Quantitative Assessment of Interferometric Synthetic Aperture Radar (INSAR) for Landslide Monitoring and Mitigation

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Geomorphic Risk Reduction Using Geospatial Methods and Tools

Part of the book series: Disaster Risk Reduction ((DRR))

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Abstract

This work focuses on understanding to what degree the remote sensing tool of Interferometric Synthetic Aperture Radar (InSAR) can be used to track sub-surface ground motion in deep-seated landslides. We also consider the uncertainties that may arise out of using a remote sensing tool to track ground motion, as opposed to traditional boreholes, and how InSAR can be used to understand this uncertainty. The landslide case study of interest in this work is the El-Forn landslide in Canilllo, Andorra. These objectives of this work will be completed by focusing on the utilization of available Sentinel-1 data. Sentinel-1 data was processed and were used to generate a stack of Sentinel-1 images using small temporal and spatial baseline subsets (SBAS), which relies on many SAR acquisitions and implements a combination of the multi-look interferograms computed from the original SAR acquisitions, generating mean deformation velocity maps and time series (Berardino et al., IEEE Trans Geosci Remote Sens 40:2375–2383, 2002; Handwerger et al., Sci Rep 9: 1–12, 2019; Yunjun et al., Comput Geosci 133:104–331, 2019). From there, the interferogram pairs were inverted with the Miami Insar Time series software in Python (MintPy), InSAR Scientific Computing Environment (ISCE), and Hyp3 toolboxes/open-repositories to create displacement time series (Yunjun et al., Comput Geosci 133:104–331, 2019) over the main scarp. The displacement time series from InSAR was compared to in-situ ground motion measurements, suggesting that InSAR-based displacement data can be used to track sub-surface ground motion trends. Similarly, InSAR was found to indicate extreme sub-surface events in ground motion time seriry kriging was used as a method of geospatial interpolation over the landslide in order to visualize the quantity of remote observations necessary to minimize error in scarp reconstruction, suggesting that around 20 total observations lowers the normalized root mean squared error for the geospatially interpolated reconstruciton of the El Forn landslide surface.

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Conflicts of Interest

The author(s) declare(s) that there is no conflict of interest regarding the publication of this article.

Funding

This work was supported by the National Science Foundation [CMMI grant numbers 2006150 and 2042325] and the Fulbright Open Study Award.

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R. Lau conceived, designed, and carried out the analysis, as well as wrote the entirety of the manuscript. C. Segui provided helpful information regarding geophysical modeling and geology of the El Forn landslide. T. Waterman provided helpful guidance in getting set up and troubleshooting working on the computing cluster. N. Chaney provided space on his lab’s computing cluster, as well as helpful guidance on spatial data analysis. A. Handwerger provided critical guidance on the use of InSAR, ISCE+, and MintPy for this work. M. Veveakis provided guidance and oversight throughout the entirety of the research process.

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Correspondence to Rachael Lau .

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All data used in the construction of the interferograms is publicly available on the Alaska Satellite Facility's Vertex Platform. The in-situ data is restricted based on an existing partnership with the government of Andorra, but is available upon request from the corresponding author.

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© 2024 The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

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Lau, R., Seguí, C., Waterman, T., Chaney, N., Veveakis, M. (2024). Quantitative Assessment of Interferometric Synthetic Aperture Radar (INSAR) for Landslide Monitoring and Mitigation. In: Sarkar, R., Saha, S., Adhikari, B.R., Shaw, R. (eds) Geomorphic Risk Reduction Using Geospatial Methods and Tools. Disaster Risk Reduction. Springer, Singapore. https://doi.org/10.1007/978-981-99-7707-9_9

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