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在总结对比已有气象干旱指数的基础上,结合帕默尔干旱指数(PDSI)和标准化降水指数(SPI)的优点,提出综合气象干旱指数DI,并对综合气象干旱指数与区域干旱受旱/成灾面积和径流丰枯的相互关系进行分析,结果表明:综合气象干旱指数能够较好地反映区域干旱受旱/成灾范围,以及河道径流的丰枯状况。并且综合气象干旱指数还同时考虑了月季降水量的异常和一段时间的水分亏缺,比单个气象干旱指数更能反映农业干旱和水文干旱。
On the basis of summarizing and contrasting the existing meteorological drought indices and combining the merits of PDMI and SPI, the paper presents a comprehensive meteorological drought index DI and analyzes the relationship between the integrated meteorological drought index and regional drought and drought / The results showed that the comprehensive meteorological drought index could well reflect the range of drought and disaster in the region and the abundance and fluence of the river runoff. Moreover, the integrated meteorological drought index also considers the anomalies of the monthly precipitation and the water deficit over a period of time, which can better reflect the agricultural and hydrological droughts than the single meteorological drought index.