LARHYSS Journal
Volume 18, Numéro 1, Pages 169-179
2021-03-31

Consequences Of The Effects Of Climate Change On Water Resources In A Humic Tropical Zone Of Central Eastern Côte D’ivoire

Authors : Assemian Assiè Emile . Dje Bi Doutin Serge . Samake Yacouba .

Abstract

ABSTRACT This study aims to show the impacts of global warming on water resources in the department of Bocanda, located in the central-eastern part of Côte d'Ivoire, in a humid tropical environment. What are the periods of climate change in this locality? Thus, the Pettitt test was applied to the climatic series from 1920 to 2009 of the Bocanda station. This test shows a unique break in the rainfall series in 1968. Thus, a wet period of low temperatures can be distinguished, from 1920 to 1968, where the annual rainfall is abundant, with an annual average of 1270.14 mm. There is also a dry period, from 1969 to 2009, with low rainfall, with an annual average value of 1145.4 mm, and almost all high temperatures. These temperatures increased by 0.60°C on annual average during the dry period and the rate of reduction in rainfall is 10.01% on annual average. It is therefore a case of global warming in this humid tropical environment which results in a decrease in rainfall. The water balance method has made it possible to highlight the impacts of this global warming on the region's water resources. The results show that, in wet periods, real evapotranspiration, which was on average 905.46 mm per year according to Coutagne's method, is reduced to 852.74 mm in dry periods, a reduction of 5.82%. Annual average runoff, which was 87.63 mm in the wet period, is reduced to 79 mm in the dry period, a reduction of 9.0%. Finally, the effective infiltration in wet period is 277.04 mm, which is reduced by 22.88% in dry period.

Keywords

Climate change, water resources, Côte d’Ivoire