Data product | Project Tropical Cyclone Hazard Assessment (TCHA)
Defining the severe wind hazard threat posed to Australia
The TCHA provides an evaluation of the likelihood and intensity of the occurrence of tropical cyclone winds across the Australian region, covering mainland Australia, islands and adjacent waters.
Who is the TCHA for?
The TCHA provides vital information to emergency managers, town planners, infrastructure owners, and the insurance industry. It identifies local and regional areas that are at high threat to cyclones and severe wind.
It is also a key data source used in the development of local cyclone impact models. These are then used to inform disaster management and evacuation plans, infrastructure planning reports and mitigation strategies.
How the TCHA works
It uses Australian observations and data to determine how quickly tropical cyclones dissipate after landfall.
It uses the latest scientific methods to create realistically sized simulated tropical cyclones, analysing both intensity and latitude leads to more authentic modelling of a cyclone’s size over its lifetime.
It records precise details of each simulated tropical cyclone, including wind speeds and their locations around Australia, and the likelihood of extreme wind speeds, and records them in its event database.
It allows users to extract and examine individual tropical cyclone events, because it stores the wind field from each separate simulated tropical cyclone scenario.
Its event database allows users to separate hazard information into parts, so they can easily explore scenarios which may be relevant to their own communities.
Good to know
TCHA relates to tropical cyclone winds only. It doesn’t include other severe wind hazards, such as tornadoes, severe storms or cyclones that become storm events. Although this is standard practice for tropical cyclone hazard assessments and recognised internationally as an agreed methodology, it’s a key constraint and one the scientific community is addressing with research.
Geoscience Australia continues to update the TCHA, generally every four years.
The field of science and technology is constantly evolving and improving, and it’s important to incorporate best practice and evidence-based science in our knowledge. TCHA strives to reflect these advancements so Australian communities are as safe as possible from tropical cyclone events.
It’s likely that TCHA will be considered in future revisions to the Australian Standards on wind loading. This will ensure buildings and infrastructure in Australia are built to withstand tropical cyclone events.
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