梅江流域"24·6"暴雨洪水分析OA

To explore the formation mechanism and hydrological response characteristics of extreme floods in small and medium-sized basins in eastern Guangdong,this study takes the extreme rainstorm flood event that occurred in the Meijiang River Basin from June 16 to 18,2024(referred to as the"24·6"Meijiang River flood event)as the research object.Based on the measured hydrological data(including rainfall,water level,and discharge)from major hydrological stations in the region and long-series historical flood data,the study is conducted from the perspectives of flood causes,historical flood comparison,and frequency analysis.The results show that:①The flood-inducing rainfall of the"24·6"flood presents significant extremeness,characterized by a strong influence of pre-event accumulated rainfall,short rainfall duration,high rainfall intensity,and highly overlapping rainfall areas;②The floods at Xinpu Station(Shiku River)and Baokeng Station(Songyuan River)are the largest measured floods since the stations were established,with their magnitudes exceeding the maximum historically surveyed values,thus being classified as ultra-historical floods;in contrast,the flood at Hengshan(II)Station(Mei River)ranks as the second largest measured flood since the station's construction;③There are obvious regional differences in the recurrence intervals of peak discharges among the control stations.The research results can provide references for extreme flood risk assessment and flood prevention and mitigation efforts in small and medium-sized basins in eastern Guangdong.