Australia: Department of Planning/Department of Transport, Australia, have delivered the first outputs of the project to assess coastal vulnerability and prepare for possible sea level rise. They include complete and seamless data files of water depths and broad seabed imagery from pseudo-reflectance and a high resolution coastal 3D model of the land and seabed between Two Rocks and Cape Naturaliste.
The data was collected by performing a LiDAR hydrographic survey. Some of the specific outputs delivered are ASCII xyz bathymetry data, digital elevation model, geo-referenced digital aerial mosaic imagery, tide data, surface images of the bathymetry data at 10 metre resolution, relative reflectance data, seabed data classified into seven classes, sun illuminated imagery, bathymetry plots and geo-referenced surface images of the bathymetry data.
The data collected will be used as input for several other purposes, such as:
– providing a baseline for undertaking continuous studies to assess the vulnerability of the built environment on the Perth metropolitan and south-west coastal strip;
– identification of coastal sediment cells in which areas functioning as sediment source areas, transport pathways and sediment sinks (areas of sediment loss from the coastal system) are determined;
– modelling flooding, groundwater, surface water, tsunamis and storm events;
– informing the development of regional and local coastal plans;
– assessment of the impacts of climate change induced sea level rise on the coast;
– identification of areas potentially at risk from storm surge, inundation, erosion and high winds;
– identifying areas yet to be developed where land use planning changes will be required;
– provide a basis for contingency planning and managing natural disasters;
– planning and managing urban development along the coastal plain – used by developers, consultants, local government authorities and state government agencies;
– preparing marine plans.
The data was collected by Tenix LADS (Laser Airborne Depth Sounding) Corporation Pty Ltd (now Fugro LADS Corporation Pty Ltd) on behalf of the departments.
The company was commissioned to collect bathymetric data and determine seabed texture for the area of coastline between Two Rocks and Cape Naturaliste. The study area extended seaward from the waterline at the coast to the nominal -20 metre marine nautical navigation chart contour (minus 21m AHD), and included seven selected shoals.
Source: Planning Western Australia