中文摘要：

由1961—2000年合肥市每月的气温和降水数据得到干旱指数SPEI,从年、季尺度分析SPEI指数与ENSO事件的关系,揭示ENSO对合肥市旱涝灾害的影响。结果表明：（1）在40 a的研究期间共发生ENSO事件19次,暖事件的频次大于冷事件;（2）合肥市的旱灾和涝灾主要发生在ENSO事件年的当年、次年或前一年,其中在6个干旱年中,3 a发生在El Nino强事件年,5个涝年中,有3 a发生在La Nina强事件年;（3）ENSO事件强度与合肥市年SPEI指数呈显著负相关关系,滞后2个月最为显著,El Nino事件年合肥市发生旱灾的概率较大,而La Nina事件年发生涝灾的概率较大;（4）合肥市旱涝灾害以春夏季节居多,灾害强度以中度旱涝灾害为主,且旱灾强度比涝灾强度大,秋、冬季节恰好相反。

英文摘要：

Drought index SPEI was obtained by the Hefei city from 1961 to 2000 monthly temperature and precipitation data, from the annual and seasonal scale analysis SPEI index and ENSO events, reveal the influence of ENSO on drought and flood disasters in Hefei city. The results showed that： （1）During the 40 year study period a total of 19 ENSO events, the frequency of warm events than cold events. （2）In Hefei City, the drought and waterlogging occurs mainly in ENSO years year, next year or the year before, which in the six years of drought, 3 years occurred in the year of the strong El Nino event, the five flood years, 3 years occurred in the years of strong La Nina events. （3）The strength of ENSO events and Hefei in SPEI index showed significant negative correlation, the lag of 2 months is the most significant, in Hefei city of El Nino events occurred drought greater probability, and La Nina events occurred in the floods in the probability of a larger. （4）Of drought and flood disasters in Hefei City in spring and summer season is in the majority, to moderate drought and flood disaster intensity, and drought intensity than logging intensity big; autumn and winter just the opposite.