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Spatiotemporal analysis of GRACE-based groundwater storage variation in North China Plain |
Qiuyan SHU1,2( ), Yun PAN1,2, Huili GONG1,2, Zhiyong HUANG1,2, Longqun ZHENG1,2 |
1.College of Resource and Environment and Tourism, Capital Normal University, Beijing 100048, China 2.Base of the State Key Laboratory of Urban Environmental Process and Digital Modeling,Capital Normal University, Beijing 100048, China |
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Abstract GWSA (groundwater storage anomaly) data of North China Plain from 2003 to 2015 were estimated from terrestrial water storage change (TWSC) data retrieved by monthly GRACE (gravity recovery and climate experiment). The EOF (empirical orthogonal function) method was applied to analyzing the GWSA, and it is shown that cumulative contribution rate of the first three EOF modes reached up to 96.35%. The explanation rate of the total variance of first mode reached about 80%. It is shown that GWSA in the North China Plain behaved consistently descending in the whole region with obvious seasonal fluctuations, caused by groundwater exploitation and precipitation. The second and third mode, with an explanation rate of about 12% and 5%, showed that spatial pattern in northeast-southwest direction and that in northwest-southeast direction were obviously opposite. However, no significant temporal diversification was found, presumably mainly controlled by water cycle under the coastal-inland, piedmont-plain and hydrogeological conditions. This study helps to further understand the spatiotemporal characteristics and drive mechanism of groundwater change in North China Plain.
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Keywords
ground water storage variations
North China Plain
GRACE
EOF
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Issue Date: 30 May 2018
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