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Studying subsidence in urban areas and its effect on transportation infrastructure using the method based on Persistent Scatterer.
Mohammad Reza Arjmandrad, Behzad Voosoghi, Zahra Ghorbani *
Abstract:   (92 Views)
In urban areas, deformation of transport and road infrastructure may lead to serious safety incidents. Therefore, management and monitoring are vital to ensure the quality of constructions and prevent transportation accidents, especially in areas with land subsidence such as Qom province. Low annual rainfall statistics, successive droughts and the type of soil in the region have caused this province, especially Qom city, to be among areas prone to land subsidence. The absence of a permanent geodynamic station in Qom's urban area, as well as the costly and time-consuming leveling operation, made radar interferometric technology to be chosen as one of the best methods for monitoring land deformation. In this study, the permanent scatterer interferometric synthetic aperture radar (PS-InSAR) technique has been used for infrastructure monitoring and inspection because it allows obtaining reliable results in the detection and prevention of infrastructure instabilities during time provides. For estimating land subsidence rate in the city of Qom, 29 descending radar images of the Sentinel-1 sensor were used during the period of January 2019 to November 2020. GMTSAR2StaMPS (G2S) software was used to process radar images and time series analysis. The results showed that southeastern area of Qom city has a subsidence rate of -54.5 mm/yr along the line of sight (LOS) of the satellite. The worrisome issue is the extension of land subsidence to the central area of the city and damage to important urban infrastructures, which should be taken into account in order to prevent this problem. The investigation of regional piezometers and Qom-Kahak hydrograph shows a drop of 1.8 meters in the water level between October 2017 and October 2021, which has caused subsidence of about -7.5 cm per year in the vertical direction in the southeast of Qom. Also, due to the good agreement of the results of radar interferometry and the drop of the underground level in the region, the excessive exploitation of underground water resources for agricultural purposes can be considered as the main reason for the subsidence in this area.
Article number: 8
Keywords: Subsidence, Qom, Interferometric radar, Sentinel-1, Underground water, Piezometers
Type of Study: Research | Subject: Geo&Hydro
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نشریه علمی علوم و فنون نقشه برداری Journal of Geomatics Science and Technology