Using GRACE/GRACE-FO time variable gravity field data to quantify the characteristics of drought events in the Yangtze River basin

doi:10.13474/j.cnki.11-2246.2022.0139

Abstract

Abstract: Aiming at the problem of accurate quantification the characteristics of regional drought event, a drought event assessment approach based on GRACE/GRACE-FO time variable gravity field is proposed in this paper. And the drought index based on GRACE/GRACE-FO data is validated using traditional drought indices. Finally, this approach is used to detect the drought events that occurred in the Yangtze River basin form April 2002 to December 2020 and quantify the characteristics of these drought events. The results show that the drought index in this paper has good consistent with the traditional drought indices, and there are eight major drought events in the Yangtze River basin during the study period, the most serious of which lasts 23 months from September 2002 to July 2004. The drought severity is -14.07 and an average of 40% of basin area has been affected by drought in this event.

Key words: GRACE/GRACE-FO, Yangtze River, drought event, assessment, drought characteristics

CLC Number:

P208
P23

CUI Lilu, HE Mingrui, ZHANG Cheng, ZOU Zhengbo, WANG Xiaolong. Using GRACE/GRACE-FO time variable gravity field data to quantify the characteristics of drought events in the Yangtze River basin[J]. Bulletin of Surveying and Mapping, 2022, 0(5): 45-48,55.

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