北方半干旱区的PDSI和SPI比较研究  

Comparative Study on PDSI and SPI in the Semi-arid Region of Northern China

作　　者：陈才 王振亚 程媛华[3] 刘晓帆[4] 徐静[1] 

机构地区：[1]广东科诺电力岩土工程有限公司,广东广州510600 [2]河南省气象台,河南郑州450003 [3]水利部太湖流域管理局,上海200434 [4]四川省交通厅交通勘察设计研究院,四川成都610017

出　　处：《安徽农业科学》2012年第5期2778-2780,2856,共4页Journal of Anhui Agricultural Sciences

基　　金：中央高校基本科研业务费专项资金(1117020601);国家水体污染控制与治理科技重大专项(2009ZX07210-004-04)

摘　　要：以北方半干旱地区老哈河流域为研究区域,利用流域内及其周边15个气象站1957～2008年的长序列日观测资料,计算逐月的帕默尔干旱指标(Palmer Drought Severity Index,PDSI)和不同时间尺度(1、3、6及12月)的标准化降水指标(Standard Precipitation Index,SPI)。结果表明,52年间分别有6段主要的湿润期和干旱期,持续时间都在1年以上,说明老哈河流域旱涝持续性较强。将不同时间尺度的SPI与PDSI进行对比发现,随着时间尺度的增大,SPI对干旱持续性的表现能力增强,12个月时间尺度的SPI与PDSI一致性较好。With Laohahe River Basin which lies in the semi-arid region of northern China as the study area,the monthly PDSI（Palmer Drought Severity Index） and SPI（Standard Precipitation Index） at different time scale（Jan.,Mar.,Jun.,Dec.） were calculated based on the daily records of 15 weather stations in and around the study basin.The results showed that six dry periods and six wet periods appears in last 52 years and the duration of each was longer than 1 year.The drought and wetness in the Laohahe River Basin were strongly durative.When compared the PDSI with the SPI at different time scale,it was found that the SPI of larger time scale was capable of capturing the continuity of drought and the 12-month SPI agreed well with the PDSI.

关 键 词：干旱 SPI PDSI 北方半干旱区 

分 类 号：S423[农业科学—植物保护]