Abstract
The recent dynamics of terrestrial water storage (TWS) and groundwater storage (GWS) fluctuations were investigated based on the Gravity Recovery And Climate Experiment (GRACE) observations over 25 basins of Türkiye. Coarse-resolution GRACE estimates were downscaled based on the Random Forest algorithm. The impacts of precipitation (P) and evapotranspiration (ET) on the variations of water storage were also assessed. The findings demonstrated good performance for the RF model in simulating finer resolution estimates of TWS. The results indicated a diminishing trend of TWS and its hydrologic components over all the basins from 2003 to 2020. The Doğu Akdeniz Basin with the annually decreasing TWS and GWS of \(1.15\ \mathrm{cm}/\mathrm{yr}\) and \(1.10\ \mathrm{cm}/\mathrm{yr}\) was the most critical basin of Türkiye. The least storage loss was observed in the Batı Karadeniz Basin with the annual TWS and GWS loss of \(0.38 \,\mathrm{cm}/\mathrm{yr}\) and \(0.45\,\mathrm{ cm}/\mathrm{yr}\), respectively. Based on the results, Türkiye has lost, on average, an estimated \(5.16\ \mathrm{km}^{3}/\mathrm{yr}\) and \(4.09\, {\mathrm{km}}^{3}/\mathrm{yr}\) of its TWS and GWS, respectively, which are equivalent to the total storage loss of \(92.88\, {\mathrm{km}}^{3}\) and \(73.62\, {\mathrm{km}}^{3}\) of TWS and GWS during the last 18 years. The results also indicated that P and ET interact differently with the variations of TWS and GWS. The net water flux was revealed to be partially correlated with the total water storage fluctuations, suggesting the governing role of other deriving forces particularly the anthropogenic factors in the spatiotemporal variations of Türkiye’s water storage; therefore, a sector-specific analysis of the water storage variations is crucial for the country, particularly by concentrating more on the dynamics of GWS.
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The data and codes that support the findings of this study are available upon a rational request from the corresponding author.
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Conceptualization: Behnam Khorrami and Orhan Gündüz. Methodology: Behnam Khorrami. Data Curation: Behnam Khorrami. Formal analysis: Behnam Khorrami. Writing: Behnam Khorrami. Editing: Behnam Khorrami and Orhan Gündüz.
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Highlights
• An alarming water storage depletion was detected in Türkiye over 2003–2020 period.
• Türkiye’s total and groundwater storage has been depleted by 5.16 km3/yr and 4.09 km3/yr, respectively.
• Snow water equivalent (SWE) appears to have a minor impact on the variations of water storage in Türkiye.
• The water storage variations in Türkiye can be ascribed to both natural and anthropogenic factors.
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Khorrami, B., Gündüz, O. Remote sensing-based monitoring and evaluation of the basin-wise dynamics of terrestrial water and groundwater storage fluctuations. Environ Monit Assess 195, 868 (2023). https://doi.org/10.1007/s10661-023-11480-7
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DOI: https://doi.org/10.1007/s10661-023-11480-7