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Long-Term Deflection Monitoring for Bridges Using X and C-Band Time-Series SAR Interferometry
- Source :
- Remote Sensing; Volume 11; Issue 11; Pages: 1258, Remote Sensing, Vol 11, Iss 11, p 1258 (2019)
- Publication Year :
- 2019
- Publisher :
- MDPI AG, 2019.
-
Abstract
- This study aims to monitor the deformation of bridges, namely in the form of long-term deflection and thermal dilation, using multi-temporal interferometric synthetic aperture radar (InSAR) observations. To precisely estimate the vertical and longitudinal displacements, we used the InSAR time-series technique with multi-track stacks of Sentinel-1 SAR dataset and a single-track stack of COSMO-SkyMed SAR data over two extradosed bridge cases; Kimdaejung and Muyoung bridges between 2013 and 2017. The vertical and longitudinal displacements are estimated using multi-track Sentinel-1 SAR data and orientation angle of bridges, and we converted the displacements into thermal dilation and long-term vertical deflection. From COSMO-SkyMed data, we calculated the horizontal thermal dilation and long-term vertical deflection assuming that they dominantly contribute to the horizontal and vertical displacements, respectively. This assumption appeared reasonable based on the comparison with calculations from Sentinel-1 data. The deflection patterns exhibit downward movements at the mid-spans between towers. The results reveal that both bridges have been suffering long-term deflection over the observation period. Thus, this study verifies the potential to monitor the long-term deflection and implies that the bridges need to be monitored periodically.
- Subjects :
- bridge monitoring
010504 meteorology & atmospheric sciences
C band
Observation period
0211 other engineering and technologies
Vertical deflection
02 engineering and technology
SAR interferometry
Geodesy
01 natural sciences
Interferometry
Stack (abstract data type)
PSI
long-term deflection
thermal dilation
Deflection (engineering)
Thermal
Interferometric synthetic aperture radar
General Earth and Planetary Sciences
lcsh:Q
lcsh:Science
Geology
021101 geological & geomatics engineering
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 20724292
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- Remote Sensing
- Accession number :
- edsair.doi.dedup.....6688ae121fe0592fc8891c223611c6a4