3 research outputs found
VariabilitĂ© PluviomĂ©trique Dans La RĂ©gion De Katiola Au Nord De La CĂŽte Dâivoire (Afrique De lâOuest)
Lâobjectif de cette Ă©tude est de mettre en Ă©vidence, la variabilitĂ© dans les sĂ©ries pluviomĂ©triques de la rĂ©gion de Katiola, situĂ©e au nord de la CĂŽte dâIvoire. Pour ce faire, des donnĂ©es de pluviomĂ©trie couvrant la pĂ©riode de 1949 Ă 2013 ont Ă©tĂ© utilisĂ©es. La mĂ©thodologie adoptĂ©e est basĂ©e sur le calcul de lâindice pluviomĂ©trique de Nicholson, et des tests statistiques de dĂ©tection des ruptures et tendance (test de Pettitt, test de tendance de MannâKendall). Les rĂ©sultats obtenus indiquent que sur la pĂ©riode dĂ©terminĂ©e, les hauteurs pluviomĂ©triques annuelles oscillent entre 550 et 2000 mm avec une valeur moyenne annuelle dâenviron 1107 mm. Lâanalyse du graphe de variation de lâindice pluviomĂ©trique de Nicholson, met en Ă©vidence lâexistence de deux sous-pĂ©riodes. Dâune part, une sous-pĂ©riode humide de 1949 Ă 1968 avec un excĂ©dent pluviomĂ©trique de 13,16% par rapport Ă la moyenne et dâautre part, une sous-pĂ©riode sĂšche de 1969 Ă 2013, marquĂ©e par les indices pluviomĂ©triques les plus nĂ©gatifs avec un dĂ©ficit de 7,13%. La MĂ©thode du test statistique de Pettitt appliquĂ©e Ă la sĂ©rie chronologique rĂ©vĂšle une rupture Ă partir de lâannĂ©e 1968. Les rĂ©sultats obtenus confirment donc lâexistence de variabilitĂ© et de rupture dans les sĂ©ries pluviomĂ©triques de la rĂ©gion de Katiola depuis la fin des annĂ©es 1960.
The aim of this study is to highlight variability and breaks in the rainfall series from Katiola region located in the North part of CĂŽte d'Ivoire. For the purposes of this study, rainfall data during 1946 to 2013 period were used. The methodology is based on the calculation of Nicholsonâs rainfall index and statistical tests of breaks detected and for trend (Pettittâs test and Mann Kendallâs test). The results obtained indicate that annual rainfall height varied between 550 and 2000 mm with a mean value of 1107 mm. Analysis of the variation curve of the pluviometry index shows two sub-periods, a wet sub-period from 1949 to 1968 with a rainfall excess of 13.16% compared to the average, and a dry sub-period from 1969 to 2013 with most negative rainfall index and a deficit 7.13%. Pettitt statistical tests applied to rainfall time series reveals a break from the year 1968 onwards. The results obtained confirm the existence of variability and break in rainfall series from Katiola region, since the end of 1960s year
ANALYSE DE LA PRODUCTIVITĂ DES AQUIFĂRES DE FISSURES DU SOCLE PALĂOPROTĂROZOĂQUE DE LA RĂGION DE KATIOLA (CENTRE-NORD DE LA CĂTE DâIVOIRE)
In the area of Katiola, the main part of groundwater resources is contained in the discontinuous aquifers of the paleoproterozoïc base.This study relates to the analysis of the productivity of the aquifers fissured of the area starting from an approach which takes into account the comparative analysis carried out on the one hand with the flows and physical parameters, flows and lithology, flows and transmissivity and, on the other hand an ACPN of these parameters.The various results contribute to known the hydrogeological potentialities of the area of Katiola. The depths most productive meets between 30 and 75 m. The section from 20 to 50 m of weathered material offer the best flows.67% of the flows met in the area are weak, that can be charged to the lack of studies before the establishment of the works.The most productive AE are located in the first 35 meters under the base of altérites.The schists are more productive than the granite