Estimation of subsidence using radar interferometry technique and groundwater parameters and land use (Case study: Pakdasht plain)

 One of the dangers that has occurred in many areas in recent years is the dangers of subsidence. Identifying areas prone to subsidence and estimating its rate plays an important role in managing and controlling this phenomenon. High-precision radar interferometry technique is one of the most suitable methods for detecting and measuring subsidence. This technique compares the phase taken from two radar datasets at two different times and, by creating an interrogram, is able to measure changes in the earth's surface over time. In this study, in order to identify and measure subsidence in Pakdasht plain, radar images of 2015 and 2020 have been used. SARSCAPE software has been used for information processing. In order to verify, the data of piezometric wells and land use maps in the area were used. According to the results, the maximum subsidence rate in 5 years in the region is estimated at 10 cm. The results also showed that the highest rate of subsidence in the period 2020 is in the next categories of agricultural uses with a value of 10 cm, rangeland area with a value of 9 cm and urban and soil uses with a value of 8 cm, respectively. have. Also, the relationship between subsidence and changes in groundwater level showed that in a period of 5 years, groundwater level has decreased by 12 meters, which has led to subsidence of land in the study area.