Geophysical investigation of mine waste in the King River Delta, Macquarie Harbour, Tasmania

Cracknell, Matthew J.; Nascimento, Sibele C.; Heng, Wei Xuen; Parbhakar-Fox, Anita; Schaap, Thomas A.

doi:10.1080/22020586.2019.12072938

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…Mine tailings are a source of potential pollution [45] or reprocessing materials [46]. Using the UAV image-based estimation of the volume, we found that the network RTK GNSS positioning technique's volumes had the smallest deviation (the absolute difference was up to 0.4% of the reference volume) compared to the reference volume from the initial data obtained using network RTK GNSS positioning.…”

Section: Discussionmentioning

confidence: 95%

Image Mapping Accuracy Evaluation Using UAV with Standalone, Differential (RTK), and PPP GNSS Positioning Techniques in an Abandoned Mine Site

Kim

Hyun

Park

et al. 2023

Sensors

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Global navigation satellite systems (GNSSs) provide a common positioning method that utilizes satellite signals to determine the spatial location of a receiver. However, there are several error factors in standalone GNSS positioning due to instrumental, procedural, and environmental factors that arise during the signal transmission process, and the final positioning error can be up to several meters or greater in length. Thus, real-time kinematic (RTK) correction and post-mission precise point positioning (PPP) processing technologies are proposed to improve accuracy and accomplish precise position measurements. To evaluate the geolocation accuracy of mosaicked UAV images of an abandoned mine site, we compared each orthomosaic image and digital elevation model obtained using standalone GNSS positioning, differential (RTK) GNSS positioning, and post-mission PPP processing techniques. In the three types of error evaluation measure (i.e., relative camera location error, ground control points-based absolute image mapping error, and volumetric difference of mine tailings), we found that the RTK GNSS positioning method obtained the best performance in terms of the relative camera location error and the absolute image mapping error evaluations, and the PPP post-processing correction effectively reduced the error (69.5% of the average total relative camera location error and 59.3% of the average total absolute image mapping error) relative to the standalone GNSS positioning method. Although differential (RTK) GNSS positioning is widely used in positioning applications that require very high accuracy, post-mission PPP processing can also be used in various fields in which it is either not feasible to operate expensive equipment to receive RTK GNSS signals or network RTK services are unavailable.

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Section: Discussionmentioning

confidence: 95%

Image Mapping Accuracy Evaluation Using UAV with Standalone, Differential (RTK), and PPP GNSS Positioning Techniques in an Abandoned Mine Site

Kim

Hyun

Park

et al. 2023

Sensors

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“…Nevertheless, to predict how future climate scenarios might affect harbour dynamics, it is vital to understand how the system currently responds to present drivers. Much of the previous literature describing the oceanography and environmental status of Macquarie Harbour has focused on the effects of copper mine discharge (Carpenter et al 1991;Koehnken 1996;Featherstone et al1997;Stauber et al 2000;Eriksen et al 2001;Teasdale et al 2003, Augustinus et al 2010Cracknell et al 2019. Recently, Hartstein et al 2019and Maxey et al 2020 have expanded the understanding of the physical and biological oceanography (initially described by Cresswell et al 1989) of the Harbour.…”

Section: Study Areamentioning

confidence: 99%

The influence of mesoscale climate drivers on hypoxia in a fjord-like deep coastal inlet and its potential implications regarding climate change and greenhouse gas production: examining a decade of water quality data

Maxey

Hartstein

Mujahid

et al. 2022

Preprint

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Abstract. Deep coastal inlets are sites of high sedimentation and organic carbon deposition that account for 11 % of the world's organic carbon burial. Australasia's mid to high latitude regions have many such systems. It is important to understand the role of climate forcings in influencing hypoxia and organic matter cycling in these systems, but many such systems, especially in Australasia, remain poorly described. We analysed a decade of in-situ water quality data from Macquarie Harbour, Tasmania, a deep coastal inlet with more than 180,000 tons of organic carbon loading per annum. Monthly dissolved oxygen, total Kjeldhal nitrogen, dissolved organic carbon, and dissolved inorganic nitrogen concentrations were significantly affected by rainfall patterns. Increased rainfall was correlated to higher organic carbon and nitrogen loading, lower oxygen concentrations in deep basins, and greater oxygen concentrations in surface waters. Most notably, the Southern Annular Mode (SAM) significantly influenced oxygen distribution in the system. High river flow (associated with low SAM index values) impedes deep water renewal as the primary mechanism driving basin water hypoxia. Climate forecasting predicted increased winter rainfall and decreased summer rainfall, which may further exacerbate hypoxia in this system. Currently, the Harbour basins experience frequent (up to 36 % of the time) and prolonged (up to 2 years) oxygen-poor conditions with the potential to promote greenhouse gas (CH4, N2O) production. Increased greenhouse gas production will alter the processing of organic matter entering the system. The increased winter rainfall predicted for the area will potentially increase greenhouse gas emissions due to increased spread and duration of hypoxia in the basins. Further understanding of these systems and how they respond to climate change will improve our estimates of future organic matter cycling (burial vs export) and greenhouse gas production.

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“…Much of the previous literature describing the oceanography and environmental status of Macquarie Harbour has focused on the effects of copper mine discharge (Carpenter et al, 1991;Koehnken, 2006;Featherstone and O'Grady, 1997;Stauber et al, 2000;Eriksen et al, 2001;Teasdale et al, 2003;Augustinus et al, 2010;Cracknell et al, 2019). Recently, Hartstein et al (2019) and Maxey et al (2020) have expanded the understanding of the physical and biological oceanography (initially described by Cresswell et al, 1989) of the harbour.…”

Section: Study Areamentioning

confidence: 99%

The influence of mesoscale climate drivers on hypoxia in a fjord-like deep coastal inlet and its potential implications regarding climate change: examining a decade of water quality data

Maxey

Hartstein²,

Mujahid³

et al. 2022

Biogeosciences

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Abstract. Deep coastal inlets are sites of high sedimentation and organic carbon deposition that account for 11 % of the world's organic carbon burial. Australasia's mid- to high-latitude regions have many such systems. It is important to understand the role of climate forcings in influencing hypoxia and organic matter cycling in these systems, but many such systems, especially in Australasia, remain poorly described. We analysed a decade of in situ water quality data from Macquarie Harbour, Tasmania, a deep coastal inlet with more than 180 000 t of organic carbon loading per annum. Monthly dissolved oxygen, total Kjeldahl nitrogen, dissolved organic carbon, and dissolved inorganic nitrogen concentrations were significantly affected by rainfall patterns. Increased rainfall was correlated to higher organic carbon and nitrogen loading, lower oxygen concentrations in deep basins, and greater oxygen concentrations in surface waters. Most notably, the Southern Annular Mode (SAM) significantly influenced oxygen distribution in the system. High river flow (associated with low SAM index values) impedes deep water renewal as the primary mechanism driving basin water hypoxia. Climate forecasting predicts increased winter rainfall and decreased summer rainfall, which may further exacerbate hypoxia in this system. Currently, Macquarie Harbour's basins experience frequent (up to 36 % of the time) and prolonged (up to 2 years) oxygen-poor conditions that may promote greenhouse gas (CH4, N2O) production altering the processing of organic matter entering the system. The increased winter rainfall predicted for the area will likely promote the increased spread and duration of hypoxia in the basins. Further understanding of these systems and how they respond to climate change will improve our estimates of future organic matter cycling (burial vs. export).

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Geophysical investigation of mine waste in the King River Delta, Macquarie Harbour, Tasmania

Cited by 4 publications

References 2 publications

Image Mapping Accuracy Evaluation Using UAV with Standalone, Differential (RTK), and PPP GNSS Positioning Techniques in an Abandoned Mine Site

Image Mapping Accuracy Evaluation Using UAV with Standalone, Differential (RTK), and PPP GNSS Positioning Techniques in an Abandoned Mine Site

The influence of mesoscale climate drivers on hypoxia in a fjord-like deep coastal inlet and its potential implications regarding climate change and greenhouse gas production: examining a decade of water quality data

The influence of mesoscale climate drivers on hypoxia in a fjord-like deep coastal inlet and its potential implications regarding climate change: examining a decade of water quality data

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