基于最优概率分布函数的成都市近63 a干旱特征分析
任至涵, 倪长健, 石荞语, 陈宁

Analysis of drought characteristics in Chengdu over the past 63 years based on the optimal probability distribution function
REN Zhihan, NI Changjian, SHI Qiaoyu, CHEN Ning
表1 基于标准降水指数的干旱等级划分标准
Tab.1 The classification standard of drought grades based on SPI
干旱强度 类型 标准降水指数(SPI)
0 无旱 -0.5<SP1
1 轻旱 -1.0<SPI≤-0.5
2 中旱 -1.5<SPI≤-1.0
3 重旱 -2.0<SPI≤-1.5
4 特旱 SPI≤-2.0