Abstract:Based on GRACE and GRACE-FO gravity satellite data, we use the moving T-test technique to determine the characteristic time point of the mutation of terrestrial water storage in the Haihe river basin, and analyze its spatiotemporal evolution characteristics. Combining multivariate trend analysis and contribution rate quantification method, we explore the causes of terrestrial water storage changes in the basin, and discuss the contribution of the south-to-north water diversion project. The results show that before (from January 2004 to January 2015) and after (from January 2015 to October 2020) the south-to-north water diversion project, the decline trends of terrestrial water storage in the Haihe river basin are -17.19 mm/a and -13.49 mm/a, respectively, relieved by about 24%, and the mitigation trend gradually increases from south to north. The ratio of contribution rate of human activities and climate change to the terrestrial water storage changes in the basin is 7∶3, anthropogenic water consumption is the main reason for the loss of water storage in the Haihe river basin all year round. The contribution rate and trend of the water transfer volume show a state of increasing and rising in the annual, indicating that the south-to-north water diversion project has great potential in improving regional terrestrial water storage.
NIE Shengkun,YIN Wenjie,ZHENG Wei et al. Analysis of Terrestrial Water Storage Changes in the Haihe River Basin before and after the South-to-North Water Diversion Project[J]. jgg, 2023, 43(2): 128-134.