基于三种干旱指标的朝阳市干旱特征分析

旱灾具有出现频率高、持续时间长、波及范围广等特点，本文运用降水距平百分率、Z指数、SPI标准化降水指数，对朝阳地区50a（1969～2018）干旱特征进行分析。结果表明：Z指数与SPI标准化降水指标得到的朝阳地区干旱特征情况基本一致，能较好地反映出该地区的干旱特征，朝阳地区1969～2018年自然灾害频繁发生，严重干旱年份主要集中在1980、1981、1982 年，与实际相符。

Analysis on the characteristics of drought with three indexes in Chaoyang city

The drought has the characteristics of high frequency,long duration and wide range.The precipitation anomaly percentage,Z index and SPI standardized precipitation index are used to analyze the drought characteristics of Chaoyang.The results show that the drought characteristics with the Z index and with the SPI standardized percipitation indes are basically the same,which can reflect the local condition.The natural disasters are discovered to be frequent from 1969 to 2018,and severe drought cases are mainly in 1980,1981,and 1982,which is consistent with the local reality.