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Earth Science | Oceans | Marine Sediments | Sediment Transport

11 record(s)

 

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From 1 - 10 / 11
  • This record describes the operations undertaken and geological sample data collected on the Fugro vessel REM Etive Charter Voyage RE2017_C01, titled "Great Australian Bight (GAB) Deep Water Geological and Benthic Ecology Program." This charter voyage took place from Hobart to Adelaide between the 13th of March and the 6th of April, 2017. The voyage, undertaken over 25 days, was a great success with 33 researchers from several research organisations and the vessel crew undertaking 40 operations over 5 target areas in water depths ranging from 1000 m to 3000 m. The voyage deployed a diverse range of instrumentation fully utilising the REM Etive capabilities which included two work class Remotely Operated Vehicles (ROV). This record contains video stills data recorded by the ROVs during the survey. Images can be accessed and downloaded via the Distribution links below.

  • This record describes the operations undertaken and geological sample data collected on the Fugro vessel REM Etive Charter Voyage RE2017_C01, titled "Great Australian Bight (GAB) Deep Water Geological and Benthic Ecology Program." This charter voyage took place from Hobart to Adelaide between the 13th of March and the 6th of April, 2017. The voyage, undertaken over 25 days, was a great success with 33 researchers from several research organisations and the vessel crew undertaking 40 operations over 5 target areas in water depths ranging from 1000 m to 3000 m. The voyage deployed a diverse range of instrumentation fully utilising the REM Etive capabilities which included two work class Remotely Operated Vehicles (ROV) and a Sea Floor Drill. This also involved the deployment of these equipment types significantly deeper than previous deployments either in Australia or worldwide. The data and samples collected significantly augment the sparse data and sample collections within the deep water GAB to date. Over 54 pieces of rock were individually collected by the ROVs, plus 162.98m of core drilled. This record contains data recorded during the survey including the activity log, observation log, operation log, a log of general photographs taken, descriptions of geology collected, biology catch locations, details of samples taken for analysis and the daily "Trip" details which defined the daily reporting periods. The Seafloor Drill 80mm diameter X 1m long Core sections were split and sampled for geochemical analysis. Remainders of the cores have been archived. Sampled half of the core at room temperature at the Perth Core Library, 37 Harris Street, Carlisle, WA 6101 phone +61 8 9470 0305. Images or documents of geological samples can be accessed and downloaded via the Distribution links below.

  • This record describes the Towed Camera video stills taken on the RV Investigator Charter Voyage IN2015_C01, titled "Great Australian Bight (GAB) Deep Water Geological and Benthic Ecology Program." This charter voyage took place from Hobart to Port Lincoln between the 22nd of October and the 28th of November, 2015. The voyage, undertaken over 34 days, was a great success with 37 researchers from seven research organisations and the vessel crew undertaking 128 operations over 17 target areas in water depths ranging from 700 m to 5,437 m. 23 towed camera operations were undertaken across the survey extents in water depths less than 3000m. Video data was collected for each of these operations. The collection of stills extracted from the towed camera videos can be obtained by contacting the data librarians or the person listed as the individual responsible for the data.

  • This record describes the Towed Camera video stills taken on the RV Investigator Charter Voyage IN2017_C01, titled "Great Australian Bight (GAB) Deep Water Geological and Benthic Ecology Program." This charter voyage took place from Hobart to Port Lincoln between the 11th and the 27th of April, 2017. The voyage, undertaken over 17 days, was a great success with 31 researchers from five research organisations and the vessel crew undertaking 47 operations over 6 target areas in water depths ranging from 200 m to 5,437 m. 3 towed camera operations were undertaken across the survey extents in water depths less than 3000m. Video data was collected for each of these operations. The collection of stills extracted from the towed camera videos can be obtained by contacting the data librarians or the person listed as the individual responsible for the data.

  • Presentation Abstract: Submerged sand banks in the northwest of Torres Strait typically have smaller dunes superimposed upon them. Survey work undertaken as part of the Torres Strait CRC measured the rates of sand dune migration on these banks in an effort to gauge their potential impact on local seagrass communities. Marine surveys at the end of the monsoon and trade wind seasons measured very similar hydrodynamic conditions but substantially different patterns of dune migration. At the end of the monsoon season migration rates of up to 17 meters were measured over a 14 day period, at the end of the trade wind season migration rates of up to 4 meters were measured over a similar time period. Wind data acquired for the two weeks before and during the monsoon season survey indicated the onset of the trade wind season during this time. As a result, the elevated levels of dune migration observed at the end monsoon season are probably the result of wind driven-currents, changing from predominantly eastwards during the monsoon season to predominantly westwards with the onset of the trade wind season. Dunes that were influenced by wind-driven currents during the monsoon season were east facing at the start of the trade wind season but these dunes then became hydrodynamically unstable under the influence of the westward-directed wind-driven currents and experienced accelerated levels of migration to the west. By comparison, the lower rates of sand dune migration observed during the trade wind season survey are considered to be representative of dunes that are hydrodynamically stable. The main conclusions from this research are that the dunes in the study area have been observed to move rapidly in response to seasonal changes in hydrodynamics however the typical rates of dune migration suggest that only seagrass communities in close proximity to the sandbanks are likely to be threatened by dune migration.

  • This record describes the operations undertaken and geological sample data collected on the RV Investigator Charter Voyage IN2017_C01, titled "Great Australian Bight (GAB) Deep Water Geological and Benthic Ecology Program." This charter voyage took place from and to Hobart between the 11th and the 27th of April, 2017. The voyage, undertaken over 17 days, was a great success with 31 researchers from five research organisations and the vessel crew undertaking 47 operations over 6 target areas in water depths ranging from 200 m to 5,437 m. The voyage deployed a diverse and large collection of instrumentation fully utilising the Investigator capabilities. This involved the deployment of some of the equipment types significantly deeper than previous deployments either in Australia or worldwide. The data and samples collected significantly augment the sparse data and sample collections within the deep water GAB to date. Over 1.28 tons of rock were collected. This record contains data recorded during the survey including the activity log, observation log, operation log, acoustic contact log, a log of general photographs taken, descriptions of geology collected, biology catch locations, details of samples taken for analysis, project details and the daily "Trip" details which defined the daily reporting periods. Images or documents of geological samples and acoustic contacts can be accessed and downloaded via the Distribution links below. Physical pieces of rock collected on this voyage were sampled for geochemical analysis. Remainders of the rocks have been archived at the Perth Core Library, 37 Harris Street, Carlisle, WA 6101 phone +61 8 9470 0305.

  • This record describes the operations undertaken and geological sample data collected on the RV Investigator Charter Voyage IN2015_C01, titled "Great Australian Bight (GAB) Deep Water Geological and Benthic Ecology Program." This charter voyage took place from Hobart to Port Lincoln between the 22nd of October and the 28th of November, 2015. The voyage, undertaken over 34 days, was a great success with 37 researchers from seven research organisations and the vessel crew undertaking 128 operations over 17 target areas in water depths ranging from 700 m to 5,437 m. The voyage deployed a diverse and large collection of instrumentation fully utilising the Investigator capabilities. This involved the deployment of some of the equipment types significantly deeper than previous deployments either in Australia or worldwide. The data and samples collected significantly augment the sparse data and sample collections within the deep water GAB to date. Over 1.36 tons of rock and 15.2 m of sediment core were collected. This record contains data recorded during the survey including the activity log, observation log, operation log, acoustic contact log, a log of general photographs taken, descriptions of geology collected, biology catch locations, details of sample taken for analysis, daily science reports produced, project details and the daily "Trip" details which defined the daily reporting periods. Images or documents of geological samples, cores and acoustic contacts can be accessed and downloaded via the Distribution links below. Physical pieces of rock collected on this voyage were sampled for geochemical analysis. Remainders of the rocks have been archived at the Perth Core Library, 37 Harris Street, Carlisle, WA 6101 phone +61 8 9470 0305.

  • This record describes the geological sample data collected on the RV Investigator Charter Voyage IN2015_C01, titled "Great Australian Bight (GAB) Deep Water Geological and Benthic Ecology Program." This charter voyage took place from Hobart to Port Lincoln between the 22nd of October and the 28th of November, 2015. The voyage, undertaken over 34 days, was a great success with 37 researchers from seven research organisations and the vessel crew undertaking 128 operations over 17 target areas in water depths ranging from 700 m to 5,437 m. The voyage deployed a diverse and large collection of instrumentation fully utilising the Investigator capabilities. This involved the deployment of some of the equipment types significantly deeper than previous deployments either in Australia or worldwide. The data and samples collected significantly augment the sparse data and sample collections within the deep water GAB to date. Over 1.36 tons of rock and 15.2 m of sediment core were collected. This record contains data from the analysis of geological samples collected. Documents and files of geological sample analyses can be accessed and downloaded via the Distribution links below.

  • This record describes the operations undertaken by an Autonomous Underwater Vehicle deployed from the FUGRO vessel Outer Limit in the Great Australian Bight (GAB). This charter voyage took place in November and December, 2015 as part of the Great Australian Bight (GAB) Deep Water Geological and Benthic Ecology Program, in conjunction with the IN2015_C01 survey. The voyage was a great success undertaking operations over 11 main target areas in water depths ranging from 900 m to 2,400 m. The AUV was equipped with a multibeam echo sounder, side scan sonar and sub bottom profiler, plus a HD camera system utilised during the small scale surveys over a further six selected areas within the 11 main target areas initially surveyed. High resolution bathymetry, backscatter and sidescan sonar data was collected along with photographic imagery of the seafloor. Track lines of the areas surveyed were also produced. A zip of the track lines (ESRI shapefiles) can be accessed and downloaded via the Distribution links below.

  • This record describes the Heat Flow Probe data collected on the RV Investigator Charter Voyage IN2015_C01, titled "Great Australian Bight (GAB) Deep Water Geological and Benthic Ecology Program." This charter voyage took place from Hobart to Port Lincoln between the 22nd of October and the 28th of November 2015. The Heat Flow Probe is a sediment penetrating device to measure depth-dependent sediment temperatures and sediment thermal parameters as thermal conductivity to determine marine geothermal heat flow. Calibration of analog/digital channels was done in laboratory; find calibration coefficients in the document 'CTM1000_Konstantenprotokoll_30°C.pdf.' Temperature NTC sensors were calibrated in deep sea (HF06, TRPBE_056), resulting T_Offsets are in file 'TOffset_HF06-ZB100546.dat;' for calibration details contact FIELAX GmbH. The raw data was processed during the voyage and stored in a custom raw (TOB) format and processed CSV format (refer to readme-HF-fomats.txt). On this particular voyage, the heat flow probe successfully performed the deepest measurements (in the Bight Basin, Offshore South Australia) to 5,432 m water depth, reaching a new record for FIELAX and our equipment. Access to the datasets is managed by CSIRO Energy (Clayton) as an output of the GAB Marine Program, and any publication requires prior approval.