Wu H,Hayes M J,Weiss A,et al.An evaluation of the standardized precipitation index,the China-Z index and the statistical Z-score〔J〕.International Journal of Climatology,2001,21:745-758.
Guttman N B.Comparing the Palmer drought index and the standardized precipitation index〔J〕.Journal of the American Water Resources Association,1998,34(1):113-121.
[12]
Guttman N B.Accepting the standardized precipitation index:A calculation algorithm〔J〕.Journal of the American Water Resources Association,1999,35(2):311-322.
[13]
LloydHughes B,Saunders M A.A drought climatology for Europe〔J〕.International Journal of Climatology,2002,22:1 571-1 592.
[14]
Bonaccorso B,Bordi I,Cancelliere A,et al.Spatial variability of drought:An analysis of the [WTBX]SPI[WTBZ] in sicily〔J〕.Water Resources Management,2003,17:273-296.
[15]
Sonmez F K,Komüscü A u,Erkan A,et al.An analysis of spatial and temporal dimension of drought vulnerability in Turkey using the standardized precipitation index〔J〕.Natural Hazards,2005,35:243-264.
[16]
Mishra A K,Desai V R.Drought forecasting using stochastic models〔J〕.Stochastic Environmental Research and Risk Assessment,2005,19:326-339.
[17]
Livida I,Assimakopoulos V D.Spatial and temporal analysis of drought in Greece using the standardized precipitation index (SPI)〔J〕.Theoretical and Applied Climatology,2007,89:143-153.
