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Enhancing marine bathymetry using new generation satellite sensors. Highly accurate marine bathymetry are currently lacking in 72% of the global ocean including around Australia, particularly in shallow seas and near-shore coastal zones, contributing to various navigation and marine safety accidents. Ship surveys of the seafloor are time-consuming and expensive. Satellite altimetry data provide an alternative solution. This project will improve Australia’s marine bathymetry by using spatially co ....Enhancing marine bathymetry using new generation satellite sensors. Highly accurate marine bathymetry are currently lacking in 72% of the global ocean including around Australia, particularly in shallow seas and near-shore coastal zones, contributing to various navigation and marine safety accidents. Ship surveys of the seafloor are time-consuming and expensive. Satellite altimetry data provide an alternative solution. This project will improve Australia’s marine bathymetry by using spatially comprehensive and unprecedented data from new radar and laser satellite sensors. We aim to develop techniques for integration of the new data with other independent data sources, producing the most precise marine bathymetry for coastal terrain mapping, marine transport and safety management.Read moreRead less
Earthquake biases in measurements of Antarctica's sea-level contribution. This project aims to accurately determine Antarctica’s contribution to present-day sea-level. Large technique-specific systematic errors make this uncertain and controversial with the sign of change not agreed. Three of four measurement techniques rely on knowing the solid earth's changing shape or gravity field. Studies have not considered post-seismic deformation, but GPS data show that Antarctica has deformed since the ....Earthquake biases in measurements of Antarctica's sea-level contribution. This project aims to accurately determine Antarctica’s contribution to present-day sea-level. Large technique-specific systematic errors make this uncertain and controversial with the sign of change not agreed. Three of four measurement techniques rely on knowing the solid earth's changing shape or gravity field. Studies have not considered post-seismic deformation, but GPS data show that Antarctica has deformed since the 1998 Magnitude-8.2 Antarctic Plate Earthquake. This project will develop a model of these earthquakes constrained by geodetic data and use the model to estimate Antarctica's contribution to sea-level change. This should enable more confident local, national and international planning. This will benefit society through reducing the sea-level projection uncertainty.Read moreRead less
Quantifying sea-level trends and extremes along Australia's coastal margin. Multi-decadal changes in sea-level, and sea-level extremes, cannot be well quantified along most global coastlines, including Australia's, because the high spatial variability of sea-level is under-sampled by the sparse set of long, high quality tide gauge records. Satellite altimetry provides an alternative data source with greater spatial sampling, yet experiences contamination from land within tens of kilometres from ....Quantifying sea-level trends and extremes along Australia's coastal margin. Multi-decadal changes in sea-level, and sea-level extremes, cannot be well quantified along most global coastlines, including Australia's, because the high spatial variability of sea-level is under-sampled by the sparse set of long, high quality tide gauge records. Satellite altimetry provides an alternative data source with greater spatial sampling, yet experiences contamination from land within tens of kilometres from the coast and also suffers from regionally correlated biases. This project proposes to address these problems through re-tracking radar altimetry waveforms to derive new data in the coastal margin, enabling the production of new inferences on sea-level change and extremes at dramatically improved spatial resolution around Australia.Read moreRead less