Spatially Varying Tidal Planes for Tsunami Hazard Assessment in Gladstone, Australia

A proposed tidal adjustment technique addresses the spatial variation of the Highest Astronomical Tide (HAT), which ranges from 1.4 m at Lady Elliot Island to over 5.4 m near St Lawrence in Queensland. The method, presented at the 2025 Australasian Coasts & Ports Conference, is demonstrated using tsunami simulations for the Gladstone region with nested grids down to 10 m resolution. This dataset from Geoscience Australia supports refining evacuation plans by producing more accurate inundation estimates than non-hydrodynamic heuristics.

Use Cases

• Calibrating tsunami inundation models based on spatially varying tidal planes mentioned in the description
• Conducting probabilistic tsunami hazard assessments based on the four major earthquake source zones referenced
• Comparing tsunami scenarios at different HAT levels for sites like Lady Elliot Island, South Trees, and Rosslyn Bay
• Refining marine and onshore evacuation procedures based on hydrodynamic model outputs

Strengths

• Method validated for a specific case study region (Gladstone) with markedly different HAT levels at three sites.
• Uses nested simulation grids with resolution down to 10 meters 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.
• Data is presented in a PDF format, which may require extraction for computational analysis.
• The spatial coverage is focused on the Gladstone region and three specific sites in Queensland.

Provenance

Source

Geoscience Australia Data

Collection Method

Proposed technique using nested tsunami simulation grids and importance sampling from prior hazard assessments.

Freshness

Last updated 2026-04-20 02:43:28.736620; freshness should be verified.

Geography

Gladstone region, Queensland, Australia (specifically Lady Elliot Island, South Trees, and Rosslyn Bay)