Long-term groundwater storage change in Victoria, Australia from satellite gravity and in situ observations

Abstract Analysis based on satellite gravity measurements from the Gravity Recovery and Climate Experiment (GRACE) and land surface models indicates that groundwater storage in Victoria, Australia had been declining steadily, until a trend reversal around early 2010, attributed to two wetter seasons in 2010 and 2011. In situ groundwater level measurements (from a network of 1395 bores in Victoria) also indicate a steady groundwater depletion since the early 1990's, and show remarkable agreement with GRACE estimates for the 10-year period (2003–2012) in common with the GRACE mission. Groundwater depletion rates for 2005 to 2009 are relatively large as indicated by both GRACE estimates (8.0 ± 1.7 km 3 /yr) and in situ measurements (8.3 ± 3.4 km 3 /yr). Over the same period (2005–2009), GRACE measurements capture significant groundwater depletion in a wider region covering much of the southern Murray-Darling Basin, and the total groundwater depletion rate in this region is about 17.2 ± 4.7 km 3 /yr. Annual groundwater storage changes are strongly correlated with precipitation anomalies, but only about one-fifth of anomalous precipitation contributes to groundwater recharge. The strong correlation suggests that this groundwater depletion is primarily related to drought with related groundwater pumping for agricultural and domestic consumption. The remarkable agreement between GRACE estimates and in situ measurements demonstrates the great potential of satellite gravity observations in combination with land surface model estimates to quantify changes in regional groundwater resources, especially when in situ measurements are limited or unavailable. This study shows the importance of reducing leakage bias in GRACE observations and the effectiveness of the forward modeling iterative method used.

[1]  D. Benson,et al.  Particle tracking and the diffusion‐reaction equation , 2013 .

[2]  J. Famiglietti,et al.  Satellite-based estimates of groundwater depletion in India , 2009, Nature.

[3]  David T. Bolvin,et al.  Improving the global precipitation record: GPCP Version 2.1 , 2009 .

[4]  Albert I. J. M. van Dijk,et al.  A review of historic and future hydrological changes in the Murray-Darling Basin , 2012 .

[5]  Jeffrey P. Walker,et al.  THE GLOBAL LAND DATA ASSIMILATION SYSTEM , 2004 .

[6]  S. Swenson,et al.  Post‐processing removal of correlated errors in GRACE data , 2006 .

[7]  Zhou Yong,et al.  Monte Carlo Simulation Tests of Correlation Significance Levels , 1999 .

[8]  S. Swenson,et al.  Estimating the human contribution to groundwater depletion in the Middle East, from GRACE data, land surface models, and well observations , 2014 .

[9]  B. Timbal,et al.  The Millennium Drought in southeast Australia (2001–2009): Natural and human causes and implications for water resources, ecosystems, economy, and society , 2013 .

[10]  J. Awange,et al.  Relation between GRACE-derived surface mass variations and precipitation over Australia , 2010 .

[11]  P. Tregoning,et al.  Assessment of GRACE satellites for groundwater estimation in Australia , 2012 .

[12]  Scott B. Luthcke,et al.  FAST TRACK PAPER: Tide model errors and GRACE gravimetry: towards a more realistic assessment , 2006 .

[13]  Byron D. Tapley,et al.  Contribution of ice sheet and mountain glacier melt to recent sea level rise , 2013 .

[14]  Matthew Rodell,et al.  Groundwater depletion in the Middle East from GRACE with implications for transboundary water management in the Tigris-Euphrates-Western Iran region , 2013, Water resources research.

[15]  S. Swenson,et al.  Satellites measure recent rates of groundwater depletion in California's Central Valley , 2011 .

[16]  J. Wahr,et al.  Computations of the viscoelastic response of a 3-D compressible Earth to surface loading: an application to Glacial Isostatic Adjustment in Antarctica and Canada , 2012 .

[17]  Guillaume Ramillien,et al.  Basin‐scale, integrated observations of the early 21st century multiyear drought in southeast Australia , 2009 .

[18]  Joseph L. Awange,et al.  Independent patterns of water mass anomalies over Australia from satellite data and models , 2012 .

[19]  M. Watkins,et al.  The gravity recovery and climate experiment: Mission overview and early results , 2004 .

[20]  W. Feng,et al.  Evaluation of groundwater depletion in North China using the Gravity Recovery and Climate Experiment (GRACE) data and ground‐based measurements , 2013 .

[21]  Zizhan Zhang,et al.  Reducing leakage error in GRACE-observed long-term ice mass change: a case study in West Antarctica , 2015, Journal of Geodesy.

[22]  F. Bryan,et al.  Time variability of the Earth's gravity field: Hydrological and oceanic effects and their possible detection using GRACE , 1998 .

[23]  Victor Zlotnicki,et al.  Time‐variable gravity from GRACE: First results , 2004 .

[24]  J. Janowiak,et al.  The Version 2 Global Precipitation Climatology Project (GPCP) Monthly Precipitation Analysis (1979-Present) , 2003 .

[25]  D. Chambers,et al.  Estimating Geocenter Variations from a Combination of GRACE and Ocean Model Output , 2008 .

[26]  J. Awange,et al.  On the suitability of the 4° × 4° GRACE mascon solutions for remote sensing Australian hydrology , 2011 .

[27]  V. M. Tiwari,et al.  Dwindling groundwater resources in northern India, from satellite gravity observations , 2009 .

[28]  A. Cazenave,et al.  Using GRACE to detect Groundwater Storage variations: the cases of Canning Basin and Guarani Aquifer System , 2012 .

[29]  Zizhan Zhang,et al.  Long-Term Groundwater Variations in Northwest India From Satellite Gravity Measurements , 2014 .

[30]  Bruno Merz,et al.  A global analysis of temporal and spatial variations in continental water storage , 2007 .

[31]  R. Reedy,et al.  Groundwater depletion and sustainability of irrigation in the US High Plains and Central Valley , 2012, Proceedings of the National Academy of Sciences.

[32]  Gurudeo Anand Tularam,et al.  LONG TERM CONSEQUENCES OF GROUNDWATER PUMPING IN AUSTRALIA: A REVIEW OF IMPACTS AROUND THE GLOBE , 2009 .

[33]  Neville Nicholls,et al.  An extended high-quality historical rainfall dataset for Australia , 1997 .

[34]  P. Döll,et al.  A global hydrological model for deriving water availability indicators: model tuning and validation , 2003 .

[35]  W. Keller,et al.  GRACE hydrological monitoring of Australia: Current limitations and future prospects , 2009 .