GPS measurement of land subsidence in Gandhinagar, Gujarat (Western India), due to groundwater depletion

摘要

A continuous GPS measurement site, ISRR, at Gandhinagar (Western India), documented similar to 5 mm/year of surface subsidence rate during 2009-2016. Preliminary modelling using an analytical solution indicates that the observed surface subsidence rate at the ISRR site is consistent with the ground water depletion reported from Gandhinagar. An assessment of data from GPS sites at Lucknow and Varanasi in the Indo-Gangetic plains in Northern India does not indicate any significant subsidence at these sites which is also consistent with the in situ observations of insignificant depletion of ground water in the region.