Title:	Improving regional groundwater storage estimates from GRACE and global hydrological models over Tasmania, Australia
Authors:	Yin, Wenjie Li, Tongqing Zheng, Wei Hu, Litang Han, Shin-Chan Tangdamrongsub, Natthachet Šprlák, Michal Huang, Zhiyong
Citation:	YIN, W. ., LI, T. ., ZHENG, W. ., HU, L. ., HAN, S. ., TANGDAMRONGSUB, N. ., ŠPRLÁK, M. ., HUANG, Z. . Improving regional groundwater storage estimates from GRACE and global hydrological models over Tasmania, Australia. HYDROGEOLOGY JOURNAL, 2020, roč. 28, č. 5, s. 1809-1825. ISSN: 1431-2174
Issue Date:	2020
Publisher:	Springer
Document type:	článek article
URI:	2-s2.0-85084303485 http://hdl.handle.net/11025/39846
ISSN:	1431-2174
Keywords in different language:	groundwater storage;GRACE;hydrological models;Tasmania
Abstract in different language:	Accuracy of groundwater storage (GWS) estimates from the Gravity Recovery and Climate Experiment (GRACE) mission usually has certain relations with hydrological models. This study develops a statistical selection approach to optimally estimate GWS from GRACE using two hydrological models: the Global Land Data Assimilation System (GLDAS) and the WaterGAP Global Hydrology Model (WGHM), over Tasmania, Australia. This approach involves three variables: the long-term trend, Pearson correlation coefficient (PR), and root mean square error (RMSE). The results show that in-situ observations are highly correlated with GRACE-GLDAS (PR from 0.64 to 0.85) and GRACE-WGHM (PR from 0.69 to 0.88) in eastern and northern regions of Tasmania, respectively. The interannual trends of GRACE-GLDAS estimates are generally ~1.8 times larger than those from GRACE-WGHM solutions. With regard to the standard method, the statistical selection approach can effectively improve the PR and Nash-Sutcliffe efficiency index (NSE) by 3.80 and 1.38%, respectively, over the northern region, while it decreases the RMSE by 1.07%. Similar improvements can also be detected in the eastern region. In terms of spatial distribution, the statistical approach benefits from advantages of the different models, especially to preserve the characteristics of Central Highland. Overall, according to the models, Tasmania experienced a pronounced GWS decline during the Millennium Drought (2003–2010), at a depletion rate of –2.57 mm/year, mainly due to decreasing precipitation. The increasing precipitation infiltration after 2010 lead to the GWS recovery by 3.94 mm/year. The limitation of the method is that it depends on the availability of in-situ groundwater level data.
Rights:	Plný text je přístupný v rámci univerzity přihlášeným uživatelům. © Springer
Appears in Collections:	Články / Articles (NTIS) Články / Articles (KMA) Články / Articles (KGM) OBD

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