Influence of Terrestrial Water Storage on Flood Potential Index in the Yangtze River Basin, China

In a changing environment, changes in terrestrial water storage (TWS) basins have significant impact on potential floods and affect flood risk assessment. Therefore, we aimed to study the of TWS floods. this study, reconstructed based precipitation temperature, evaluated data Gravity Recovery Climate Experiment (GRACE)-TWS data, analyzed calculated index (FPI) Yangtze River Basin (YRB). The related influencing factors were Global Land Data Assimilation System (GLDAS) Granger’s causality test. main conclusions are as follows: (1) although GRACE-TWS anomaly (GRACE-TWSA) YRB showed an increasing trend for averaged TWSA over all grids whole basin (i.e., 0.31 cm/a, p < 0.05), variable infiltration capacity-soil moisture anomalies (VIC-SMA) decreasing −0.048 > 0.05) during April 2002–December 2019; (2) larger relative contribution detrended FPI was found Jialingjiang (JRB), Wujiang (WRB), Dongting Lake Rivers (DLRB), YinBin-Yichang reaches (YB-YC), Yichang-Hukou (YC-HK), while Poyang (PLRB) than that other basins; (3) original soil (SM) positive correlation (p effect SM caused change its sub-basins. This is great significance correct understanding accurate assessment risk.