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Shipboard Multibeam Backscatter Grids - Caswell Sub-basin, Browse Basin Marine Survey (GA0345/GA0346/TAN1411)  


Authors / CoAuthors

Siwabessy, J.

Abstract

Geoscience Australia (GA) conducted a marine survey (GA0345/GA0346/TAN1411) of the north-eastern Browse Basin (Caswell Sub-basin) between 9 October and 9 November 2014 to acquire seabed and shallow geological information to support an assessment of the CO2 storage potential of the basin. The survey, undertaken as part of the Department of Industry and Science's National CO2 Infrastructure Plan (NCIP), aimed to identify and characterise indicators of natural hydrocarbon or fluid seepage that may indicate compromised seal integrity in the region. The survey was conducted in three legs aboard the New Zealand research vessel RV Tangaroa, and included scientists and technical staff from GA, the NZ National Institute of Water and Atmospheric Research Ltd. (NIWA) and Fugro Survey Pty Ltd. Shipboard data (survey ID GA0345) collected included multibeam sonar bathymetry and backscatter over 12 areas (A1, A2, A3, A4, A6b, A7, A8, B1, C1, C2b, F1, M1) totalling 455 km2 in water depths ranging from 90 - 430 m, and 611 km of sub-bottom profile lines. Seabed samples were collected from 48 stations and included 99 Smith-McIntyre grabs and 41 piston cores. An Autonomous Underwater Vehicle (AUV) (survey ID GA0346) collected higher-resolution multibeam sonar bathymetry and backscatter data, totalling 7.7 km2, along with 71 line km of side scan sonar, underwater camera and sub-bottom profile data. Twenty two Remotely Operated Vehicle (ROV) missions collected 31 hours of underwater video, 657 still images, eight grabs and one core. This catalogue entry refers to the shipboard multibeam backscatter grids produced for the twelve survey areas (Areas A1, A2, A3, A4, A6b, A7, A8, B1, C1, C2b, F1b and M1; 455 km2).

Product Type

dataset

eCat Id

83918

Contact for the resource

  Custodian

RD  

  Owner

Commonwealth of Australia (Geoscience Australia)  

  Custodian

Commonwealth of Australia (Geoscience Australia)  
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia

Digital Object Identifier

http://dx.doi.org/10.4225/25/5b289aa26deb5

Keywords

( Theme )
  • Exclusive Economic Zone
( Theme )
  • backscatter
( Theme )
  • marine environmental baselines
( Theme )
  • marine survey
( Theme )
  • geological storage of CO2
  • Australian EEZ
Australian and New Zealand Standard Research Classification (ANZSRC)
  • Marine Geoscience
  • Published_External

Publication Date

2016-06-06T14:00:00

Creation Date

2015-01-01T00:00:00

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Access - license

Use - license

Status

Purpose

Maintenance Information

asNeeded

Topic Category

oceans

Series Information

Record

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

[-14.2865, -12.8678, 122.3883, 124.6521]

Reference System

Spatial Resolution

Service Information

Associations

Downloads and Links

Download the data (esri ascii)  

Download the data (esri grid)  

Download the data (geotif)  

Download the data (kml)  

Download the metadata (pdf)  

Download the data (xyz ascii)  

Caswell Sub-basin - Browse Basin CO2 data package  

Source Information

Datasets collected and in WGS84 UTM 51 S, extent indicator for the metadata record however is in GDA94 to be consistent with other national scale metadata records. The multibeam bathymetry was acquired by the following survey: - Processing software: CARIS HIPS & SIPS v7.1 SP2 - Survey Name: Browse Basin 2014 Marine Survey (GA0345/TAN1411) - Vessel Name: RV Tangaroa - Institution: Geoscience Australia - Country: Australia - Operator: NIWA - Multibeam system: Kongsberg EM302 - Year of installation: Unknown - Nominal sonar frequency: 30 kHz - Number of beams: 288 beams - Max number of soundings: 432 - Beamwidth across track: Unknown - Beamwidth along track: Unknown - Pulse length: variable - Selectable depth range: Unknown - Vessel speed: 7 - 8 knots - Start Date: 09/10/2014 - End Date: 11/11/2014 - Start Port: Darwin - End Port: Darwin - Number of grids: 12 - Total surface coverage: 455 Km2 - Vertical Datum: MSL - Horizontal Datum: WGS84-51S - Survey leaders: Chris Nicholson - Data acquired and processed by: NIWA, Justy Siwabessy - Grids resolution: 5m - This dataset consist of the following files: + Georeferenced colour tif image in 5m resolution, shaded with sun azimuth 45 degrees + ESRI ascii (*.asc) in 5m resolution + ASCII xyz (*.txt) in 5m resolution + ESRI Raster in 5m resolution + KMZ file 122.3883 124.6521 -14.2865 -12.8678



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