1:45 PM - 2:00 PM
[J04-7-02] Dynamic of aquifer compaction: Insight from continental-scale Sentinel-1 InSAR survey
Overextraction of groundwater for decades has caused high rates of land subsidence in many plain aquifers of Iran. Geodetic measurements have been used in the past to study this problem in some of the major basins in Iran. Among them, Interferometric Synthetic Aperture RADAR (InSAR) has proven a powerful tool to obtain a regional overview of the extent and rate of displacement in a large scale. However, because the availability of regular SAR data acquisition was limited in the past, these studies are limited to some major plain aquifers.
After the launch of Sentinel-1, it is now possible to acquire SAR data regularly with large spatial coverage all over the world, providing the opportunity to produce displacement maps in continental scales. The purpose of this paper is to analyze elastic and inelastic deformation behavior of developed groundwater basins using large-scale Sentinel-1 InSAR. Using more than two years of data available in the archive of Sentinel-1 cyclic elastic deformations and continuous inelastic deformations induced by groundwater withdrawal are separated and the ratio between them is estimated for several aquifers. Moreover, the ratio between vertical and horizontal displacement is evaluated by decomposition of displacement maps derived from different look angles. Our results exhibit significant inelastic deformation behavior in major aquifers of Iran, which makes groundwater remediation measures a challenging task for depleted aquifers.
After the launch of Sentinel-1, it is now possible to acquire SAR data regularly with large spatial coverage all over the world, providing the opportunity to produce displacement maps in continental scales. The purpose of this paper is to analyze elastic and inelastic deformation behavior of developed groundwater basins using large-scale Sentinel-1 InSAR. Using more than two years of data available in the archive of Sentinel-1 cyclic elastic deformations and continuous inelastic deformations induced by groundwater withdrawal are separated and the ratio between them is estimated for several aquifers. Moreover, the ratio between vertical and horizontal displacement is evaluated by decomposition of displacement maps derived from different look angles. Our results exhibit significant inelastic deformation behavior in major aquifers of Iran, which makes groundwater remediation measures a challenging task for depleted aquifers.