Inversion of groundwater reserves changes in Queensland by GRACE

Queensland is the second largest state in Australia. Monitoring and analysis of changes in groundwater reserves in this region this of great practical significance to the formulation of local ecological environment and water management policies, The time-varying gravity field model from gravity recovery and climate experiment (GRACE) issued by the University of texas center for space research (CSR) and the global land data assimilation system (GLDAS) surface assimilation model are used to monitor and analyze the temporal and spatial changes of groundwater reserves in Queensland, which are then verifled and analyzed with measured well data and global precipitation climatology project (GPCP) rainfall data. The research results show that the groundwater increassd at a rate of 1.3±0.09 cm/a in Queensland was approximately in 2003 to 2015. There is also a significant spatial difference between the east and the west. The comparison with the GPCP rainfall data shows that the rainfall is the main factor affecting the change of groundwater reserves, The comparison with the measured data of the water well reveals that the change trend of the underground inversion result is basically consistent with that of the water level of the well.