Study on the Concentration of Annual Seasonal Precipitation in Henan Province
Henan Province is located in the Central Plains region,spanning four major river basins,namely,the Haihe River,the Yellow River,the Huaihe River and the Yangtze River.The study of its precipitation time uniformity character-istics is of great significance to the province's water resources dynamic management and drought and flood disaster defense.Taking Henan Province as the research object,this paper analyzes the temporal uniformity characteristics and change fea-tures of precipitation in the province based on the long series of precipitation data from 1956 to 2021 at 522 rainfall stations,using the indicators of precipitation concentration index PCI and precipitation concentration Q,supplemented by Kriging spatial interpolation and other methods.The results are as follows.The uniform characteristics of precipitation time in Henan Province are characterized by regional variability,with the distribution of precipitation time in the north being more concentrated,and that in the south being more uniform,with the degree of concentration generally decreasing from north to south.The multi-year trend in the temporal uniformity of precipitation characteristics is small,with a slight tendency toward concentration,except in northeastern Henan Province and parts of the northwestern part of the provincially-administered Huaihe River Basin.Precipitation time uniformity characteristics have some positive but very weak correlation with precipi-tation and meteorological drought.Therefore,precipitation time uniformity should be considered as an independent factor when studying drought and flood events.
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