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Bayissa, Yared A.; Moges, Semu A.; Xuan, Yunqing; Van Andel, Schalk J.; Maskey, Shreedhar; Solomatine, Dimitri P.; Griensven, Ann Van; Tadesse, Tsegaye
Hydrological sciences journal, 11/2015, Letnik: 60, Številka: 11Journal Article
This study investigates the spatial and temporal variation of meteorological droughts in the Upper Blue Nile (UBN) basin in Ethiopia using long historical records (1953-2009) for 14 meteorological stations, and relatively short records (1975-2009) for 23 other stations. The influence of using varying record length on drought category was studied by comparing the Standard Precipitation Index (SPI) results from the 14 stations with long record length, by taking out incrementally 1-year records from 1953 to 1975. These analyses show that the record length from 1953 to 1975 has limited effect on changing the drought category and hence the record length from 1975 to 2009 could be used for drought analysis in the UBN basin. Spatio-temporal analyses of the SPI values show that throughout the UBN basin seasonal or annual meteorological drought episodes occurred in the years 1978/79, 1984/85, 1994/95 and 2003/04. Persistency from seasonal to annual drought, and from one year to the next, has been found. The drought years identified by this SPI analysis for the UBN basin are known for their devastating impact in other parts of Ethiopia. Editor Z.W. Kundzewicz; Guest editor D. Hughes
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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