Spatially Varying Tidal Plane Tsunami Hazard Model for Gladstone Region

A proposed tidal adjustment technique for tsunami hazard assessments in regions with spatially inhomogeneous tidal planes, such as northern Australia where Highest Astronomical Tide varies from 1.4 m to over 5.4 m. The method is demonstrated using the Gladstone region as a case study, comparing scenarios at different HAT levels and performing 'mini' probabilistic assessments at three sites. The research was presented at the 2025 Australasian Coasts & Ports Conference.

Use Cases

• Modeling tsunami inundation with spatially varying Highest Astronomical Tide levels based on the described tidal adjustment technique.
• Comparing tsunami scenarios at different tidal levels for sites like Lady Elliot Island, South Trees, and Rosslyn Bay.
• Performing probabilistic tsunami hazard assessments leveraging offshore scenarios and return periods from the 2018 Australian Probabilistic Tsunami Hazard Assessment.
• Supporting tsunami evacuation planning by producing inundation estimates derived from hydrodynamic models.

Strengths

• Method addresses spatial variation in Highest Astronomical Tide, which ranges from 1.4 m to over 5.4 m along Queensland's coast.
• Case study focuses on the Gladstone region with nested grid simulations down to 10 m resolution to resolve inundation.
• Technique does not require separate simulations at multiple tidal levels and avoids inducing spurious flows.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

Australian Ocean Data Network

Collection Method

Tsunamis simulated globally from earthquake source to Gladstone region using nested grids.

Freshness

Last updated 2026-05-05 05:13:53.195383; freshness should be verified.

Geography

Gladstone region and northern Australia, specifically Lady Elliot Island, South Trees, and Rosslyn Bay.