dc.contributor.author |
Theron, Andre
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|
dc.contributor.author |
Engelbrecht, Jeanine
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|
dc.contributor.author |
Kemp, J
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dc.contributor.author |
Kleynhans, Waldo
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dc.contributor.author |
Turnbull, T
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|
dc.date.accessioned |
2017-07-28T09:37:29Z |
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dc.date.available |
2017-07-28T09:37:29Z |
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dc.date.issued |
2017-06 |
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dc.identifier.citation |
Theron, A., Engelbrecht, J., Kemp, J., Kleynhans, W. and Turnbull, T. 2017. Detection of sinkhole precursors through SAR interferometry: radar and geological considerations. IEEE Transactions on Geoscience and Remote Sensing Letters, 14(6), pp 871-875 |
en_US |
dc.identifier.issn |
0196-2892 |
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dc.identifier.uri |
http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7895138
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|
dc.identifier.uri |
http://hdl.handle.net/10204/9413
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|
dc.description |
Copyright: 2017 Institute of Electrical and Electronics Engineers (IEEE). This is a pre-print version. The definitive version of the work is published in IEEE Transactions on Geoscience and Remote Sensing Letters, 14(6), pp 871 - 875 |
en_US |
dc.description.abstract |
Sinkholes are an unpredictable geohazard that endanger life and property in dolomitic terrains. Sinkholes are a significant threat in Gauteng, South Africa’s most populated and urbanized province. Small-scale surface subsidence is frequently present prior to the collapse of a sinkhole. Therefore, the presence of precursory surface deformation can be exploited to develop early warning systems. Spaceborne synthetic aperture radar (SAR) differential interferometry (DInSAR) is able to monitor small-scale surface deformation over large areas and can be used to detect and measure precursors to sinkhole development. This letter investigates the use of repeat-pass DInSAR to detect sinkhole precursors in the Gauteng province. Twenty stripmap acquisitions from TerraSAR-X were acquired over a full year. DInSAR results revealed the presence of three previously unknown deformation features, one of which could be confirmed by subsequent field investigations. Furthermore, a water supply pipeline ruptured six months after the initial observation. The detection of the deformation, therefore, provided a viable early warning to landowners who were unaware of the subsidence. Detected deformation features were between 40 and 100 m in diameter. The maximum displacement measured was 50 mm over 55 days. Despite the successful detection, seven sinkhole events occurred in the observation period, for which no deformation could be detected. The results indicate that high-resolution X-band interferometry is able to monitor dolomite-induced instability in an urban environment. However, considerations related to SAR interferometry and physical sinkhole properties need to be addressed before DInSAR can be used in an operational early warning system. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
Institute of Electrical and Electronics Engineers (IEEE) |
en_US |
dc.relation.ispartofseries |
Workflow;18010 |
|
dc.subject |
Interferometry |
en_US |
dc.subject |
Synthetic aperture radar |
en_US |
dc.subject |
Geology |
en_US |
dc.subject |
Hazardous areas |
en_US |
dc.title |
Detection of sinkhole precursors through SAR interferometry: radar and geological considerations |
en_US |
dc.type |
Article |
en_US |
dc.identifier.apacitation |
Theron, A., Engelbrecht, J., Kemp, J., Kleynhans, W., & Turnbull, T. (2017). Detection of sinkhole precursors through SAR interferometry: radar and geological considerations. http://hdl.handle.net/10204/9413 |
en_ZA |
dc.identifier.chicagocitation |
Theron, Andre, Jeanine Engelbrecht, J Kemp, Waldo Kleynhans, and T Turnbull "Detection of sinkhole precursors through SAR interferometry: radar and geological considerations." (2017) http://hdl.handle.net/10204/9413 |
en_ZA |
dc.identifier.vancouvercitation |
Theron A, Engelbrecht J, Kemp J, Kleynhans W, Turnbull T. Detection of sinkhole precursors through SAR interferometry: radar and geological considerations. 2017; http://hdl.handle.net/10204/9413. |
en_ZA |
dc.identifier.ris |
TY - Article
AU - Theron, Andre
AU - Engelbrecht, Jeanine
AU - Kemp, J
AU - Kleynhans, Waldo
AU - Turnbull, T
AB - Sinkholes are an unpredictable geohazard that endanger life and property in dolomitic terrains. Sinkholes are a significant threat in Gauteng, South Africa’s most populated and urbanized province. Small-scale surface subsidence is frequently present prior to the collapse of a sinkhole. Therefore, the presence of precursory surface deformation can be exploited to develop early warning systems. Spaceborne synthetic aperture radar (SAR) differential interferometry (DInSAR) is able to monitor small-scale surface deformation over large areas and can be used to detect and measure precursors to sinkhole development. This letter investigates the use of repeat-pass DInSAR to detect sinkhole precursors in the Gauteng province. Twenty stripmap acquisitions from TerraSAR-X were acquired over a full year. DInSAR results revealed the presence of three previously unknown deformation features, one of which could be confirmed by subsequent field investigations. Furthermore, a water supply pipeline ruptured six months after the initial observation. The detection of the deformation, therefore, provided a viable early warning to landowners who were unaware of the subsidence. Detected deformation features were between 40 and 100 m in diameter. The maximum displacement measured was 50 mm over 55 days. Despite the successful detection, seven sinkhole events occurred in the observation period, for which no deformation could be detected. The results indicate that high-resolution X-band interferometry is able to monitor dolomite-induced instability in an urban environment. However, considerations related to SAR interferometry and physical sinkhole properties need to be addressed before DInSAR can be used in an operational early warning system.
DA - 2017-06
DB - ResearchSpace
DP - CSIR
KW - Interferometry
KW - Synthetic aperture radar
KW - Geology
KW - Hazardous areas
LK - https://researchspace.csir.co.za
PY - 2017
SM - 0196-2892
T1 - Detection of sinkhole precursors through SAR interferometry: radar and geological considerations
TI - Detection of sinkhole precursors through SAR interferometry: radar and geological considerations
UR - http://hdl.handle.net/10204/9413
ER -
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en_ZA |