Spatially Varying Tidal Planes for Tsunami Hazard Assessment in Gladstone Region

A method and case study for accommodating spatially varying highest astronomical tide levels in tsunami hazard assessments. The technique is demonstrated using the Gladstone region of Queensland, Australia, with comparisons at three sites: Lady Elliot Island, South Trees, and Rosslyn Bay. The work was presented at the 2025 Australasian Coasts & Ports Conference and published by Geoscience Australia Data.

Use Cases

• Refining tsunami evacuation procedures based on spatially varying tidal planes mentioned in the description
• Conducting probabilistic tsunami hazard assessments leveraging the four major earthquake source zones described
• Modeling tsunami inundation with a 10 m resolution grid to resolve marine hazards as detailed in the method
• Comparing hazard results from the proposed technique against heuristics not derived from hydrodynamic models

Strengths

• Method validated with specific HAT level comparisons at three sites: Lady Elliot Island (1.4 m), South Trees, and Rosslyn Bay (over 5.4 m near St Lawrence)
• Uses nested grids with resolution down to 10 m to resolve inundation
• Leverages scenarios and return periods from the 2018 Australian Probabilistic Tsunami Hazard Assessment

Limitations

• Column-level documentation is absent; field semantics must be inferred after download
• Row count is unknown, which may limit suitability assessment
• Data is presented in PDF format, which may require extraction for computational analysis

Provenance

Source

Geoscience Australia Data

Collection Method

Proposed tidal adjustment technique demonstrated via tsunami simulations using nested grids and importance sampling from the 2018 Australian Probabilistic Tsunami Hazard Assessment.

Freshness

Last updated 2026-03-25 18:49:11.619343

Geography

Gladstone region, Queensland, Australia, with specific sites at Lady Elliot Island, South Trees, and Rosslyn Bay.