Land Subsidence Detection and Monitoring Using InSAR in Australia

Cormick, Jacob (2019) Land Subsidence Detection and Monitoring Using InSAR in Australia. [USQ Project]

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The land surface is under constant movement in both horizontal and vertical directions. In some extreme circumstances there can be a sudden and significant subsidence event occur. These can be attributed to natural movement through earthquakes or through human intervention through extractive industries. Where these events occur, they can cause significant damage to the public infrastructure, housing and interruption to the people who live there. In some locations throughout Australia the disused underground mine sites are being developed into housing developments, particularly those close to urban areas such as Collingwood Park, Queensland. In the past in these there have been subsidence events occur and result in significant cost to the Government in damages.

Due to the high costs incurred with traditional monitoring techniques it has been cost prohibitive to provide ongoing monitoring to areas, where these events occur with long time periods separating the events. In more recent times through an increase of earth observation satellites with onboard Synthetic Aperture Radar (SAR) sensors have decreased the time period of acquisition. This has improved the results and reliability of the remote sensing technique known as Differential Interferometric Synthetic Aperture Radar (DInSAR). Therefore, making ongoing monitoring of these areas more economical which provides a significant benefit to these areas for ongoing monitoring.

This project conducted research into the detection and monitoring of Collingwood Park, Queensland located west of the city of Brisbane using the DInSAR technique. This site was chosen due to it having historically experienced subsidence events due to the collapse of the decommissioned underground mine. Due to its location it is an area where this type of research could be of great benefit and has the potential to provide the desired results.

The project used several data sets between the period of November 2015 to December 2018 acquired by the Sentinel 1A satellite which is part of the broader earth observation mission Copernicus. These data sets were obtained through Alaskan Satellite Facility Vertex system. The generated results indicate that no significant subsidence event had occurred during this time period and the area remained reasonably stable to June 2018. The results for the time period June 2018 to December 2018 do indicate some parts of the suburb had experienced some movement averaging around 0.008 meters of uplift for that area. Upon further processing it was indicated that this had occurred somewhere in the period of October to December 2018, this result was surprising as any movement in the area was expected to be subsidence.

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Item Type: USQ Project
Item Status: Live Archive
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Gharineiat, Zahra
Qualification: Bachelor of Spatial Science (Honours) (Surveying)
Date Deposited: 12 Aug 2021 01:26
Last Modified: 26 Jun 2023 22:21

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