ERS and Envisat multitemporal interferometric analysis to characterise land subsidence and uplift in Phoenix, Arizona
07 August 2015
In this study the team show the usefulness of InSAR for examining surface deformation due to groundwater withdrawal and recharge in Phoenix, Arizona. Multi-track ascending and descending ERS SAR datasets from 1992-1996 and Envisat ASAR, 2003-2010 are combined to obtain vertical and horizontal (east-west) displacement time series components.
The LOS time series of surface deformation are inverted to obtain spatiotemporal maps of the vertical and horizontal deformation fields. The analysis shows that the general deformation pattern is consistent among datasets and is characterised by three zones of subsidence and a broad zone of uplift. In situ independent hydraulic head data from observation wells were also provided by Arizona Department of Water Resources (ADWR) and are used in the validation and to form a time series at 33 locations in the Phoenix metropolitan area.