Port Phillip Bay Coastal Hazards Assessment (PPBCHA) Hydrodynamic and Wave Model

This dataset contains output from a 2D hydrodynamic and wave model (Semi-implicit Cross-scale Hydroscience Integrated System Model and Wind Wave Model III, SCHISM-WWMIII), configured over Port Phillip Bay including significant portions of the surrounding ocean and Bass Strait. \n\nThe model simulates water levels due to astronomical tides, weather, waves and aspects of wave-flow interaction over multiple decades, allowing for full consideration of the dynamics of extreme sea levels and waves within the Bay. Simulations were also carried out to assess changes in dynamics associated with various sea level rise scenarios: 0.2, 0.8 and 1.4m above historical mean sea level. \n\nThis collection contains:\n- A 35-year hindcast (1980 - 2014) \n- 2x 20-year simulations based on the period 1980-1999 with additional sea level imposed on the model boundary: 0.2m and 0.8m \n- 1x 35-year simulation based on the period 1980-2014 with additional sea level imposed on the model boundary of 1.4m\nto simulate the effects of possible future sea level increases. \n\nThe simulation of several decades of climate information was required to ensure that the hazard assessments were predicated on credible meteorological, hydrodynamic and climate information, at a scale capable of resolving most local coastal defences and associated infrastructure. \n\n\nLineage: Atmospheric forcing for the SCHISM-WWMIII model was obtained from a simulation of the CSIRO Conformal Cubic Atmospheric Model (CCAM). The CCAM model was run over Victoria over the 1980-2014 period with a resolution of 5 km as part of the DELWP-funded VCP19 project using the ERA-Interim global reanalysis as forcing. The surface pressure and 10 m winds from this simulation provided atmospheric forcing for the SCHISM-WWMIII model. \n\nOcean boundary water level forcing was obtained from a 4km resolution ROMS model covering Bass Strait, waves from a regional SWAN wave model, and tides from TPXO7.2.\n\nThe model was run on NCI's Raijin and Gadi supercomputers, with results combined and archived to CSIRO /datastore, while the final netCDFs were transferred to Bowen storage.