Investigating the Subsidence of Abbas Plain in Ilam during Two Periods of Groundwater Level Decline and Rise Using Radar Interferometry Technique

Document Type : Research paper

Authors

1 Ph.D. student in Geophysics, Department of Earth Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137–66731, Iran.

2 Associated Professor, Department of Earth Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137–66731, Iran.

10.22034/hydro.2024.59514.1309

Abstract

Dasht-e Abbas, situated in the Dehloran region of Ilam Province, is one of the few plains in Iran that experienced a severe groundwater decline (nearly 6 meters) during the declining period (1984 to 2005). However, due to water transfer from the Karkheh basin, the groundwater level has increased by approximately 18 meters during the rising period (2005 to 2021), surpassing the initial 1984 level by a significant margin of 12 meters. This unique hydrogeological condition provides an excellent opportunity to investigate subsidence recovery rates during the rising period using Interferometric Synthetic Aperture Radar (InSAR) technology. Processing Envisat satellite images revealed an average settlement rate of 7 mm/year between 2004 and 2006. Analyzing Sentinel satellite imagery for the period 2014 to 2019, which falls within the rising period, indicates that despite the substantial groundwater level rise, the subsidence rate has only decreased by about 3 mm/year. This suggests that complete subsidence recovery is not feasible, even with the return of water to a level exceeding the initial amount after more than a decade. Therefore, it is evident that a portion of the aquifer has undergone permanent consolidation and will not be fully recoverable. This study highlights that replenishing aquifer water deficit may not always stop subsidence, and a portion of the aquifer may undergo permanent consolidation and remain unrecoverable.Top of Form

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References

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Hydrogeology
Volume 8, Issue 2
Publisher
March 2024
Pages 158-169

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