Discussion on the characteristics and risk management strategies of abnormal rainfall-flood regime in the Hanjiang River Basin during the autumn flood season of 2021

The Hanjiang River during the autumn flood season of 2021 encountered the serious flood event with a return period of more than 20 years,where both the accumulated precipitation in the upper reaches of Hanjiang River and the accumulated inflow in Danjiangkou Reservoir broke their history records. It is a major challenge for meteorological departments to do a good job in their support services. Based on the summary of abnormal rainfall-flood characteristics and the review of meteorological support service process in the Hanjiang River Basin during the autumn flood season of 2021, this study points out some problems in the meteorological support services for the autumn flood in the basin in 2021. In addition,this study also proposes several risk management strategies to improve continuously the quality and efficiency of meteorological support services. These strategies can provide a reference for providing better meteorological support services of Hanjiang River in the autumn flood season in the future.