CHARACTERIZATION OF THE DROUGHT BY THE SPI AND SPEI INDICES IN THE WEST CENTER OF CÔTE D'IVOIRE CASE OF THE LOBO BASIN

V.H. N’GUESSAN BI, T.T ADJAKPA, F.B. ALLECHY, M. YOUAN TA, Y.F. ASSA, K. AFFIAN

Abstract


The drought observed since 1970 in Côte d'Ivoire has often had tragic consequences on water resources, the agricultural sector and the environment. The objective of this study is to characterize the meteorological drought in the Lobo River Basin with a view to raising the awareness of the population in order to take adequate adaptation measures. The method used is based on the calculation of the SPI (Standardized Precipitation Index) and SPEI (Standardized Precipitation and Evapotranspiration Index) at different time scales (3, 6 and 12 months) over the period 1979 to 2013. The results show that the entire Lobo watershed experienced a moderate type of drought, the most remarkable by their intensity and duration being recorded during the periods from 2000 to 2002 and 2005 to 2007. These drought periods were longer in the northern half of the basin according to the two indices on 3 and 6 months’ time scales and longer in the extreme south of the watershed on a 12 months time scale. Drought was more slightly felt in the extreme southern half of the watershed than in the northern half of the Lobo watershed.


Keywords


characterization, drought, Lobo watershed, indices SPEI and SPI

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