Want to know what the Vanuatu coastline may look like in 2100? Coastal Risk Vanuatu (CRV) has been opened for public consultation to show you what the Vanuatu coast may look like in 2100. It is an interactive map tool designed to communicate coastal inundation associated with sea level rise to the year 2100. Using Google Earth Engine technology, CRV allows you to investigate the extent of coastal inundation using the latest 3D models of the Vanuatu coastline. Data has been captured using airborne LiDAR technology to create detailed digital elevation models (DEMs), which are then combined with ‘bucket-fill’ inundation modelling to create the map-based visualisations. How It Works Inundation = Sea Level Rise Scenarios (Low, Medium and High) + High Tide The inundation height for each area is computed using the above calculation. The Port Vila tide gauge is used as the basis to generate the Highest Astronomical Tide inundation layers. The Mean Sea Level (MSL 2012) for the Port Vila Tide Gauge that has been used is 0.904m. The Highest Astronomical Tide level that has been used for current day is 1.63m, representing a level of 0.73m above Mean Sea Level (2012). Sea Level Rise Scenarios CRV allows users to investigate projected 2100 sea level rise scenarios for their locality. These scenarios are based on findings from the Intergovernmental Panel on Climate Change (IPCC) Fifth Assessment Report, and are expressed in terms of Representative Concentration Pathways (RCPs). The RCPs have become a standard way for discussing future emission scenarios. Below are three sea level rise scenarios which have been used in CRV. The values below have been obtained from the IPCC Fifth Assessment Report, Climate Change 2013: The Physical Science Basis, Chapter 13 Sea Level Rise, Table 13.5 Median Values and Likely Ranges for Projections of Global Mean Sea Level Rise. The low scenario considers sea level rise in the context of a global agreement which would bring about dramatic reductions in global emissions. This low scenario, termed RCP 2.6, has a median sea level rise of 0.44 metres by 2100. The medium scenario considers sea level rise where global emissions stabilise after 2100. This medium scenario aligns approximately to RCP 4.5 and RCP 6.0, which have median sea level rises of 0.53 metres and 0.55 metres respectively by 2100. In CRV we have combined these scenarios for simplicity, and used the mean value of 0.54 metres. The high scenario is in line with recent global emissions and observations of sea level rise. This high scenario aligns to RCP 8.5, which has a median sea level rise of 0.74 metres by 2100. Digital Elevation Models (DEMs) The DEMs are 3D models of the land which are used to compute the low-lying areas susceptible to inundation. The DEMs have been mapped in great detail using airborne LiDAR technology. The DEMs used in CRV have a resolution of 1m, or in other words, a height value for every 1m along the Vanuatu coast. To get access to the Vanuatu Coastal DEM or find out more about LiDAR technology go to Further Information under the Useful Links on CRV. Cyclone Pam UAV Imagery and Crowd-Sourced Photos In March 2015 tropical Cyclone Pam was one of the worst natural disasters to hit Vanuatu, with its sustained winds rating as one of the most intense tropical cyclones in the South Pacific Ocean. A previous version of Coastal Risk Vanuatu, the Cyclone Pam Crisis Map, was setup within days of the cyclone for the public to access first response imagery and maps. Two of the most valuable datasets following the response included the UAV imagery and social media photos. These two datasets have been included in Coastal Risk Vanuatu to show people how maps can be used to visualise post-disaster information. The UAV imagery has been provided by the Pacific Community . This aerial imagery was captured over townships around Vanuatu from early to mid-April 2015. The imagery was captured using a Trimble UX5 flown at 120m above ground. The level of detail captured by the UAVs was able to provide targeted post-disaster response. The social media photos were generated in cooperation with the Standby Taskforce . These photos were captured by locals in the days following the disaster, and provide a valuable ground level insight into the devastation.
It’s great that you're keen on seeing what the Vanuatu coast may look like in 2100. Here is some information on how to get the most out of Coastal Risk Vanuatu (CRV). This version has been opened for public consultation, therefore if you experience any issues, or wish to provide feedback please submit a comment using the feedback link provided. If you enjoy the experience, feel free to like us with Twitter or LinkedIn by clicking the icons in the top right of your screen. For more information on any of the terminology or concepts in this guide go to the Background section of CRV. Quick and Easy Click on one of the well-known places on the front page, accept the conditions of use and you're away. Pan and zoom to your places of interest to see the high tide flood extent for today (dark blue) and the high sea level rise scenario for 2100 (light blue). Type in a location in the top left Google Search once you're in the map and you can go to any coastal location around Vanuatu where there is data. Using the 2100 Sea Level Rise Scenarios provided by the IPCC In the top left corner of the map screen you can see the predicted scenarios. You are able to select either the high, medium or low sea level rise scenarios to look at how the 2100 high tide inundation changes with each scenario. Go to the Background section to read about the details of each scenario. These are based on the Intergovernmental Panel on Climate Change Fifth Assessment Report scenarios. Seeing More or Less Information You can click either of the two "Current Day Highest Tide" or "2100 | + X.XXm Highest Tide" buttons to turn off the flood extents. You can also go to the Layers panel on the left hand side to reveal the Flood, DEM, Aerial Photography, and Cyclone Pam UAV Photography layers. Click any of these to turn them on and off and to also adjust transparency. The Flood box turns on and off the flood extents. The DEM layer turns on and off the underlying data which shows the heights of the land. The DEM is used to calculate which are the low-lying areas that get flooded. The Cyclone PAM UAV photography has been provided by the Pacific Community (SPC) and captures some of the damage that was caused by Cyclone Pam in March 2015. The dot placemarks for this layer indicate where there is UAV imagery on Efate and Tanna. Manually Setting Your Inundation In the top left you can select either Predicted or Manual. Click on Manual and then use the slider to set the inundation level to whatever you like. The level you set will be the height above current day mean sea level.