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This record describes multibeam echosounder data collected on RV Investigator voyage IN2018_C01, 'RAN Hydrographic Survey' which departed Hobart on the 28th May 2018 and returned to Hobart on the 8th June 2018. The overall focus for this survey was to conduct a modern survey in the primary shipping route through Bass Strait and to To facilitate safe navigation for international and coastal shipping. The Kongsberg EM710 MKII multibeam echosounder was used to acquire seafloor bathymetry and backscatter information (and watercolumn backscatter) near Wilson's Promontory in Bass Strait and during the transit from and to Hobart. The EM710 MKII provides a 0.5° by 1° transmit and receive angular resolution respectively. The echosounder's nominal frequency range is from 40 to 100 kHz. Data are stored in *.all raw format for bathymetry and backscatter and *.wcd format for watercolumn backscatter at CSIRO. There are 372 files totalling 119 GB of raw bathymetry & backscatter data, and 241 files totalling 269 GB of raw watercolumn data in this dataset. Sound velocity profiles were applied to this data during data acquisition. Bathymetry data contained in *.all format are corrected for motion and position. Tide corrections were applied to the processed data. Processed data has had outliers removed. Processed line data are available in *.gsf and ascii format, and processed bathymetry and backscatter grids in geotiff format. Additional information regarding this dataset, including further information on processing streams, is contained in the GSM data acquisition and processing report. Additional data products may be available on request.
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As part of the Pilbara Marine Conservation Partnership (PMCP), coral reef surveys of reef macroalgae species (including seagrasses) were undertaken between northern Ningaloo and the Dampier Archipelago. This dataset contains biomass estimates (g DW m-2 and g WW m-2) of macrophytes collected in shallow reef areas in the Pilbara region during two sampling trips: November 2013 and May 2014. Surveys were undertaken using using SCUBA at depths between 2-13m, with macroalgae and seagrasses identified to the lowest possible taxonomic level. The data include: * Macroalgae and seagrass diversity (0.25 square metre quadrats) * Macroalgae and seagrass species composition and biomass per quadrat (0.25 square metre) These data were collected to estimate macrophyte biomass in shallow reef areas across the Pilbara region in two contrasting seasons. These data are an output of the Pilbara Marine Conservation Partnership (PMCP) Coral Reef Health Theme.
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Satellite altimeter data from the radar altimeter on board the joint France/US Jason-1 Mission, comprising Global (66S -> 66N) sea surface height anomalies along ground tracks which are repeated every 10 days. The dataset is approximately 622 Mb and the period covered is January 2002 to January 2004. The data was provided by JPL/NASA in the USA and has been processed at CSIRO Marine Research in Hobart to a uniform grid spacing and format. Jason-1 is the follow-on mission to TOPEX/Poseidon. Available on-line on the CSIRO Marine Research network; also available to outside users on request.
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Farm A in Hashmi et al. (2002) was used to calibrate uptake for the modelled prawns, and the intent was to use Farm B to validate our model of uptake. The contaminants selected were lead, cadmium and copper. These contaminants were selected mainly because they were metals we were already considering to use in NWS-InVitro. Parameters were chosen for the uptake rates of the metals which gave rise to a profile comparable to that for the prawns taken from Farm A. The simulation was run for six years, during which time the contaminate output levels were held constant. Currents were held constant in hourly intervals, as were the plumes they advected and diffused. The simulation tracked the levels of contaminants in the water and in the prawns that passed through the region affected by the plume. A piecewise linear function was introduced to allow the rate of uptake to vary in a controlled way. With much validation, the model provides the best available representation of contaminant impacts on prawns in Nickol Bay. This facilitated relatively straightforward reproduction of the uptake of contaminants. Abstract extracted from detailed documentation
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Outlines of islands and reefs in the Torres Strait region. Generated as a layer to use in the eAtlas web-portal, as a base map layer.
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Live coral cover of reefs in the Torres Strait Generated as a layer to use in the eAtlas web-portal, as a base map layer.
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Contaminants were modelled as nested sets of polygons representing plumes of differing concentrations spreading from their source. Nodes of the polygons were advected by the currents and 'diffused' at each time step until the contour became so dilute that it was eliminated because the concentrations reached the lower threshold for tracking. Nodes of the plume were also excised if the plume became so thin that the nodes were very close to each other. The temporal spatial footprint is presented as an image time series.
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Satellite altimeter data from the radar altimeter on board the European ERS-2 satellite, comprising Global (81S -> 81N) sea surface height anomalies along ground tracks which are repeated every 35 days. There are two versions of this dataset. Each version is approximately 620 Mb and the period covered is May 1995 to July 2003. This data set is also known as "ERS-2, phase A", but there are no phases B, C,... One of the versions ("cor") has had a long-wavelength correction applied. The other version ("raw") has not had this correction applied. The data was provided by Aviso/CNES in France and has been reformatted at CSIRO Marine Research in Hobart to a uniform grid spacing and format. Available on-line on the CSIRO Marine Research network; also available to outside users on request.
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The model used to compute the currents on the North West Shelf was developed within CSIRO Marine Research and is referred to as MECO (Model for Estuaries and Coastal Oceans). It is a general-purpose finite difference hydrodynamic model applicable to scales ranging from estuaries to ocean basins. It has found previous applications in systems such as the Derwent and Huon Estuaries in Tasmania, Gippsland Lakes, Port Phillip Bay (Walker 1999), Bass Strait, the Great Australian Bight and South-eastern Australia (Bruce et al. 2001), and the Gulf of Carpentaria (Condie et al. 1999). A full description of the circulation model as applied to North West Shelf and descriptions of the spatial and temporal characteristics of the circulation and connectivity can be found in Condie(2004).
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The iconic species examined in the MSE are turtles and sharks. For both groups the populations are represented by the animal agent model for post-larval stages and spatial dynamics and the blastula agent for reproduction and spatial dynamics of very early life history stages. This representation enables density dependent processes to apply to natural mortality at larval and post-larval stages and to egg production. It allows spatially explicit treatment of larval and post-larval stages, but there is no explicit spatial structure at the egg stage other than eggs being confined to their suitable habitat. Biological parameter values for the species were taken from the literature and modified slightly during model calibration to give plausible biomass levels under the levels of fishing pressure or catch recorded from the North West Shelf.