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2017 Retrieving Groundwater Depletion and Drought in the Tigris-Euphrates Basin Between 2003 and 2015​

发布时间:2017-11-07          来源:           浏览次数:

Nengfang Chao1,2, Zhicai Luo3,4, Zhengtao Wang4,5, and Taoyong Jin4,5

1 Corresponding author: MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China; fax: (86) 27 87542391; nfchao@hust.edu.cn
2 State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China, nfchao@hust.edu.cn
3 MOE Key Laboratory of Fundamental Physical Quantities Measurement, School of Physics, Huazhong University of Science
and Technology, Wuhan 430074, China, zcluo@hust.edu.cn
4 Collaborative Innovation Center of Geospatial Technology, Wuhan University, Wuhan, China, zcluo@hust.edu.cn, ztwang@whu.edu.cn, tyjin@sgg.whu.edu.cn
5 School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China, ztwang@whu.edu.cn, tyjin@sgg.whu.edu.cn 

Article impact statement: The water shortages and droughts in the Tigris-Euphrates Basin will be more and more severe from GRACE, altimetry, and hydrological data.
Received June 2017, accepted September 2017.

Quantitative estimates of the groundwater depletion and droughts in the Tigris-Euphrates Basin (TEB) can be useful for sustainably managing its water resources. Here, data from the Gravity Recovery and Climate Experiment (GRACE) satellite mission are used to infer the monthly changes in the total water storage of the TEB from January 2003 to December 2015. Additionally, the data of altimetry and output from land surface models are used to remove the contributions from lake water changes and other hydrological factors to obtain the total groundwater depletion (TGWD), human-driven groundwater depletion (HGWD), and climate-driven groundwater depletion. We conclude that an alarming rate of decrease in the total water storage and the loss of TGWD have an "accelerating" trend, as the trend during 2007 to 2015 was 3.6 times that during 2003 to 2006. Moreover, the HGWD is 116.09 Gt, which accounts for 98% of the TGWD. Finally, the total storage deficit index (TSDI) is derived from the GRACE data to characterize the drought of the TEB. The results show that TSDI agrees well with the actual drought rather than the Palmer drought severity index (PDSI) and that the TEB has been undergoing a severe drought since September 2007 according to both the TSDI and PDSI. The research in this study provides an effective and unique method for understanding the hydrological processes and sustainable use of water resources in regions or countries with little data, which is essential for more efficient, sustainable, and cross-boundary cooperative water resource management.




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