摘要
根据北京９９ 年６～８ 月的逐日降水资料和２７４ 年６～８ 月总降水量资料， 分析了相当暴雨日数与总降水量及旱涝等级的相关性， 给出相当暴雨日数与总降水量的定量关系式，建立了北京２７４ 年汛期相当暴雨日数资料序列。分析表明： 相当暴雨日数概念的引入，可以把汛期总降水量中暴雨过程降水与非暴雨过程降水分开， 证实汛期旱涝变化只取决于暴雨过程的总次数和强度；相当暴雨日数是一个气候统计量，有与总降水量一致的周期变化，但其年际变率和３．５ 年周期比总降水量更显著，其概率分布满足泊松分布；与旱涝等级比较，相当暴雨日数与总降水量的相关性更好， 且有利于研究形成汛期旱涝灾害的暴雨过程特征。
Based on daily precipitation data of June-August in 99 years and monthly precipitation data in 274 years in Beijing, the correlation of the number of the equivalent torrential rain days and the dryness and wetness grades in the flood season is analysed, the quantitative correlation for the number of the equivalent torrential rain days and the total procipitation of June-August is given The data series of 274 years for the number of the equivalent torrential rain days is built It is seen that the concept for the number of the equivalent torrential rain days can differentiate the precipitation of the torrential rain and the precipitation of the non-torrential rain, and the dryness and wetness change in flood season is determined only by the number and the strength of the torrential rain processes The number of the equivalent torrential rain days is the climatologically statistical quantity It is the same periodic variation with the total procipitation of June-August, but the interannual variability and a 3 5-year periodic for the number of the equivalent torrential rain days are more notable The probability distribution for the number of the equivalent torrential rain days satisfies the Poisson distribution The number of the equivalent torrential rain days can be used to research on the feature of the torrential rain processes of drought and flooding
出处
《大气科学》
CSCD
北大核心
2000年第1期58-66,共9页
Chinese Journal of Atmospheric Sciences
基金
国家 "九五"重中之重项目!96- 908- 05- 02
关键词
早涝
总降水量
相当暴雨日数
气候特征
drought and flooding
total precipitation
number of the equivalent torrential rain days
climatological feature
