长江流域汛期候尺度降水量时空集中特征和洪涝关系OACSTPCD

In this study,161 meteorological stations data in the Yangtze River Basin from 1961 to 2020 was used to analyze the Precipitation Concentration Degree(PCD)and Precipitation Concentration Period(PCP)in the Yangtze River Basin during the flood season,and the Mann-Kendall trend analysis and other methods were also used to reveal the spatial and temporal trends and patterns of precipitation in the Yangtze River Basin.The relationship between the concentrated distribution characteristics and patterns of precipitation and the occurrence of floods in the Yangtze River Basin was explored by analyzing the spatial and temporal distribution characteristics of precipitation in flood years.Results indicate that the average PCD at each station in the Yangtze River Basin during the flood years remained between 0.65-0.80,with a noticeable increase in concentration from east to west.The maximum multi-year average of PCP in the Yangtze River Basin showed a lag with Poyang Lake and Dongting Lake Basins and the Sichuan Basin as the centers.In a typical flood year in the Yangtze River Basin,the PCD and PCP have a more pronounced and abnormal distribution compared to normal years,in addition to higher precipitation during the flood season.These findings provide a scientific basis for understanding the relationship between precipitation and the occurrence of floods in the Yangtze River Basin.