___

• Keyantash, J. A., Dracup, J. A., “An Aggregate
• Drought Index: Assessing Drought Severity
• Based on Fluctuations in the Hydrologic Cycle
• and Surface Water Storage”, Water Resources
• Research, 40, W09304, 2004.
• McKee, T.B., Dosken, N.J., Kleist, J., “The
• relationship of drought frequency and duration to
• time scales”, Eight Conference on Applied
• Climatology, 17-22 January, Anaheim,
• California. 179-184, 1993.
• Dracup, J.A., Lee,K.S., Paulson, E.G., “On the
• definition of droughts”, Water Resources
• Research, 16, 297-302, 1980.
• Mishra, A., Singh, A.P., “A review of drought
• concepts”, Journal of Hydrology, 391, 202-216,
• -
• Bryat, E.A., Natural Hazards, Cambridge
• University Press, Cambridge, 1991.
• Awass, A.A., “Hydrological Drought Analysisoccurrence,
• severity, risks: the case of Wabi
• Shebele River Basin, Ethiopia”, PhD. Thesis,
• Universitat Siegen, 2009.
• Barua, S., Perera, B.J.C., Ng, A.W.M., “A
• comparative drought assessment of Yarra River
• Catchment in Victoria, Australia”, 18th World
• IMACS / MODSIM Congress, Cairns, Australia
• -17 July 2009.
• Keskin F., Şorman A.Ü., “Assessment of the dry
• and wet period severity with hydrometeorological
• index”, International Journal of Water
• Resources and Environmental
• Engineering,Cilt 2 (2), 29–39, 2010.
• Labedzki, L., “Estimation of Local Drought
• Frequency in Central Poland Using The
• Standardized Precipitation Index SPI”, Irrigation
• and Drainage, 56, 67-77, 2007.
• Fleig, A., Tallaksen, L.M., Hisdal, H., “Drought
• Indices Suitable to study the linkage to large
• scale climate drivers in regions with seasonal
• frost influence, Proceedings of the Fifth
• FRIEND World Conference held at Havana,
• Cuba, November 2006, IAHS Publ. 308, pp:
• -174. in: Climate variability and change-
• Hydrological Impacts, ed. Demuth, S., IAHS
• publications 308, 2006.
• Szalai, S., Szinell, C., Zoboki, J., Drought
• monitoring in Hungary, in: Early warning
• systems for drought preparedness and
• drought management World Meteorological
• Organization, Lisboa, 2000.
• Hayes, M.J., Svoboda, M.D., Wilhite, D.A.,
• Vanyarkho, O.V., “Monitoring the 1996 drought
• using the standardized precipitation index”, Bull.
• Am. Meteorol. Soc., 80(2),429-438, 1999.
• Wu, H., Hayes, M.J.,Weiss, A., Hu, Q., “An
• evaluation of the standardized precipitation
• index, the china-Z index and the statistical Zscore”
• Int. Journal of Climatology, 21, 745-
• , 2001.