|
|
|
You are here: Home > GA Metadata
|
||||
|
GA Metadata Related Links |
Seabed exposure grid of Jervis BayNote: This metadata describes the dataset in accordance with the ANZLIC (Australia New Zealand Land Information Council) Core Metadata Guidelines Version 2. Dataset citationANZLIC unique identifier: ANZCW0703015199 Title: Seabed exposure grid of Jervis Bay CustodianCustodian: Geoscience Australia Jurisdiction: Australia DescriptionAbstract: Each of the ArcINFO grids is an output of a finescale hydrodynamic model, the Simulating WAves Nearshore (SWAN) model (Booij et al., 1999; Ris et al., 1999).The grids describe the modelled maximum orbital velocity (m/s) which can be used as estimation of seabed exposure in Jervis Bay ANZLIC search words:
Spatial domain:
Geographic extent name: AUSTRALIA EXCLUDING EXTERNAL TERRITORIES - AUS - Australia - Australia Geographic extent polygon: 150.6 -34.9, 151 -34.9, 151 -35.3, 150.6 -35.3, 150.6 -34.9, Note: The format for each Geographic extent name is: Name - Identifier - Category - Jurisdiction (as appropriate) See GEN Register
Data currencyBeginning date: 2010-10-20 Ending date: 2010-10-20 Dataset statusProgress: Complete Maintenance and update frequency: Not Known Access
Access constraints: This material is released under the Creative Commons Attribution 3.0 Australia Licence. Free Data DownloadData qualityLineage: A finescale hydrodynamic model, the Simulating WAves Nearshore (SWAN) model (Booij et al., 1999; Ris et al., 1999), was developed to estimate seabed disturbance for Jervis Bay. The SWAN model estimates wave propagation using the wave action equation (Hasselmann et al., 1973). The model takes into account refraction of swell waves, plus shoaling, diffraction, dissipation and random waves, but excludes local wave generation by wind. The bathymetry data for the SWAN model was input at 100metre spatial resolution. The model also required three parameters: significant wave height (2 to 4 metres), peak wave period (6 to 12 seconds), and peak wave direction (?p, 90 or 160 degree). The model generated five variables (in a plain text file) for each scenario: significant wave height, wave direction, orbital velocity, orbital diameter and maximum orbital velocity. The maximum orbital velocity (unit: m/s) was considered as the best estimate of seabed exposure. The values of maximum orbital velocity were then combined to generate three seabed exposure variables: averaging all 12 scenarios (jb_all_av), averaging eight scenarios with ?p = 160 (jb_90_av; from southeast), and averaging four scenarios with ?p = 90 (jb_90_av; from east). These three seabed exposure variables were then transformed intoArcINFO grids Positional accuracy: The positional accuracy is largely depended on the input bathymetry grid. Because the bathymetry grid is at 100 metre resolution, the positional accuracy is estimated as 5 metres Attribute accuracy: This is a modelling output. SWAN model has been considered as a good finescale hydrodynamic model suitable for Jervis Bay. The attribute accuracy is thus estimated as moderate to high Logical Consistency: The modelling processes and the transforming steps used to generate the grids are consistent Completeness: Complete Contact information
Metadata informationMetadata date: 2013-03-08 Additional metadataMetadata reference XHTML: http://www.ga.gov.au/meta/ANZCW0703015199.html Metadata reference XML: http://www.ga.gov.au/meta/ANZCW0703015199.xml . Authors:Geoscience Australia |
|||
|
SPATIAL INFORMATION FOR THE NATION
|