“衡邵娄干旱走廊”干旱时空演变特征分析

杨扬, 赵伟明, 胡颖冰, 盛东, 魏永强, 申志高, 谭军

Spatio-temporal evolution characteristics of drought in the “Heng-Shao-Lou drought corridor”

YANG Yang, ZHAO Weiming, HU Yingbing, SHENG Dong, WEI Yongqiang, SHEN Zhigao, TAN Jun

表4 基于不同类型Copula函数的1971—2022年邵阳县干旱事件历时和强度联合分布函数及拟合优度检验

Tab.4 The joint distribution function of duration and severity of drought events based on different types of Copula functions and goodness-of-fit test in Shaoyang County during 1971-2022

Copula函数类型	联合分布函数	θ拟合参数	$d^{2}$
Gumbel-Copula	$e^{- {\{{[- l n H (s)]}^{1 / θ} + {[- l n G (d)]}^{1 / θ}\}}^{θ}}$	2.199 2	0.011
Clayton-Copula	${[H {(s)}^{- θ} + G {(d)}^{- θ} - 1]}^{- 1 / θ}$	2.175 0	0.019
Frank-Copula	$- \frac{1}{θ} l n [1 + \frac{(e^{- θ H (s)} - 1) (e^{- θ G (d)} - 1)}{e^{- θ} - 1}]$	7.215 3	0.018