https://ogma.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39957 th percentile of the maximum wave amplitudes (over time) of the relevant T2 scenario within each coastal zone (P95). Threshold values for P95 have previously been derived through analysis of observed impacts for recent events. Given that historical records are available for only a short time period and no observations exist for which a Land Threat would have been issued for Australia, it has been difficult to determine the appropriate threshold for a Land Threat. Several recent tsunami hazard assessment studies have used inundation models nested within T2 scenarios. These modelling results are used to evaluate the threshold values for JATWC tsunami warnings and provide guidance on a possible further warning tier - Major Land Threat. The optimum Land Threat threshold for P95 is found to be 48.5cm, however, it is not recommended that any changes are made from the existing operational threshold of 55cm. The optimum threshold for P95 a Major Land Threat is found to be 150.5 cm.]]> Tue 04 Oct 2022 15:13:11 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39858 Thu 21 Jul 2022 09:34:26 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35909 2 m/s), wave amplification and rapid changes in water level. Significant land inundation only occurs for scenarios modelled with the largest waves (9.0 M_W source). The degree of exposure to the open ocean and the geomorphology of locations within the Harbour determine the relative level of these impacts. Narrow, shallow channels, even those sheltered from the open ocean, create a bottleneck effect and experience the highest relative current speeds as well as elevated water levels. The largest maximum water levels (>8 m) occur in exposed, funnel-shaped bays and wave amplification is greatest at locations exposed to the open ocean: >7 times deep water wave heights for 9.0 M_W source waves. Upstream attenuation rates of runup and maximum water level show a linear correlation with wave height parameters at the 100 m depth contour and may provide some predictive capabilities for potential tsunami impacts at analogous locations. In the event of a tsunami in Sydney Harbour, impacts may threaten marine traffic and infrastructure.]]> Thu 16 Jan 2020 13:25:09 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41139 Mon 23 Jan 2023 11:40:30 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46112 Mon 23 Jan 2023 09:12:02 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41305 Mon 01 Aug 2022 12:23:44 AEST ]]>