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  • The coverage of this dataset is over the Taree region . The C3 LAS data set contains point data in LAS 1.2 format sourced from a LiDAR ( Light Detection and Ranging ) from an ALS50 ( Airborne Laser Scanner ) sensor . The processed data has been manually edited to achieve LPI classification level 3 whereby the ground class contains minimal non-ground points such as vegetation , water , bridges , temporary features , jetties etc . Purpose: To provide fit-for-purpose elevation data for use in applications related to coastal vulnerability assessment, natural resource management ( especially water and forests) , transportation and urban planning . Additional lineage information: This data has an accuracy of 0.3m ( 95 confidence ) horizontal with a minimum point density of one laser pulse per square metre. For more information on the data's accuracy, refer to the lineage provided in the data history .

  • Collaboration between Geoscience Australia and the Attorney Generals Department. The map series depicts local government areas in NT eligible for NDRRA assistance following natural disasters.

  • This job is part of the town capture program

  • In 2008, the Australian Parliament debated and passed the first national legislation to establish a title system of access and property rights for greenhouse gas (CO2) storage in offshore waters - the Offshore Petroleum and Greenhouse Gas Storage Act 2006 (the Act). The Act provides for petroleum titles and greenhouse gas storage titles to coexist. To manage possible interactions between petroleum and CO2 storage operations, the Act introduced a test to determine whether activities under one title would pose a significant risk of a significant adverse impact (SROSAI test) on pre-existing rights and assets under the other title. Where petroleum and CO2 storage projects are proposed in the same area, the Act provides for commercial agreements between petroleum and CO2 storage proponents. It is only in the absence of any such commercial agreements that the regulator will have to decide whether an activity under one title would pose a significant risk of a significant adverse impact on the operations within the other title area. The SROSAI test is based on three core parameters: - the probability of the occurrence of an adverse impact; - the cost of the adverse impact on the project; and - the total resource value of the project. In estimating the cost of an adverse impact the regulator will take into consideration whether the adverse impact will result in: - any increase in capital or operating costs; - any reduction in rate of recovery of petroleum or rate of injection of CO2; - any reduction in the quantity of the petroleum to be recovered or CO2 stored. Safety and environmental impacts would be considered in estimating costs, only if those impacts would contribute to an increase in capital or operating costs, or reduction in petroleum recovery or CO2 injection. Etc

  • Multiple new geophysical (airborne electromagnetics, borehole gamma and NMR), geospatial (LiDAR), sonic drilling and geochronological datasets have been used to map and resolve the nature of Quaternary fluvial deposition in the Lower Darling Valley (LDV), NSW. The LDV Cenozoic sequence contains Paleogene and Neogene shallow marine, fluvial and shoreline sediments overlain by Quaternary lacustrine, aeolian and fluvial units. In the LDV Quaternary fluvial sequence, multiple scroll-plain tracts are incised into higher, older more featureless floodplains. Prior to this study, these were respectively correlated to the Coonambidgal and Shepparton Formations of the Riverine Plain in the eastern Murray Basin and associated with the subsequently discarded Prior Stream/Ancestral River chronosequence of different climatically controlled depositional styles. In contrast to that proposition, we ascribe all LDV Quaternary fluvial deposition to lateral-migration depositional phases of one style, though with more variable stream discharges and channel and meander-scroll dimensions. Successively higher overbank-mud deposition through time obscures scroll traces and provides the main ongoing morphologic difference. A new morphostratigraphic unit, the Menindee Formation, refers to the mostly older and higher floodplain sediments, where scroll traces are obscured by overbank mud which continues to be deposited by the highest modern floods. Younger inset scroll-plain tracts, with visible scroll-plain traces, are still referred to the Coonambidgal Formation. Another new stratigraphic unit, the Willotia beds, refers to even older fluvial sediments, now above modern floodplain levels and mostly covered by aeolian sediments. This work provides important insights into hydrogeological processes and the nature of Australian Quaternary fluvial deposition.

  • A method for calibrating seismic stacking velocities against velocities from well measurements has been developed to quantitatively assess the validity of stacking velocities in the vicinity of boreholes and to improve quality of stacking velocities for use in regional depth conversion of interpreted seismic horizons. Accurate depth conversion of seismic interpretation is vital for use as constraints in gravity modelling and in other basin modelling tasks. Examples of this methodology are given for the northern Perth Basin, Australia. The suggested workflow for calibrating seismic stacking velocities against well velocities in a simplified form is as follows: 1. Check each velocity dataset for errors 2. Modify the datum of each dataset to the sea floor 3. Convert all datasets to two-way time and depth domain 4. Resample all velocity datasets to the same two-way time intervals 5. Cross plot stacking velocity depths near a well site with corresponding well depths for equal two-way times 6. Fit a linear polynomial to this cross-plot (higher order polynomials were tried also), and determine calibration coefficient from the gradient of the polynomial. 7. Grid calibration coefficients 8. Multiply depths derived from stacking velocities by calibration coefficient grid An assessment of depth conversion errors relative to wells shows that this methodology improves depth conversion results to within ±50 m down to the maximum well depth analysed (3.5 km below sea floor); this depth uncertainty translates into a modelled gravity anomaly error of about ±20 gu, which is acceptable for regional scale gravity modelling.

  • A multi-hazard and exposure analysis of Asia. A GIS study that incorporates regional data for: landslide, tsunami, earthquake, tropical cyclone, volcanic, drought and flood hazard.

  • The success of Aquifer Storage and Recovery (ASR) schemes rely on defining appropriate design and operational parameters in order to maintain high injection rates over the long term. The objective of this study was to develop a methodology to define the water quality criteria and hence minimum pre-treatment requirements to allow recharge at an acceptable scale. Laboratory column studies using four types of treated source water were performed at constant temperature (19°C) with light excluded, to determine the potential for near-well clogging for a proposed ASR scheme. The source water was turbid raw water from the Darling River and three treated waters including bank filtration, coagulation, and coagulation and granular activated carbon (GAC). Over the 37 days of the experiment, declines in hydraulic conductivity occurred in the columns packed with representative aquifer fluvial sands. The GAC treated town water gave an 8% decline in hydraulic conductivity, which was significantly different from the other three source waters with mean declines of 26-29%. Over the first 3 cm of column length, where most clogging occurred in each column, the mean hydraulic conductivity declined by 10% for GAC treated water compared with 40 to 50% for the other source waters. Evidence from polysaccharide concentrations and bacterial numbers in columns when they were dissected and analysed at the end of the experiment confirmed that biological growth was the dominant form of clogging in the treated waters. Further chemical clogging through precipitation of minerals was found not to occur within the laboratory columns, and dispersion of clay was also found to be negligible.

  • This job was planned due to a requirement for high accuracy aerial photography to be used as part of a cadastral adjustment program. The high quality laser derived surface means that there would be minimal distortion on the part of the imagery and so it would suit the purpose well. The job was extended beyond the immediate town extents as the council was also interested in floodplain mapping and cadastral adjustment in the surrounds.