Characterization of changes in groundwater storage in the Lachlan Catchment, Australia, derived from observations of surface deformation and groundwater level data
Article
Article Title | Characterization of changes in groundwater storage in the Lachlan Catchment, Australia, derived from observations of surface deformation and groundwater level data |
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ERA Journal ID | 210884 |
Article Category | Article |
Authors | Razeghi, Mahdiyeh, Tregoning, Paul, Shirzaei, Manoochehr, Ghobadi-Far, Khosro, McClusky, Simon and Renzullo, Luigi |
Journal Title | Journal of Geophysical Research: Solid Earth |
Journal Citation | 127 (12) |
Number of Pages | 24 |
Year | 2022 |
Publisher | John Wiley & Sons |
Place of Publication | United States |
ISSN | 2169-9313 |
2169-9356 | |
Digital Object Identifier (DOI) | https://doi.org/10.1029/2022JB024669 |
Web Address (URL) | https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JB024669 |
Abstract | Global Positioning System (GPS) deformation measurements were combined with groundwater level data to examine the spatiotemporal variability of groundwater storage in the Lachlan catchment located in central New South Wales (Australia). After correcting for effects of glacial isostatic adjustment, non-tidal oceanic and atmospheric loading as well as hydrologic loading using existing models, we show that the seasonal and interannual variability of ground deformation and hydraulic head level data, extracted using wavelet time-frequency analysis, exhibits an in-phase behavior, indicating that the observed surface deformation is the poroelastic response to groundwater pressure change in aquifer system. Combination of GPS displacement and groundwater level change enables the estimation of elastic skeletal specific storage coefficients, which were then used for estimating groundwater storage changes. The estimated groundwater storage changes clearly reflect the four climate events of the Lachlan catchment since 1996: (a) the Millennium drought over 1996–2009, (b) the 2011–2012 La Nina and two significant floods in 2012 and 2016, (c) the drought conditions from mid-2017 to late-2019, and (d) the return of La Nina conditions since early 2020. We also found annual and long-term groundwater storage variations of respectively urn:x-wiley:21699313:media:jgrb55985:jgrb55985-math-0001 and urn:x-wiley:21699313:media:jgrb55985:jgrb55985-math-0002 over the period 2012–2021. Moreover, we show that groundwater level fluctuations can be predicted from GPS displacement measurements and storage coefficients with sufficient accuracy (80% correlation and 70% RMS reduction when compared in terms of seasonal cycle). This study provides essential information that can contribute to future groundwater planning, management, and control over the Australian continent. |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 370402. Earth and space science informatics |
Byline Affiliations | Australian National University |
Virginia Tech, United States | |
Geoscience Australia |
https://research.usq.edu.au/item/zw972/characterization-of-changes-in-groundwater-storage-in-the-lachlan-catchment-australia-derived-from-observations-of-surface-deformation-and-groundwater-level-data
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JGR Solid Earth - 2022 - Razeghi - Characterization of Changes in Groundwater Storage in the Lachlan Catchment Australia .pdf | ||
License: CC BY 4.0 | ||
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