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Remote Sens. 2018, 10(5), 674; https://doi.org/10.3390/rs10050674

Groundwater Storage Changes in China from Satellite Gravity: An Overview

1,*, 1,2, 1 and 3
1
State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China
2
Division of Geodetic Science, School of Earth Sciences, Ohio State University, Columbus, OH 43210, USA
3
State Key Laboratory of Urban Environmental Processes and Digital Modeling, Capital Normal University, Beijing 100048, China
*
Author to whom correspondence should be addressed.
Received: 19 March 2018 / Revised: 24 April 2018 / Accepted: 24 April 2018 / Published: 26 April 2018
(This article belongs to the Special Issue Remote Sensing of Groundwater from River Basin to Global Scales)
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Abstract

Groundwater plays a critical role in the global water cycle and is the drinking source for almost half of the world’s population. However, exact quantification of its storage change remains elusive due primarily to limited ground observations in space and time. The Gravity Recovery and Climate Experiment (GRACE) twin-satellite data have provided global observations of water storage variations at monthly sampling for over a decade and a half, and is enable to estimate changes in groundwater storage (GWS) after removing other water storage components using auxiliary datasets and models. In this paper, we present an overview of GWS changes in three main aquifers within China using GRACE data, and conduct a comprehensive accuracy assessment using in situ ground well observations and hydrological models. GRACE detects a significant GWS depletion rate of 7.2 ± 1.1 km3/yr in the North China Plain (NCP) during 2002–2014, consistent with ground well observations and model predictions. The Liaohe River Basin (LRB) experienced a pronounced GWS decline during 2005–2009, at a depletion rate of 5.0 ± 1.2 km3/yr. Since 2010, GRACE-based GWS reveal a slow recovery in the LRB, with excellent agreement with ground well observations. For the whole study period 2002–2014, no significant long-term GWS depletion is found in the LRB nor in the Tarim Basin. A case study in the Inner Tibetan Plateau highlights there still exist large uncertainties in GRACE-based GWS change estimates. View Full-Text
Keywords: GRACE; groundwater storage; satellite gravimetry; China; hydrological model; groundwater level; North China Plain GRACE; groundwater storage; satellite gravimetry; China; hydrological model; groundwater level; North China Plain
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Feng, W.; Shum, C.K.; Zhong, M.; Pan, Y. Groundwater Storage Changes in China from Satellite Gravity: An Overview. Remote Sens. 2018, 10, 674.

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