基于最优分割和大尺度天气系统分析的宿州降水阶段划分

为科学划分降水阶段，有效利用降水时空特征划分水库汛期和确定干旱识别时段起讫日期，克服以日、月、季降水量为指标进行划分的不足，采用最优分割法和大尺度天气系统分析相结合的方法，对宿州多年平均日降水序列进行阶段划分。 识别出 6 个阶段日均降水量分别为 2.09，4.72，8.13，6.05，2.66，0.97 mm，阶段降水量具有显著差异。 该方法划分的降水阶段可为宿州市区域水库汛期划分、干旱识别中的时段起讫日期确定提供科学依据，为类似地区的水库汛期划分和干旱识别提供一种新思路。

Precipitation stage division in Suzhou City based on optimal segmentation and analysis of large-scale weather system

To scientifically divide the stage of precipitation,we can effectively use spatiotemporal features of precipitation to divide the flood season of the reservoir and determine the start and end dates of the drought identification period. To overcome the shortcomings of dividing the stage of precipitation based on daily, monthly and seasonal as indicators, we used a combination method of optimal segmentation and large-scale weather system analysis to divide the stage on the multi-year average daily precipitation series in Suzhou City.The average daily precipitation in the six stages was identified as 2.09, 4.72, 8.13, 6.05, 2.66, and 0.97 mm, respectively, and there were significant differences in the stage precipitation. The precipitation stages divided by this method can provide a scientific basis for the division of the flood season of regional reservoirs in Suzhou City and the determination of the start and end dates of the period in drought identification, and provide a new idea for the flood season division and drought identification of reservoirs in similar areas.