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Groundwater Storage Change in the Jinsha River Basin from GRACE,Hydrologic Models,and In Situ Data |
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| Authors: | Nengfang Chao Gang Chen Jian Li Longwei Xiang Zhengtao Wang Kunjun Tian |
| Institution: | 1. Corresponding author: College of Marine Science and Technology, China University of Geosciences, 388 Lu Mo Road, Wuhan, 430074, People's Republic of China. chaonf@cug.edu.cn;2. Hubei Subsurface Multi-scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, 388 Lu Mo Road, Wuhan, 430074 People's Republic of China;3. State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, 340 Xu Dong Street, Wuhan, 430077 People's Republic of China
University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing, 100049 People's Republic of China;4. School of Geodesy and Geomatics, Wuhan University, 129 Luo Yu Road, Wuhan, 430079 People's Republic of China Collaborative Innovation Center of Geospatial Technology, Wuhan University, 129 Luo Yu Road, Wuhan, 430079 People's Republic of China |
| Abstract: | Groundwater plays a major role in the hydrological processes driven by climate change and human activities, particularly in upper mountainous basins. The Jinsha River Basin (JRB) is the uppermost region of the Yangtze River and the largest hydropower production region in China. With the construction of artificial cascade reservoirs increasing in this region, the annual and seasonal flows are changing and affecting the water cycles. Here, we first infer the groundwater storage changes (GWSC), accounting for sediment transport in JRB, by combining the Gravity Recovery and Climate Experiment mission, hydrologic models and in situ data. The results indicate: (1) the average estimation of the GWSC trend, accounting for sediment transport in JRB, is 0.76 ± 0.10 cm/year during the period 2003 to 2015, and the contribution of sediment transport accounts for 15%; (2) precipitation (P), evapotranspiration (ET), soil moisture change, GWSC, and land water storage changes (LWSC) show clear seasonal cycles; the interannual trends of LWSC and GWSC increase, but P, runoff (R), surface water storage change and SMC decrease, and ET remains basically unchanged; (3) the main contributor to the increase in LWSC in JRB is GWSC, and the increased GWSC may be dominated by human activities, such as cascade damming and climate variations (such as snow and glacier melt due to increased temperatures). This study can provide valuable information regarding JRB in China for understanding GWSC patterns and exploring their implications for regional water management. |
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