Spatio-Temporal Analyses of Rainfall Extremes by Climatic Indices Method in Marahoué Region (Central West of Côte D’ivoire)

Authors : YAPI Assa Fabrice; OGA Yeï Marie Solange; KPAN Oulaï Jean Gautier; N’GUESSAN BI Vami Hermann; ALLECHY Fabrice Blanchard; et BIEMI Jean

Volume/Issue : Volume 5 - 2020, Issue 11 - November

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- The objective in this work is to carry out a spatio-temporal study of extreme rainfall events from daily observations from the Center for Climate Prediction System Reanalysis (CFSR) by the method of climatic indices on the chronicle from 1980 to 2013 using the CLimPACT 2 master program which was used to calculate the climatic indices used in this work namely the annual total rainfall (PRCPTOT), daily rainfall intensity (SDII), annual total rainfall on very wet days (R95p), percentage of annual total rainfall on very wet days (R95pTOT), annual total rainfall on extremely wet days (R99p) and percentage of annual total rainfall on extremely wet days R99pTOT. The values of these climate indices obtained were spatialized and grouped into three 10-year periods for each climate index. Over the entire study period, the cumulative annual rainfall amounts vary from 1094.14 mm to 2012.98 mm with an average water depth ranging from 5.96 mm/d to 8.93 mm/d. Cumulative intense rainfall varies from 226.87 mm to 692.40 mm with a frequency of intense rainfall between 14.30% and 33.65%. The cumulative extreme rainfall amounts are between 67.34 mm and 295.50 mm with a frequency of extreme rainfall that varies between 4.82% and 15.09%. A gradual decline was observed in all the rainfall indicators used, reflecting the occurrence of droughts in the Marahoué region.

Keywords : Climate Indices, Extreme Rainfall, Marahoué, Côte d'Ivoire


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