基于Z指数与SPI的北京市干旱特性分析  

Drought characteristics analysis of Beijing based on Z index and SPI

作　　者：徐晓[1] 宋子亨 刘军梅[1] 赵月芬[1] XU Xiao;SONG Ziheng;LIU Junmei;ZHAO Yuefen(Beijing Institute of Water,Beijing 100048,China;Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430010,China)

机构地区：[1]北京市水利规划设计研究院,北京100048 [2]长江勘测规划设计研究院,武汉430010

出　　处：《北京水务》2018年第6期24-27,共4页Beijing Water

摘　　要：选用北京站作为北京市代表站,根据历年降水量资料分别计算了年降水量的Z指数以及SPI值,对不同方法分别判断了北京站的干旱年份和旱涝等级,结果表明:Z指数方法共识别12年为干旱,其中7年为轻度干旱、 4年为中度干旱、 1年为重度干旱; SPI方法共识别11年为干旱,其中5年为轻度干旱、 6年为中度干旱。Z指数方法对于干旱的识别更为严格,且与调查结果较为一致。In this study,Beijing precipitation station is chosen to analyze its drought characteristics.The Z index and SPI of its yearly precipitation are both calculated.According to the classification scales for Z index and SPI,the selected years in the time scales areclassified as drought or flood and so on.It is concluded that,according to the method of Z index,there are 12 years classified as drought,in which 7years as light drought,4 years as moderate drought and 1year as serious drought;according to SPI method,there are 11 years classified as drought,in which 5 years as light drought and 6 years as moderate drought.This means the method of Z index is stricter than SPI.And this method is more consistent to the investigation result.

关 键 词：干旱特性 Z指数 SPI 旱涝等级 

分 类 号：O242.2[理学—计算数学] TV211.2[理学—数学]