Ground Surface Deformation Analysis Integrating InSAR and GPS Data in the Karstic Terrain of Cheria Basin, Algeria

Abstract

Karstic terrains are usually dominated by aquifer systems and/or underground cavities. Overexploitation of groundwater in such areas often induces land subsidence and sometimes
causes sinkholes. The Cheria basin in Algeria suffers from severe land subsidence issues, and this
phenomenon has been increasing in recent years due to population expansion and uncontrolled
groundwater exploitation. This work uses GPS data and persistent scatterer interferometry synthetic
aperture radar (PS-InSAR) techniques to monitor the land subsidence rate by employing Sentinel-
1 satellite data for the period from 2016 to 2022. Our results demonstrate that the Cheria basin
experiences both uplift and subsidence in places, with an overall substantial change in the land
surface. The total cumulative subsidence over 6 years reached a maximum of 500 mm. Comparison
of land deformation between PSI and GPS showed root mean square error (RMSE) values of about
2.83 mm/year, indicating that our analyzed results are satisfactorily reproducing the actual changes.
Nonetheless, these results can be used to extract the susceptible zones for vertical ground displacement and evaluate the surface deformation inventory map of the region for reducing damages (e.g.,
human losses, economic impact, and environmental degradation) that may occur in the future (e.g.,
sinkholes) and can be further utilized in perspective for a sinkhole early warning system.

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