![]() ![]() ![]() Long-term, decreasing, complex, non-linear patterns in the spatial and temporal domains from both InSAR and GRACE datasets were observed. The groundwater quantity variation and resulting land deformation for London using InSAR and Gravity Recovery and Climate Experiment (GRACE) between 2002-2010 were analysed. This thesis explores the suitability of Persistent Scatterer Interferometric Synthetic Aperture Radar (PSInSAR) to measure land deformation and different senor-software for InSAR processing. Groundwater-induced land movement can cause damage to property and resources, and hence it must be monitored for the safety and economics of a city. The over-extraction or rebound of groundwater can lead to land deformation because of the change in effective stress of underground sediments. This thesis aims to monitor spatio-temporal changes in groundwater and related phenomena (like land subsidence) using geospatial techniques like InSAR, GRACE, GIS, data analysis and data visualisation. Groundwater monitoring based on validated data can provide information that can guide decision making to decrease groundwater stress on local and global scales. ![]() This trend must be reversed to sustain the critical role of groundwater. The ever-increasing dependence on groundwater has led to its depletion across various parts of the world. About half of domestic human water consumption in urban areas is from groundwater. With the advent of efficient pumps and rural electrification, global groundwater extraction increased from 312 km3/year in the 1960s to 800 km3/year in 2000s approximately 70% of this extraction is used for agriculture. Groundwater contributes a significant proportion of the earth’s freshwater and is essential to sustain life on earth, but its availability in spatial and temporal dimensions is not uniform. ![]()
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