ANALYSIS OF FLOOD CHARACTERISTICS OF YANGTZE RIVER BASIN IN 2020 USING SATELLITE OBSERVATIONS

抄録

 In summer 2020, southern China was subjected to continuous heavy rainfall and the Yangtze river basin suffered severe flood damage. Understanding the causes and characteristics of major floods (including the 2020 floods) will greatly aid future flood management strategies. We analyzed the 2020 Yangtze river basin floods; satellite observations provided spatial and temporal rainfall, surface wetness, and flooding data. CHIRPS data from rain gauges and satellite observations were analyzed in terms of spatial distribution of intensity and amount of rainfall. The normalized difference frequency index (NDFI), derived via passive microwave remote-sensing, revealed the extent of surface wetness and flooding. The results of the analysis revealed that 1) high intensity of rainfall was observed mainly in Min and Jialing river basin in upstream, and higher anomalies of total rainfall was observed in both upstream and downstream 2) higher values of NDFI anomalies were widely distributed not only on the downstream but also on upstream 3) relatively larger anomalies of NDFI was found more on upstream in 2020.