商丘相当暴雨日数的气候特征

利用商丘1961-2005年6-8月的逐日降水资料和总降水量资料,分析了相当暴雨日数与总降水量及降水等级的相关性,结果表明: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;相当暴雨日数是一个气候统计量,其年际变率比总降水量更显著;与降水等级比较,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洪涝灾害的暴雨过程特征。

Climatic Characteristic of Equivalent Rainstorm Day in Shangqiu

Using daily precipitation data and total precipitation from June to August during 1961-2005,we discuss the relevance between equivalent rainstorm day and total precipitation,precipitation grade.Results show introducing the concept of equivalent rainstorm day can divide total precipitation of the flood season between rainstorm process precipitation and non-rainstorm process precipitation.The equivalent rainstorm day is a climatological statistic,and its interannual variability is more obvious than total precipitation.There is more close relevance between equivalent rainstorm day and total precipitation as opposed to precipitation grade,which is favorable for research on rainstorm process characteristic forming flood season disaster.