazard from major earthquake source zones using importance sampling

Strengths

• Method addresses HAT variation from 1.4 m at Lady Elliot Island to over 5.4 m near St Lawrence
• Case study uses nested grids with resolution down to 10 meters to resolve inundation
• Technique does not require separate simulations at multiple tidal levels

Limitations

• Column-level documentation is absent; field semantics must be inferred after download
• Row count is unknown, which may limit suitability assessment
• Data may reflect geographic bias inherent to data_gov_au, focusing on northern Australia

Provenance

Source

Australian Ocean Data Network

Collection Method

Tsunami simulations from earthquake source to Gladstone region using nested grids

Freshness

Last updated 2026-04-16 14:54:40.645615; freshness should be verified

Geography

Gladstone region, Queensland coast, northern Australia (Lady Elliot Island, South Trees, Rosslyn Bay)