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Analysis of Droughts and Floods Evolution and Teleconnection Factors in the Yangtze River Basin Based on GRACE/GFO

Ren, Ruqing, Nemoto, Tatsuya, Raghavan, Venkatesh, Song, Xianfeng, and Duan, Zheng, 2025. Analysis of Droughts and Floods Evolution and Teleconnection Factors in the Yangtze River Basin Based on GRACE/GFO. Remote Sensing, 17(14):2344, doi:10.3390/rs17142344.

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@ARTICLE{2025RemS...17.2344R,
       author = {{Ren}, Ruqing and {Nemoto}, Tatsuya and {Raghavan}, Venkatesh and {Song}, Xianfeng and {Duan}, Zheng},
        title = "{Analysis of Droughts and Floods Evolution and Teleconnection Factors in the Yangtze River Basin Based on GRACE/GFO}",
      journal = {Remote Sensing},
     keywords = {GRACE/GFO, drought and flood, water storage, teleconnection factors, sub-basins},
         year = 2025,
        month = jul,
       volume = {17},
       number = {14},
          eid = {2344},
        pages = {2344},
     abstract = "{In recent years, under the influence of climate change and human
        activities, droughts and floods have occurred frequently in the
        Yangtze River Basin (YRB), seriously threatening socioeconomic
        development and ecological security. The topography and climate
        of the YRB are complex, so it is crucial to develop appropriate
        drought and flood policies based on the drought and flood
        characteristics of different sub-basins. This study calculated
        the water storage deficit index (WSDI) based on the Gravity
        Recovery and Climate Experiment (GRACE) and GRACE-Follow On
        (GFO) mascon model, extended WSDI to the bidirectional
        monitoring of droughts and floods in the YRB, and verified the
        reliability of WSDI in monitoring hydrological events through
        historical documented events. Combined with the wavelet method,
        it revealed the heterogeneity of climate responses in the three
        sub-basins of the upper, middle, and lower reaches. The results
        showed the following. (1) Compared and verified with the
        Standardized Precipitation Evapotranspiration Index (SPEI),
        self-calibrating Palmer Drought Severity Index (scPDSI), and
        documented events, WSDI overcame the limitations of traditional
        indices and had higher reliability. A total of 21 drought events
        and 18 flood events were identified in the three sub-basins,
        with the lowest frequency of drought and flood events in the
        upper reaches. (2) Most areas of the YRB showed different
        degrees of wetting on the monthly and seasonal scales, and the
        slowest trend of wetting was in the lower reaches of the YRB.
        (3) The degree of influence of teleconnection factors in the
        upper, middle, and lower reaches of the YRB had gradually
        increased over time, and, in particular, El Ni{\~n}o Southern
        Oscillation (ENSO) had a significant impact on the droughts and
        floods. This study provided a new basis for the early warning of
        droughts and floods in different sub-basins of the YRB.}",
          doi = {10.3390/rs17142344},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2025RemS...17.2344R},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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