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Remote Sensing Techniques for Bridge Deformation Monitoring at Millimetric Scale: Investigating the Potential of Satellite Radar Interferometry, Airborne Laser Scanning and Ground-Based Mobile Laser Scanning

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Abstract

In light of ageing infrastructure, structural condition assessment is a key prerequisite for the provision of reliable, safe and performant infrastructure networks. However, full systematic condition inspections across large transport networks are extremely resource intensive. Thus, network-wide continuous structural monitoring is hardly feasible using classical engineering assessment methods. Modern remote sensing techniques open up new possibilities for infrastructure assessment and monitoring. Three different methods for rapid, contactless and non-invasive infrastructure deformation monitoring are evaluated: (1) satellite radar interferometry (InSAR), (2) airborne laser scanning (ALS) using unmanned aerial vehicles (UAV) and (3) vehicle-mounted mobile laser scanning (MLS). All methods are tested at an integral concrete bridge in Vienna, Austria, and results are contrasted to reference measurements available from several water-level gauges. In addition, thermal deformation is modelled based on the prevailing environmental conditions. Results show that all methods are well capable of detecting general deformation trends, albeit exhibiting different stages of maturity. While the main application of InSAR lies in long-term continuous deformation measurement of the overall structure, MLS and ALS have the benefit of providing a wealth of data through measurement campaigns. All three contactless measurement methods are suitable for supplementing current structural condition assessments.

Zusammenfassung

Fernerkundungstechniken für die Überwachung von Brückenverformungen im Millimeterbereich. Angesichts alternder Infrastruktur stellt die Zustandserfassung von Ingenieurtragwerken eine wichtige Voraussetzung für die Bereitstellung zuverlässiger, sicherer und leistungsfähiger Infrastrukturnetze dar. Vollständige systematische Inspektionen in großen Verkehrsnetzen sind jedoch äußerst ressourcenintensiv. Daher ist eine netzweite, kontinuierliche Bauwerksüberwachung mit klassischen Bewertungsmethoden kaum machbar. Moderne Fernerkundungstechniken eröffnen neue Möglichkeiten für die Bewertung und das Monitoring von Tragwerken. Drei verschiedene Methoden zum schnellen, berührungslosen und nicht-invasiven Deformationsmonitoring werden bewertet: (1) Satelliten-Radarinterferometrie (InSAR), (2) Airborne Laser Scanning (ALS) mit unbemannten Luftfahrzeugen (UAV) und (3) fahrzeuggestütztes mobiles Laserscanning (MLS). Alle Methoden werden an einer integralen Betonbrücke in Wien getestet, und mit Referenzmessungen eines Schlauchwaagensystems verglichen. Zusätzlich wird die thermische Verformung der Brücke unter Berücksichtigung der vorherrschenden Umweltbedingungen modelliert. Die Ergebnisse zeigen, dass alle Methoden trotz unterschiedlichen Genauigkeitspotentials gut in der Lage sind, allgemeine Verformungstrends zu erkennen. Während die Hauptanwendung von InSAR im langfristigen, kontinuierlichen Deformationsmonitoring der Gesamtstruktur liegt, haben MLS und ALS den Vorteil, im Rahmen von Messkampagnen umfassende Daten über den Zustand des Bauwerks bzw. der Fahrbahnoberfläche zu liefern. Alle drei Fernerkundungsmethoden eignen sich daher gut als Ergänzung der aktuellen Zustandsbewertung.

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Data and Code Availability

Sentinel-1 data are freely accessible online, e.g. through the Copernicus Open Access Hub (https://scihub.copernicus.eu/) or via the Alaska Satellite Facility (https://asf.alaska.edu/). A supplementary animation showing vertical bridge deformation of Seitenhafenbrücke (Vienna, Austria) based on Sentinel-1 InSAR (PSI) and in-situ measurements is available on Figshare at https://doi.org/10.6084/m9.figshare.20035364.

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Acknowledgements

The authors would like to acknowledge the Austrian Research Promotion Agency FFG for financial support through the project VerBewIng (FFG 871524: ‘Deformation-based Assessment of Engineering Structures’). Visualisations were created using ggplot2 (Wickham 2016) and QGIS 3.24 (QGIS Association 2022).

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Contributions

MS: conceptionalisation of the study, draft manuscript creation, InSAR analysis, visualisation; PD: UAV-ALS analysis; MK: thermal deformation modelling, FE modelling; MR: MLS analysis; RS: MLS analysis. All authors were jointly involved in discussing the results as well as writing the manuscript.

Corresponding author

Correspondence to Matthias Schlögl.

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The authors declare that they have no conflict of interest.

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Schlögl, M., Dorninger, P., Kwapisz, M. et al. Remote Sensing Techniques for Bridge Deformation Monitoring at Millimetric Scale: Investigating the Potential of Satellite Radar Interferometry, Airborne Laser Scanning and Ground-Based Mobile Laser Scanning. PFG 90, 391–411 (2022). https://doi.org/10.1007/s41064-022-00210-2

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  • DOI: https://doi.org/10.1007/s41064-022-00210-2

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