Frequent drought‐flood abrupt alternation (DFAA) events in the Yangtze River Basin (YRB), characterized by complex formation mechanisms and limited predictability, pose a prominent challenge in climate research. A daily‐scale DFAA index is developed to enhance event identification accuracy by coupling dual signals from precipitation and soil moisture in this study. The selected 86 DFAA events from 1961–2023 are classified into...

The middle and lower reaches of the Yangtze River Basin (MLYRB) are prone to Rapid Flood‐Drought Transition (RFDT) due to uneven spatiotemporal distribution of precipitation. In recent decades, such events have shown a marked interdecadal increase, posing serious threats to disaster prevention and mitigation. To reveal the interdecadal characteristics and underlying physical mechanisms, this study employs the daily standardise...