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Research Article

Damage Proxy Map over Collapsed Structure in Ansan Using COSMO-SkyMed Data
Arip Syaripudin Nur1
,
Muhammad Fulki Fadhillah1
,
Young-Hoon Jung2
,
Boo Hyun Nam2
,
Yong Je Kim3
,
Yu-Chul Park4
,
Chang-Wook Lee5*
1Combined M.S./Ph.D. Student, Division of Science Education, Kangwon National University
2Associate Professor, Department of Civil Engineering, Kyung Hee University
3Assistant Professor, Department of Civil and Environmental Engineering, Lamar University
4Associate Professor, Department of Geophysics, Kangwon National University
5Professor, Division of Science Education, Kangwon National University
*Corresponding Author
30 September 2022. pp. 363-376
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Abstract

An area under construction for a living facility collapsed around 12:48 KST on 13 January 2021 in Sa-dong, Ansan-si, Gyeonggi-do. There were no casualties due to the rapid evacuation measure, but part of the temporary retaining facility collapsed, and several cracks occurred in the adjacent road on the south side. This study used the potential of synthetic aperture radar (SAR) satellite for surface property changes that lies in backscattering characteristic to map the collapsed structure. The interferometric SAR technique can make a direct measurement of the decorrelation among different acquisition dates by integrating both amplitude and phase information. The damage proxy map (DPM) technique has been employed using four high-resolution Constellation of Small Satellites for Mediterranean basin Observation (COSMO-SkyMed) data spanning from 2020 to 2021 during ascending observation to analyze the collapse of the construction. DPM relies on the difference of pre- and co-event interferometric coherences to depict anomalous changes that indicate collapsed structure in the study area. The DPMs were displayed in a color scale that indicates an increasingly more significant ground surface change in the area covered by the pixels, depicting the collapsed structure. Therefore, the DPM technique with SAR data can be used for damage assessment with accurate and comprehensive detection after an event. In addition, we classify the amplitude information using support vector machine (SVM) and maximum likelihood classification algorithms. An investigation committee was formed to determine the cause of the collapse of the retaining wall and to suggest technical and institutional measures and alternatives to prevent similar incidents from reoccurring. The report from the committee revealed that the incident was caused by a combination of factors that were not carried out properly.

Keywords
collapsed structure
Ansan
damage proxy map
COSMO-SkyMed
interferometric coherence
classification
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 32
  • No :3
  • Pages :363-376
  • Received Date : 2022-09-23
  • Accepted Date : 2022-09-26
  • DOI :https://doi.org/10.9720/kseg.2022.3.363
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