Analysis of terrestrial water storage variations in Chinese mainland based on HUST-Grace2020 model

doi:10.11947/j.AGCS.2023.20210693

Abstract

Abstract: The characteristics of Chinese water resources are presented less per capita and unbalanced distribution. Therefore, it's significant to manage and regulate water based on water storage variation in Chinese mainland. Based on the latest HUST-Grace2020 model released by Huazhong University of Science and Technology, we analyze the terrestrial water storage (TWS) variations of Chinese mainland during January 2003 to July 2016. In addition, we calculate the TWS variations of the newest COST-G model released by the University of Berne in Switzerland, the CSR RL06 model released by Center of Space Research (CSR), the ITSG-Grace2018 model released by Institute of Geodesy at Graz University of Technology (ITSG) and the Tongji-Grace2018 model released by Tongji University during the same time frame. The results are summarized as follows: ①There is a good agreement between the results derived from HUST-Grace2020 and COST-G, ITSG-Grace2018, Tongji-Grace2018 in terms of the TWSs over 15 river basins in Chinese mainland. ②The water storage of Brahmaputra River and Lancang-Nu Rivers which located at the border of southwestern China varies most significantly. The annual amplitudes of these two regions are 13.75 and 9.37 cm, respectively. The positive TWS yearly trends are observed Yangtze River, Zhujiang River and the southeastern coast, which are 0.54, 0.78, 0.70 cm/a, respectively. In contrast, the TWSs of Huaihe River, Haihe River and Brahmaputra River show decreasing trend, with rates of -0.47, -0.88 and -1.30 cm/a, respectively. ③The TWS variations over Chinese mainland show obvious seasonal characteristics. Generally, the water storages are abundant in summer and autumn, but scarce in winter and spring. ④Based on the analysis of TWS in typical basins, extreme drought events of the Yangtze River Basin occurred in 2006 and 2011, and flood events occurred in 2010 and 2016. In the Yellow River, extreme drought events occurred in 2003 and flood events occurred in 2013.

Key words: satellite gravity, equivalent water height, Chinese mainland, drought and flood events

CLC Number:

P223

MA Wenjing, ZHOU Hao, HE Peipei, ZHENG Lijun, LUO Zhicai. Analysis of terrestrial water storage variations in Chinese mainland based on HUST-Grace2020 model[J]. Acta Geodaetica et Cartographica Sinica, 2023, 52(12): 2089-2102.

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