Time-Series Analysis of Dam Deformation Using Satellite-Based InSAR Technique: Case Studies from Oroville, Pong, and Tehri Dams

Efficient water management is vital for our society's sustainability, with dams playing a crucial role and posing safety risks. We employed satellite based LiCSBAS InSAR techniques to monitor the deformation of Oroville, Pong, and Tehri Dams. Oroville is known for its 2017 spillway failure. We monitored deformation from 2015 to 2022, revealed pre-failure signals at the Oroville dam, and validated with the actual failure timeline. Using two independent observations, our analysis found a total line-of-sight deformation of 6 mm. A significant finding is that the pre-dam failure deformation rate is six times higher than the post-dam failure period. This method's feasibility was confirmed for the Tehri and Pong dams, highlighting its potential to enhance dam safety and sustainable resource utilization.