Applicability analysis of monitoring terrestrial water storage changes in the Songliao Basin based on SWARM

doi:10.13474/j.cnki.11-2246.2023.0336

Abstract

Abstract: In view of the gap between GRACE and GRACE-FO satellites and the damage of the satellite accelerator, SWARM satellites monitoring can be used as an effective supplementary means. This paper selects the SWARM time-variable gravities from ASU, IGG and COST-G to monitor the terrestrial water storage changes in the Songliao Basin, and compares them with the GRACE and GRACEE-FO time-variable gravity. The results show that: ①The accuracy of the first 10-degree coefficients of each SWARM time-variable gravities are close to that of the GRACE gravity, and the signal-to-noise ratio of the IGG-SWARM gravity after 1200 km Gaussian filtering is 62.47% and 55.99% higher than that of the ASU and COST-G gravities. ②The IGG-SWARM time-variable gravity can detect the spatiotemporal characteristics of the large-scale terrestrial water storage in the Songliao Basin, and identify the significant drought and flood events. Both the IGG-SWARM and GRACE and GRACE-FO time-variable gravities indicate that the terrestrial water storage shows an overall upward trend from July 2015 to December 2020 in the Songliao Basin, and the correlation coefficients between them can reach more than 0.6 in the data overlap periods. Therefore, SWARM time-variable gravity can be applied to monitor terrestrial water storage changes in the Songliao Basin.

Key words: SWARM, GRACE, GRACE-FO, Songliao Basin, terrestrial water storage

CLC Number:

P237

SUN Weicheng, WEI Dehong, LUO Zhujian, XUAN Jianhao, ZHANG Xingfu. Applicability analysis of monitoring terrestrial water storage changes in the Songliao Basin based on SWARM[J]. Bulletin of Surveying and Mapping, 2023, 0(11): 107-111.

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