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S PAT I A L LY E N A B L I N G A U S T R A L I A & N E W Z E A L A N D PROJECT 9.06 | VISTOOL - SEA LEVEL RISE AND COASTAL FLOODING VISUALISATION TOOL Project Leader Research Team P Tickle, CRC for Spatial Information, [email protected] J Keysers, CRC for Spatial Information, [email protected] Project Participants NGIS, Australian Dept of the Environment; Geoscience Australia, ACE CRC, State and Local Government agencies Background With around 85% of Australia's population living in the coastal zone, understanding the future risks to infrastructure and property is particularly important to ensure our towns and cities are positioned to adapt to the changes we are likely to experience. Many of the risks from climate change can be managed if we plan ahead. Communities and decision-makers need early access to information and data to help understand the potential impacts and manage the risks. Over the 20th century, the rate of sea level rise globally was about 1.7 mm per year. Since 1993, the rate of sea level rise has been around 3.2mm per year and scientists estimate that sea levels could rise by up to a meter or more by the end of this century. Outcomes Ÿ Providing non-specialist users with direct access to products derived from over 80,000sqkm of LiDAR data Ÿ Increasing awareness across all levels of government, business and the community of the potential impacts of sea level rise Ÿ Demonstrating the benefits of ensuring decision-makers, investors and the community have access to the best available information Ÿ A simple tool for analysing, visualising and communicating the risks associated with sea level rise and coastal flooding to assist future planning and management The VisTool The VisTool allows users to investigate the extent and depth of coastal flooding under different climate change scenarios using high resolution digital elevation models derived from airborne LiDAR, and a ‘bucket-fill’ inundation modeling approach. Modelling Contributions to coastal sea level rise from tides, storm surge and wave processes. Users can investigate sea level rise, tidal heights and seasonal storm surge up to a combined total of 10 metres for available locations. This enables users to investigate nearer term changes, such as low sea level rise scenarios for 2030, or rarer longer term scenarios, such as the combined effects of long term sea level rise combined with a 1 in 250 year seasonal storm surge event. Users can also explore their own scenarios based on local knowledge. www.vistool.com.au Using the VisTool Users can select an inundation scenario based on the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (2007) and more recent science, or build their own scenarios. The Vistool also has the unique ability to account for local variations in tides through incorporation of a “Virtual Tide Gauge” model developed by the CRC for Antarctic Climate and Ecosystems (ACE CRC). The Vistool does a local tidal adjustment based on the virtual tide gauges within the map screen. Modelling ‘Bucket-fill’ inundation modelling approach. Flood Extent Scenario Potential coastal flooding around Brisbane, showing inundation flood extent associated with a sea level rise of 0.45 meters, high (A1Fl) scenario for 2070, combined with highest astronomical tide. VisTool Overview Image shows the extent of data currently loaded. VisTool is built on the Google Map Engine Platform which stores the data on the Google Cloud. Inundation Depth Scenario Potential coastal flooding around Melbourne, showing inundation depth associated with a sea level rise of 1.1 meter, combined with a highest astronomical tide. Limitations VisTool is intended to provide an initial assessment of the risk of sea level rise and storm surge to the coastal zone. The inundation products are based on a simple modelling approach and should be considered as approximate only. The actual impacts may vary as this model does not take account of existing sea walls, erosion or other local factors such as ocean currents, and does not include consideration of any future protective action that may be taken. Map Production Users can produce custom PDF maps on demand 3D Visualisation Inundation layers are available as Web Map Services for display in Google Earth or other platforms