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Monitoring Roadbed Stability to Prevent Cascading Hazards in Daejeon City, South Korea, Using Sentinel-1 SAR Data

  • Manik DAS ADHIKARI (Department of Civil Engineering, Gangneung-Wonju National University) ;
  • Seung-Bin LEE (Department of Civil Engineering, Gangneung-Wonju National University) ;
  • Seong-Wuk KIM (Department of Civil Engineering, Gangneung-Wonju National University) ;
  • Hyeon-Jun KIM (Department of Civil Engineering, Gangneung-Wonju National University) ;
  • Jeremie TUGANISHURI (Department of Civil Engineering, Gangneung-Wonju National University) ;
  • Sang-Guk YUM (Department of Civil Engineering, Gangneung-Wonju National University) ;
  • Ji-Myong KIM (Department of Architectural Engineering, Mokpo National University)
  • Published : 2024.07.29

Abstract

Roadbed stability is paramount in urban areas as it directly affects public safety and city operations. South Korea's major metropolis has experienced 1127 cases of ground subsidence since 2014, affecting subways, roads, railways, and construction sites. Notably, about 40% of these incidents coincide with heavy summer rainfall, while 60% resulted from utility damage, improper backfill, and groundwater fluctuations. Subsequently, roadbed instability leads to a range of cascading hazards, including sinkholes and road failures, endangering public safety and the economy. Therefore, continuous monitoring of roadbed stability and implementing proactive measures are essential for a resilient transportation infrastructure. However, terrestrial in-situ observations like GPS provide accurate surface's displacement with high temporal accuracy but limited spatial resolution. To address this issue, we used the InSAR permanent scatterer (PSInSAR) technique to process 35 Sentinel-1 SLC datasets acquired between 2017 and 2022 to monitor and prevent cascading hazards in Daejeon City, South Korea. The results revealed an average subsidence rate of -0.88mm/year with a maximum of -7.73 mm/year. Notably, the southern part of the city exhibited significant roadbed instability, with an average and maximum cumulative subsidence of -5.13 mm and -44.95 mm, respectively. The deformation data was then integrated with road geometry to develop a vulnerability map of the city, highlighting the pronounced roadbed deformation in the southern region. Time-series subsidence variations correlated with groundwater fluctuations data from 2017 to 2022, showing a decline in groundwater levels from 4.63m to 9.9m in the southern region. Furthermore, a comparison between subsidence rates and effective shear wave velocity (Vs30) revealed that most subsidence events were associated with Vs30 values below 420 m/sec, indicating a clear lithological influence on the spatial distribution of roadbed instability. Thus, the integrated geotechnical and hydrogeological data with PSInSAR monitoring can better understand the processes responsible for roadbed instability in areas with small-scale variations.

Keywords

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education ((NRF-2021R1C1C2003316). The SARPROZ team is acknowledged (https://www.sarproz.com/) for providing the MT-InSAR processing program upon request. The authors would also acknowledge the European Space Agency (ESA) for providing satellite images free of charge.

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