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http://dx.doi.org/10.7780/kjrs.2021.37.6.1.11

Observation of Ground Subsidence in Bangkok, Thailand Using PSInSAR Technique  

Jeon, Woohyun (Research Institute, SELab Inc.)
Yi, Jonghyuk (SELab Inc.)
Publication Information
Korean Journal of Remote Sensing / v.37, no.6_1, 2021 , pp. 1625-1630 More about this Journal
Abstract
In Bangkok, Thailand, there is an increasing concern for ground subsidence with the rapid urbanization. Given the presence of flood vulnerability due to the flat low-lying topography and proximity to the river delta, it is particularly significant to monitor deformation that can potentially augment flood hazards. In this paper, we have applied persistent scatterer interferometric synthetic aperture radar (PSInSAR) technique to investigate subsidence in Bangkok with the use of Sentinel-1 acquisitions spanning from June 2018 to October 2021. The vertical displacement velocity obtained from both ascending and descending orbits revealed regional-scale subsidence at rates up to 30 mm/yr. In addition, ongoing subsidence was observed in the suburb areas with the localized vertical subsidence exceeding 80 mm. The areas are primarily industrial and agricultural sectors, thus, the ground subsidence detected is probably caused by groundwater withdrawal. However, further work is needed to diagnose the trends of aquifer resources.
Keywords
PSInSAR; Sentinel-1; Subsidence; Bangkok;
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