Authors / CoAuthors
Siwabessy, J. | Picard, K.
Abstract
This resource contains backscatter data for the the Leveque Shelf, a sub-basin of the Browse Basin, in May 2013 on RV Solander (survey GA0340/SOL5754). The survey used a Kongsberg EM3002 300 kHz multibeam sonar system mounted in single head configuration to map six areas, covering a combined area of 1070 square kilometres. Data are gridded to 2 m spatial resolution. This survey provides seabed and shallow geological information to support an assessment of the CO2 storage potential of the Browse sedimentary basin. The basin, located on the Northwest Shelf, Western Australia, was previously identified by the Carbon Storage Taskforce (2009) as potentially suitable for CO2 storage. The survey was undertaken under the Australian Government's National CO2 Infrastructure Plan (NCIP) to help identify sites suitable for the long term storage of CO2 within reasonable distances of major sources of CO2 emissions. The principal aim of the Leveque Shelf marine survey was to look for evidence of any past or current gas or fluid seepage at the seabed, and to determine whether these features are related to structures (e.g. faults) in the Leveque Shelf area that may extend to the seabed. The survey also mapped seabed habitats and biota to provide information on communities and biophysical features that may be associated with seepage. This research, combined with deeper geological studies undertaken concurrently, addresses key questions on the potential for containment of CO2 in the basin's proposed CO2 storage unit, i.e. the basal sedimentary section (Late Jurassic and Early Cretaceous), and the regional integrity of the Jamieson Formation (the seal unit overlying the main reservoir)
Product Type
dataset
eCat Id
79033
Contact for the resource
Owner
Custodian
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Point of contact
- Contact instructions
- Place and Communities
Digital Object Identifier
Keywords
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- Marine DataBackscatter Grid
- ( Theme )
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- backscatter
- ( Theme )
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- multibeam
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- marine environmental baselines
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- marine survey
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- seabed
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- marine
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- AU-WA
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Marine Geoscience
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- Published_External
Publication Date
2014-01-01T00:00:00
Creation Date
Security Constraints
Legal Constraints
Status
Purpose
Maintenance Information
asNeeded
Topic Category
oceans
Series Information
Lineage
The backscatter data were processed using CMST-GA MB Process v12.05.07.0 (x64) toolbox software. The fully processed backscatter strengths were corrected for transmission loss and insonification area. The process within the toolbox also involved removal of the system transmission loss, removal of the system model, calculation of the incidence angle and removal of the angular dependence. The grid values are basically the average values of the processed backscatter point data within each grid cell of predefined size, normalised to the backscatter strength at an angle of 25 degrees
Parent Information
Extents
[-16.1, -15.45, 121.1, 121.75]
Reference System
Spatial Resolution
Service Information
Associations
Downloads and Links
Source Information
Processing software: CMST-GA MB Process v12.05.07.0 (x64) Survey Name: Oceanic Shoals Marine Surveys GA-0340/SOL5754 Vessel: RV Solander Country: Australia Operator: AIMS Bathymetric system used: Kongsberg EM3002 Year of installation: 2012 Nominal sonar frequency: 300 kHz Number of beams: 160 beams Beamwidth across track: 1.5 degrees Beamwidth along track : 1.5 degrees Pulse length: Variable, operator selectable Depth range: 45 - 105 m Vessel speed: 8 - 10 knots Start date of survey: 01 May 2012 End date of survey: 31 May 2012 Institution: Geoscience Australia Start port: Broome End port: Broome Survey leaders: Riko Hashimoto, Tanya Whiteway Data acquired and processed by: Justy Siwabessy, Kim Picard, Ian Atkinson, Steve Hodgkin Grids resolution: 2m Number of grids: 6 This dataset consists of the following files: - Georeferenced colour tif images in 2m resolution, shaded with sun azimuth 45 degrees - ASCII xyz (*.txt) grids in 2m resolution in UTM52S WGS84 - ESRI ascii (*.asc) grids in 2m resolution in UTM52S WGS84 - ESRI Rasters in 2m resolution - KMZ files