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Conference Paper

InSAR Analysis of Groundwater Dynamics and Aquifer Parameters in Delhi, India

Authors

Guiney,  Rebecca
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Thomas,  Brian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Clarke,  Peter
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Spatar,  Ciprian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Grebby,  Stephen
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

O'Donnell,  Greg
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Guiney, R., Thomas, B., Clarke, P., Spatar, C., Grebby, S., O'Donnell, G. (2023): InSAR Analysis of Groundwater Dynamics and Aquifer Parameters in Delhi, India, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2719


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019172
Abstract
Traditional methods for evaluating groundwater resources rely on in-situ observations, which are often limited due to sparsely distributed monitoring wells and temporal inconsistencies in measurements. However, InSAR techniques have the potential to measure groundwater storage change indirectly through measuring ground deformation. The ground deformation associated with groundwater withdrawal is mainly recoverable or as a result of elastic compression. However, when effective stress exceeds the maximum past stress on the aquifer, inelastic subsidence occurs, which can permanently lower the storage capacity of the aquifer. Thus, in addition to monitoring changes in the volume of groundwater storage, analysing elasticity properties is necessary to fully understand the influence of overextraction on long-term aquifer sustainability. This research aims to investigate the capability of InSAR to contribute to a detailed understanding of groundwater storage change and the sustainability of groundwater use across Delhi, India. Specifically, we apply the ISBAS-InSAR technique to Sentinel-1 SAR data to produce a time-series of deformation across the region and investigate the relationship between in-situ groundwater storage change and ground deformation. Finally, the spatio-temporal variability and trends of elasticity in the underlying aquifer system, quantified using the elastic skeletal storage coefficient, will be analysed by examining the ratio of seasonal deformation signal provided by InSAR and groundwater level change from well measurements across the time-series of observations. These results shall inform both groundwater management in the Delhi region and provide insights into the applicability of InSAR for inferring large-scale aquifer dynamics.