Surface subsidence over a large structure using SBAS-InSAR with ALOS-۲ PALSAR-۲ data: The case of Mosul Dam, Iraq

Water conservation and efficient utilization are critical in water-scarce and arid regions such as Iraq. Dams, as vital infrastructure, play a significant role in meeting diverse needs, including water supply, flood control, and maintaining environmental flows. However, improper management of dams can lead to adverse effects on both human populations and ecosystems, disrupt water systems and habitats, and degrade water quality. Addressing these challenges, this study employs the Small Baseline Subset (SBAS) technique, a modern Synthetic Aperture Radar Interferometry (InSAR) method, to analyze displacement rates at Mosul Dam in Iraq. Using ۲۱ ALOS-۲ PALSAR-۲ L-band radar images, we observed that the central section of the dam is most susceptible to subsidence, while the sides experience less deformation. The average subsidence rate was found to be −۲.۲۱ mm/year, with an average cumulative subsidence of −۷.۱۸ mm over the study period. The maximum subsidence recorded was −۵۱.۷۰ mm, and the maximum uplift was ۳۰ mm. These findings are based on data collected between November ۲۳, ۲۰۱۴, and March ۱۷, ۲۰۲۴, providing valuable insights into the dam's structural behavior and informing future management strategies.

کلیدواژه ها:

InSAR ، ALOS-۲ PALSAR-۲ ، Subsidence ، SBAS ، Mosul Dam