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Water 2018, 10(5), 669; https://doi.org/10.3390/w10050669

Assessing the Influence of the Three Gorges Dam on Hydrological Drought Using GRACE Data

1
School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
2
College of Marine Science and Technology, China University of Geosciences, Wuhan 430074, China
3
Faculty of Science, University of Alberta, Edmonton, AB T6G 2R3, Canada
*
Author to whom correspondence should be addressed.
Received: 17 April 2018 / Revised: 19 May 2018 / Accepted: 19 May 2018 / Published: 22 May 2018
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Abstract

With worldwide economic and social development, more dams are being constructed to meet the increasing demand for hydropower, which may considerably influence hydrological drought. Here, an index named the “Dam Influence Index” (DII) is proposed to assess the influence of the Three Gorges Dam (TGD) on hydrological drought in the Yangtze River Basin (YRB) in China. First, the total terrestrial water storage (TTWS) is derived from Gravity Recovery and Climate Experiment data. Then, the natural-driven terrestrial water storage (NTWS) is predicted from the soil moisture, precipitation, and temperature data based on an artificial neural network model. Finally, the DII is derived using the empirical (Kaplan-Meier) cumulative distribution function of the differences between the TTWS and the NTWS. The DIIs of the three sub-basins in the YRB were 1.38, −4.66, and −7.32 between 2003 and 2008, which indicated an increase in TTWS in the upper sub-basin and a reduction in the middle and lower sub-basins. According to the results, we concluded that impoundments of the TGD between 2003 and 2008 slightly alleviated the hydrological drought in the upper sub-basin and significantly aggravated the hydrological drought in the middle and lower sub-basins, which is consistent with the Palmer Drought Severity Index. This study provides a new perspective for estimating the effects of large-scale human activities on hydrological drought and a scientific decision-making basis for the managing water resources over the operation of the TGD. View Full-Text
Keywords: hydrological drought; Three Gorges Dam; GRACE hydrological drought; Three Gorges Dam; GRACE
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Li, F.; Wang, Z.; Chao, N.; Song, Q. Assessing the Influence of the Three Gorges Dam on Hydrological Drought Using GRACE Data. Water 2018, 10, 669.

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