水利水电技术（中英文）

基于江苏省68个雨量站61年(1954~2014年)梅雨期和梅雨量资料进行统计分析,探讨了江淮之间和苏南地区梅雨特征规律。结果表明:(1)江淮之间和苏南地区的多年平均梅雨期为23 d,最长45 d,最短3 d,总体均呈延长趋势。(2)入梅时间南部地区早北部地区迟,总体相差不大。(3)入、出梅日期存在明显的年际变化,近似不规则的正弦波变化,近60年入梅总体有先提前又推迟的趋势;出梅总体呈推迟趋势且1970年代中期以前出梅时间显著早于近30年。(4)两区多年平均梅雨量相当,5年和10年一遇重现期梅雨量基本一致,20年及以上重现期江淮之间梅雨量显著高于苏南。

Based on the statistical analysis made on the data of the periods of plum rain and the amount of plum rain obtained from 68 rain-gauge stations in Jiangsu Province within a period of 61 years( 1954 ~ 2014),the characteristics of the plum rains within the area among the Yangtze-Huaihe Region and the South Jiangsu Area are discussed herein. The result shows that:( 1)the annual average plum rain period within the area among angtze-Huaihe Region and the South Jiangsu Area is 23 d with the longest of 45 d and the shortest os 3d,which shows a prolonged tendency in general.( 2) for the date of the set-in of plum rain period,the southern area is earlyer than that of the northern area and no large difference is there generally.( 3) obvious inter-annual variations are there for both the dates of the set-in of plum rain period and the ending of plum rain season with the approximately irregular variations of sinusoidal wave,while the date of the set-in of plum rain shows a trend of shifting to an earlier date and then postponing later in the recent 60 years. The date of ending of plum rain season presents a gerneral postponing tendency,for which the ending date before the mid 1970 s is obviously earler than the recent 30 years.( 4) the annual averge amounts of plum rain in both the regions are almost the same,while the amounts of the plum rains of 5-year and 10-year return periods are basically identical and the amount of the plum rain with the return period of 20 years or more in the area among the Yangtze-Huaihe Region is obviously larger than that in the South Jiangsu Area.