Authors / CoAuthors
Unknown
Abstract
This use of this data should be carried out with the knowledge of the contained metadata and with reference to the associated report provided by Geoscience Australia with this data (Reforming Planning Processes Trial: Rockhampton 2050). A copy of this report is available from the the Geoscience Australia website (http://www.ga.gov.au/sales) or the Geoscience Australia sales office (sales@ga.gov.au, 1800 800 173). The wind hazard outputs are a series of rasters, one for each average recurrence interval considered, presenting peak wind hazard (peak from all directions) as measure in km/h. This file identifies the extent of inundation from sea-level rise combined with Highest Astronomical Tide (HAT) which is 3.9 m AHD. The name of the file indicates the scneraio water height, e.g. p3p9_LGAClip indicates the inundation shown is for 3.9 m above AHD and that the file has been clipped by the Local Government Area (LGA) to remove the offshore inundation identified.
Product Type
dataset
eCat Id
77371
Contact for the resource
Custodian
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Keywords
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- GIS Dataset
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2013-08-21T00:00:00
Creation Date
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Purpose
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Lineage
Below is an augmented extract of the method identified within the technical report. The sea-level rise analysis was completed through the addition of sea-level rise heights to the 2012 Highest Astronomical Tide (HAT: 3.9 m) value at Rockhampton. HAT is defined by the Australian Hydrographic Service as 'The highest level of water which can be predicted to occur under any combination of astronomical conditions' . The four sea level rise scenarios are: - + 0.3 m (QLD 2050) - + 0.5 m (QLD 2070) - + 0.8 m (QLD 2100) - + 1.1 m (FED 2100) The three Queensland scenarios (2050, 2070 and 2100) are identified within the Queensland Coastal Plan . The Federal scenario (+1.1 m by 2100) was identified by CSIRO from the Intergovernmental Panel on Climate Change's 4th Assessment Report and subsequent research . This 1.1 m scenario considers the 'high-end' risk including the effects of warming trends on ice sheet dynamics. Spatial analysis Utilising the high resolution, 1 m by 1 m raster, Digital Elevation Model (DEM) spatial queries were completed to identify bare earth elevation values that were equal to or less than the scenario value. In the example of the QLD 2050 scenario the elevation is identified where it is equal to or less than 4.2 m (3.9 m (HAT) + 0.3 m) above the Australian Height Datum (AHD). The extraction method, through several Python scripts, included: 1. Identify the peak water level and extract the tiles that contained this value or less than this value. All remaining inundation datasets were then extracted from this subset to save processing tiles that were not relevant. 2. Process each DEM tile dataset and extract the elevation cells equal to or less than the mean ARI storm tide height being considered from the relevant tile collection (as in point 1). 3. Convert the result of the query raster tiles to polygons 4. For each water height append all tiles together (now being polygons) The resulting extents were then clipped by the QLD LGA file, to remove offshore inundation. As the inundation extent is occurs over the period of the tidal cycle further inland inundation is expected as compared with a much faster moving event such as a tropical cyclone and the related storm tide. The SLR inundation extent may well be an overestimate and specifically where the inundation identified is isolated from the main body of water this is likely to be an artefact of the 'bath tub' method where all elevation values less than the scneario height are identified.
Parent Information
Extents
[-23.7194, -21.9598, 150.115, 151.0629]
Reference System
Spatial Resolution
Service Information
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