Sentinel-1 Persistent Scatterer Interferometric Synthetic Aperture Radar (PS-InSAR) for Long-Term Remote Monitoring of Ground Subsidence: A Case Study of a Port in Busan, South Korea
- Year
- 2022
- Journal
- KSCE Journal of Civil Engineering
- volume
- 26(0)
- Page
- 4317-4329
- Author
- Ryan Angeles Ramirez; Kwon Tae-Hyuk
- status of publication
- 202210 Published
Abstract
Reclamation has allowed rapid land expansions for economic zones, residential areas,
airports, industrial parks, and seaports. Meanwhile, the reclaimed lands often pose a risk of
ground subsidence, jeopardizing functions of aboveground infrastructures, buildings, and
facilities and threatening human lives. Therefore, it is critical to systematically monitor and
manage the reclaimed lands after construction and minimize geohazard risks. This paper
presents a case study on long-term remote monitoring of ground subsidence in reclaimed land
using satellite synthetic aperture radar (SAR) data and the Persistent Scatterer Interferometric
SAR (PS-InSAR) technique. The case study explores the excessive and persistent ground
subsidence in Busan New Port, South Korea, which occurred since 2007. We employ large
stacks of Sentinel-1 data acquired from the ascending and descending tracks for reliable
estimation of ground subsidence and utilize the hyperbolic model, providing an updated
prediction tool. A benchmarking and media fact-checking approach consistently supports our
PS-InSAR analysis results. The time-series results show that the maximum subsidence rate is
approximately -85 mm/yr along the radar line-of-sight (LOS). PS-InSAR can assist in saving
expensive and laborious mapping and operational field-survey services and offers essential
guidance for the next phase of future construction of Busan New Port.
Keywords
Sentinel-1; PSrds-InSAR; Remote sensing; Long-term remote monitoring; Ground subsidence; Busan New Port;