Remote monitoring to predict bridge scour failure using Interferometric Synthetic Aperture Radar (InSAR) stacking techniques

Selvakumaran, Sivasakthy; Plank, Simon; Geiß, Christian; Rossi, Cristian; Middleton, Campbell

doi:10.1016/j.jag.2018.07.004

Cited by 89 publications

(76 citation statements)

References 23 publications

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“…While these techniques cannot decisively distinguish between stress accumulation or material degradation processes, they are useful to detect structural distress signs. A dedicated study of the available literature also confirms how these methods proved to be crucial in characterizing three-dimensional displacements with millimetric accuracy and capable of highlighting anomalous behaviors in near-real time [17,18]. The comprehensive multi-sensor dataset available for the Morandi bridge collapse allows us to make several unique considerations regarding the overall quality of the presented data, the future use of such data for a near-real time monitoring system and bridge construction guidelines.…”

Section: Discussionsupporting

confidence: 52%

“…However, when the InSAR technique is applied to urban areas, the interpretation of phenomena occurring at a local scale or at the level of a single structure remains challenging. While a stand-alone InSAR multi-temporal analysis can be used as a straightforward indicator of structural instability [17,18], only a synergistic approach allows to make sense of information inferred from different satellite datasets [19]. Moreover, probabilistic procedures are required to infer the three-dimensional field of displacement enabling the structural evaluation of individual assets [1].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Pre-Collapse Space Geodetic Observations of Critical Infrastructure: The Morandi Bridge, Genoa, Italy

Milillo

Giardina

Perissin³

et al. 2019

Remote Sensing

125

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We present a methodology for the assessment of possible pre-failure bridge deformations, based on Synthetic Aperture Radar (SAR) observations. We apply this methodology to obtain a detailed 15-year survey of the Morandi bridge (Polcevera Viaduct) in the form of relative displacements across the structure prior to its collapse on August 14th 2018. We generated a displacement map for the structure from space-based SAR measurements acquired by the Italian constellation COSMO-SkyMed and the European constellation Sentinel-1A/B over the period 2009–2018. Historical satellite datasets include Envisat data spanning 2003–2011. The map reveals that the bridge was undergoing an increased magnitude of deformations over time prior to its collapse. This technique shows that the deck next to the collapsed pier was characterized since 2015 by increasing relative displacements. The COSMO-SkyMed dataset reveals the increased deformation magnitude over time of several points located near the strands of this deck between 12th March 2017 and August 2018.

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Section: Discussionsupporting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Pre-Collapse Space Geodetic Observations of Critical Infrastructure: The Morandi Bridge, Genoa, Italy

Milillo

Giardina

Perissin³

et al. 2019

Remote Sensing

125

View full text Add to dashboard Cite

show abstract

“…According to [39], the consolidation of the soft layer where the piers are located extensively affects ground subsidence and leads to the subsidence of the bridge as well. Further, significant displacements can be introduced by scouring effects, finally leading the bridge to collapse [40,41]. However, our cases seem to be unlike the above cases.…”

Section: Discussionmentioning

confidence: 55%

Long-Term Deflection Monitoring for Bridges Using X and C-Band Time-Series SAR Interferometry

et al. 2019

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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.

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“…(1) Pulse or radar devices [16][17][18] High Medium (2) Single-use or float-out devices [19] Low Medium (3) Fiber-Bragg grating systems [20,21] Low Low (4) Sounding or driven rod systems [19,22,23] Medium Medium (5) Sound wave devices [24][25][26] High High (6) Electrical conductivity devices [27] High Medium (7) Dielectric probes [28] High Medium Indirect Scour Measurement Devices (8) Tilt sensors [19,24] Low (9) Accelerometers [26,[29][30][31] Low (10) GPS [32,33] Medium (11) Satellite [34,35] Low…”

Section: Measurement During Extreme Event Scour Depth Resolution Detementioning

confidence: 99%

Electromagnetic Sensors for Underwater Scour Monitoring

Maroni

Tubaldi

Ferguson

et al. 2020

Sensors

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Scour jeopardises the safety of many civil engineering structures with foundations in riverbeds and it is the leading cause for the collapse of bridges worldwide. Current approaches for bridge scour risk management rely mainly on visual inspections, which provide unreliable estimates of scour and of its effects, also considering the difficulties in visually monitoring the riverbed erosion around submerged foundations. Thus, there is a need to introduce systems capable of continuously monitoring the evolution of scour at bridge foundations, even during extreme flood events. This paper illustrates the development and deployment of a scour monitoring system consisting of smart probes equipped with electromagnetic sensors. This is the first application of this type of sensing probes to a real case-study for continuous scour monitoring. Designed to observe changes in the permittivity of the medium around bridge foundations, the sensors allow for detection of scour depths and the assessment of whether the scour hole has been refilled. The monitoring system was installed on the A76 200 Bridge in New Cumnock (S-W Scotland) and has provided a continuous recording of the scour for nearly two years. The scour data registered after a peak flood event (validated against actual measurements of scour during a bridge inspection) show the potential of the technology in providing continuous scour measures, even during extreme flood events, thus avoiding the deployment of divers for underwater examination.

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Remote monitoring to predict bridge scour failure using Interferometric Synthetic Aperture Radar (InSAR) stacking techniques

Cited by 89 publications

References 23 publications

Pre-Collapse Space Geodetic Observations of Critical Infrastructure: The Morandi Bridge, Genoa, Italy

Pre-Collapse Space Geodetic Observations of Critical Infrastructure: The Morandi Bridge, Genoa, Italy

Long-Term Deflection Monitoring for Bridges Using X and C-Band Time-Series SAR Interferometry

Electromagnetic Sensors for Underwater Scour Monitoring

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