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. While the variations of tidal range are large and fairlywell known across Australia (less than 1 m near Perth but more than 14 m inKing Sound), the properties of the tidal currents are not. We describe a newregional model of Australian tides and assess it against a validationdataset comprising tidal height and velocity constituents at 615 tide gaugesites and 95 current meter sites. The model is a barotropic implementationof COMPAS, an unstructured-grid primitive-equation model that is forced atthe open boundaries by TPXO9v1. The mean absolute error (MAE)of the modelled M2 height amplitude is 8.8 cm, or 12 % of the 73 cm meanobserved amplitude. The MAE of phase (10∘), however, issignificant, so the M2 mean magnitude of vector error (MMVE, 18.2 cm) issignificantly greater. The root sum square over the eight major constituents is26 % of the observed amplitude. We conclude that while the model has skillat height in all regions, there is definitely room for improvement(especially at some specific locations). For the M2 major axis velocityamplitude, the MAE across the 95 current meter sites, where the observedamplitude ranges from 0.1 to 156 cm s−1, is 6.9 cm s−1, or 22 % of the 31.7 cm s−1 observed mean. This nationwideaverage result is encouraging, but it conceals a very large regionalvariation. Relative errors of the tidal current amplitudes on the narrowshelves of New South Wales (NSW) and Western Australia exceed 100 %, but tidal currents areweak and negligible there compared to non-tidal currents, so the tidalerrors are of little practical significance. Looking nationwide, we showthat the model has predictive value for much of the 79 % of Australia'sshelf seas where tides are a major component of the total velocityvariability. In descending order this includes the Bass Strait, the Kimberley toArnhem Land, and southern Great Barrier Reef regions. There is limitedobservational evidence to confirm that the model is also valuable forcurrents in other regions across northern Australia. We plan to commencepublishing “unofficial” tidal current predictions for chosen regions in thenear future based on both our COMPAS model and the validation dataset wehave assembled.

Australian tidal currents – assessment of a barotropic model (COMPAS v1.3.0 rev6631) with an unstructured grid