Estimation of land subsidence using DInSAR and SBAS techniques

Abstract

Land subsidence is one of the few environmental hazards that has received much less attention than other hazards due to low human casualties. However, subsidence over time causes irreparable damage to cities and adjacent areas and facilities, and infrastructure. In the present research, land subsidence in Isfahan province in Iran and specifically in the area of Mobarakeh Steel Company (MSC) using the traditional interferometric method by two images related to the years 2016 and 2021 and time series analysis using the SBAS method by 621 Interferometer and 178 epochs and 159 Sentinel satellite images were used in the ascending direction. The maximum subsidence rate was about -83 mm per year and -28 cm in 5 years for Isfahan City, after processing with time series and traditional interferometric method, respectively. The results of the two methods were close to each other, which can confirm the correctness of the estimated subsidence. Also, the obtained maps were matched with the subsidence maps of the National Cartographic Center of Iran, and it was found that the land subsidence areas are located in the two hotspots of Isfahan and Mahyar plains. Subsidence has expanded in a trend of Isfahan, Shahreza, and Mobarakeh, Iran.