两种气象干旱指标的应用比较研究  

Application and Comparison of Two Meteorological Drought Indices

作　　者：韩继伟[1] 孔凡哲[1] 赵磊[1] 宋晓猛[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《中国农村水利水电》2012年第1期85-88,共4页China Rural Water and Hydropower

基　　金：国家自然科学基金资助项目(50309002)

摘　　要：基于两种常用的气象干旱指标计算方法———Z指数和标准化降水指数(SPI指数),改进了两种干旱指标的区域化计算方法。通过比较分析两种不同干旱指标方法,结果表明SPI指数与Z指数具有较好的一致性。同时,SPI指数计算较Z指数简单,资料容易获取,其借助概率密度函数转化计算,消除了降水资料的时空分布差异,具有良好的稳定性,能有效地反映区域的旱涝状况,为区域水资源评估及旱涝灾害预测预警提供了可靠的依据。The standardized precipitation index （SPI） and Z-index are two important methods to assess meteorological drought severity. The improved method of the two indices are proposed and used in this study. The comparative results of the two methods demonstrate that the SPI index is greatly consistent with the Z-index. However, the SPI index has excellent stability of computation, and it rarely relates to distributing on precipitation, avoiding some of the irregularities associated with the Z-index, that is, the SPI in dex is superior to the Z-index in its application.

关 键 词：干旱指标 Z指数 SPI指数 一致性 稳定性 

分 类 号：S162.1[农业科学—农业气象学]